Chemistry › Organic Chemistry

Nanomaterials for catalytic reactions

Works Count: 41017

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This cluster of papers focuses on the catalytic reduction and hydrogenation of nitro compounds using metal nanoparticles, supported catalysts, and green synthesis methods. It explores chemoselective reactions, selective hydrogenation processes, and the environmental applications of these catalytic systems.

Keywords

Catalytic Reduction; Nitro Compounds; Metal Nanoparticles; Hydrogenation; Chemoselective; Supported Catalysts; Green Synthesis; Selective Hydrogenation; Nanocomposites; Environmental Catalysis

Core–shell nanoparticles: synthesis and applications in catalysis and electrocatalysis

2015-01-01

Manoj B. Gawande , Anandarup Goswami , Tewodros Asefa +5 more

Core–shell nanoparticles (CSNs) are a class of nanostructured materials that have recently received increased attention owing to their interesting properties and broad range of applications in catalysis, biology, materials chemistry … Core–shell nanoparticles (CSNs) are a class of nanostructured materials that have recently received increased attention owing to their interesting properties and broad range of applications in catalysis, biology, materials chemistry and sensors. By rationally tuning the cores as well as the shells of such materials, a range of core–shell nanoparticles can be produced with tailorable properties that can play important roles in various catalytic processes and offer sustainable solutions to current energy problems. Various synthetic methods for preparing different classes of CSNs, including the Stöber method, solvothermal method, one-pot synthetic method involving surfactants, etc., are briefly mentioned here. The roles of various classes of CSNs are exemplified for both catalytic and electrocatalytic applications, including oxidation, reduction, coupling reactions, etc.

Supported metal nanoparticles on porous materials. Methods and applications

2008-12-18

Robin J. White , Rafael Luque , Vitaliy L. Budarin +2 more

Nanoparticles are regarded as a major step forward to achieving the miniaturisation and nanoscaling effects and properties that have been utilised by nature for millions of years. The chemist is … Nanoparticles are regarded as a major step forward to achieving the miniaturisation and nanoscaling effects and properties that have been utilised by nature for millions of years. The chemist is no longer observing and describing the behaviour of matter but is now able to manipulate and produce new types of materials with specific desired physicochemical characteristics. Such materials are receiving extensive attention across a broad range of research disciplines. The fusion between nanoparticle and nanoporous materials technology represents one of the most interesting of these rapidly expanding areas. The harnessing of nanoscale activity and selectivity, potentially provides extremely efficient catalytic materials for the production of commodity chemicals, and energy needed for a future sustainable society. In this tutorial review, we present an introduction to the field of supported metal nanoparticles (SMNPs) on porous materials, focusing on their preparation and applications in different areas.

Removal of methylene blue from aqueous solution by a solvothermal-synthesized graphene/magnetite composite

2011-07-24

Lunhong Ai , Chunying Zhang , Zhonglan Chen

Silver nanoparticle catalyzed reduction of aromatic nitro compounds

2002-01-01

Narayan C. Pradhan , Anjali Pal , Tarasankar Pal

Carbons as supports for industrial precious metal catalysts

1998-10-01

Emmanuel Auer , Andreas Freund , Jörg Pietsch +1 more

Supported gold nanoparticles as catalysts for organic reactions

2008-01-01

Avelino Corma , Hermenegildo Garcı́a

This critical review is intended to attract the interest of organic chemists and researchers on green and sustainable chemistry on the catalytic activity of supported gold nanoparticles in organic transformations. … This critical review is intended to attract the interest of organic chemists and researchers on green and sustainable chemistry on the catalytic activity of supported gold nanoparticles in organic transformations. In the general part of this critical review, emphasis is given to the different procedures to form supported gold nanoparticles and to the importance of the support cooperating in the catalysis. Also the convergence of homogeneous and heterogeneous catalysis in the study of gold nanoparticles has been discussed. The core part of this review is constituted by sections in which the reactions catalyzed by supported gold nanoparticles are described. Special emphasis is made on the unique ability of gold catalysts to promote additions to multiple C-C bonds, benzannulations and alcohol oxidation by oxygen (282 references).

Photochemical Green Synthesis of Calcium-Alginate-Stabilized Ag and Au Nanoparticles and Their Catalytic Application to 4-Nitrophenol Reduction

2009-12-03

Sandip Saha , Anjali Pal , Subrata Kundu +2 more

Silver and gold nanoparticles have been grown on calcium alginate gel beads using a green photochemical approach. The gel served as both a reductant and a stabilizer. The nanoparticles were … Silver and gold nanoparticles have been grown on calcium alginate gel beads using a green photochemical approach. The gel served as both a reductant and a stabilizer. The nanoparticles were characterized using UV-visible spectroscopy, X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), energy dispersive X-ray (EDS), and selected area electron diffraction (SAED) analyses. The particles are spherical, crystalline, and the size ranges for both Ag and Au nanoparticles are <10 nm. It is noticed from the sorption experiment that the loading of gold on calcium alginate beads is much more compared to that of Ag. The effectiveness of the as-prepared dried alginate-stabilized Ag and Au nanoparticles as a solid phase heterogeneous catalyst has been evaluated, for the first time, on the well-known 4-nitrophenol (4-NP) reduction to 4-aminophenol (4-AP) in the presence of excess borohydride. The reduction was very efficient and followed zero-order kinetics for both Ag and Au nanocomposites. The effects of borohydride, initial 4-NP concentration, and catalyst dose were evaluated. The catalyst efficiency was examined on the basis of turnover frequency (TOF) and recyclability. The catalytic efficiency of alginate-based Ag catalyst was much more compared to that of the Au catalyst. The as-prepared new solid-phase biopolymer-based catalysts are very efficient, stable, easy to prepare, eco-friendly, and cost-effective, and they have the potential for industrial applications.

Microwave chemistry for inorganic nanomaterials synthesis

2010-01-01

Idalia Bilecka , Markus Niederberger

This Feature Article gives an overview of microwave-assisted liquid phase routes to inorganic nanomaterials. Whereas microwave chemistry is a well-established technique in organic synthesis, its use in inorganic nanomaterials' synthesis … This Feature Article gives an overview of microwave-assisted liquid phase routes to inorganic nanomaterials. Whereas microwave chemistry is a well-established technique in organic synthesis, its use in inorganic nanomaterials' synthesis is still at the beginning and far away from having reached its full potential. However, the rapidly growing number of publications in this field suggests that microwave chemistry will play an outstanding role in the broad field of Nanoscience and Nanotechnology. This article is not meant to give an exhaustive overview of all nanomaterials synthesized by the microwave technique, but to discuss the new opportunities that arise as a result of the unique features of microwave chemistry. Principles, advantages and limitations of microwave chemistry are introduced, its application in the synthesis of different classes of functional nanomaterials is discussed, and finally expected benefits for nanomaterials' synthesis are elaborated.

Toward Greener Nanosynthesis

2007-06-01

Jennifer A. Dahl , Bettye L. S. Maddux , James E. Hutchison

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward Greener NanosynthesisJennifer A. Dahl, Bettye L. S. Maddux, and James E. HutchisonView Author Information Department of Chemistry and Materials Science Institute, University of Oregon, 1253 University … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward Greener NanosynthesisJennifer A. Dahl, Bettye L. S. Maddux, and James E. HutchisonView Author Information Department of Chemistry and Materials Science Institute, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403 Cite this: Chem. Rev. 2007, 107, 6, 2228–2269Publication Date (Web):June 13, 2007Publication History Received15 February 2007Published online13 June 2007Published inissue 1 June 2007https://pubs.acs.org/doi/10.1021/cr050943khttps://doi.org/10.1021/cr050943kresearch-articleACS PublicationsCopyright © 2007 American Chemical SocietyRequest reuse permissionsArticle Views13943Altmetric-Citations1099LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Ligands,Metal nanoparticles,Nanomaterials,Nanoparticles,Solvents Get e-Alerts

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Synthesis and Size-Selective Catalysis by Supported Gold Nanoparticles: Study on Heterogeneous and Homogeneous Catalytic Process

2007-03-01

Sudipa Panigrahi , Soumen Basu , Snigdhamayee Praharaj +5 more

Core−shell nanocomposites (R−Au) bearing well-defined gold nanoparticles as surface atoms of variable sizes (8−55 nm) have been synthesized exploiting polystyrene-based commercial anion exchangers. Immobilization of gold nanoparticles, prepared by the … Core−shell nanocomposites (R−Au) bearing well-defined gold nanoparticles as surface atoms of variable sizes (8−55 nm) have been synthesized exploiting polystyrene-based commercial anion exchangers. Immobilization of gold nanoparticles, prepared by the Frens method, onto the resin beads in the chloride form is possible by the ready exchange of the citrate-capped negatively charged gold particles. The difficulty of nanoparticle loading, avoiding aggregation, has been solved by stepwise operation. Analysis of the gold particles after immobilization and successive elution confirm the unaltered particle morphology while compared to those of the citrate-capped gold particles in colloidal dispersion. It was observed that the rate of the reaction increases with the increase in catalyst loading, which suggests the catalytic behavior of the gold nanoparticles for the reduction of the aromatic nitrocompounds. The rate constant, k, was found to be proportional to the total surface area of the nanoparticles in the system. Kinetic study for the reduction of a series of aromatic nitrocompounds reveals that the aromatic nitrocompound exclusively adsorbs to atop sites of gold particles and that the rate of the reduction reaction increases as the particle size decreases. Similar reaction kinetics was observed involving gold sol of variable size (homogeneous catalysis) as catalyst. The induction time and the activation energy of the reaction decreases with decrease in particle size indicating the decrease in activation energy for the smaller particles, which also speaks for the increase of surface roughness with decrease in particle size. The observed rate dependence, in relation to particle size, is attributed to a higher reactivity of the coordinatively unsaturated surface atoms in small particles compared to low-index surface atoms prevalent in larger particles.

FeOx-supported platinum single-atom and pseudo-single-atom catalysts for chemoselective hydrogenation of functionalized nitroarenes

2014-12-03

Haisheng Wei , Xiaoyan Liu , Aiqin Wang +7 more

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Green chemistry by nano-catalysis

2010-01-01

Vivek Polshettiwar , Rajender S. Varma

Nano-materials are important in many diverse areas, from basic research to various applications in electronics, biochemical sensors, catalysis and energy. They have emerged as sustainable alternatives to conventional materials, as … Nano-materials are important in many diverse areas, from basic research to various applications in electronics, biochemical sensors, catalysis and energy. They have emerged as sustainable alternatives to conventional materials, as robust high surface area heterogeneous catalysts and catalyst supports. The nano-sized particles increase the exposed surface area of the active component of the catalyst, thereby enhancing the contact between reactants and catalyst dramatically and mimicking the homogeneous catalysts. This review focuses on the use of nano-catalysis for green chemistry development including the strategy of using microwave heating with nano-catalysis in benign aqueous reaction media which offers an extraordinary synergistic effect with greater potential than these three components in isolation. To illustrate the proof-of-concept of this “green and sustainable” approach, representative examples are discussed in this article.

Completely “Green” Synthesis and Stabilization of Metal Nanoparticles

2003-10-22

Poovathinthodiyil Raveendran , Jie Fu , Scott L. Wallen

In the present Communication, a completely "green" synthetic method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. By gentle heating of an aqueous … In the present Communication, a completely "green" synthetic method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. By gentle heating of an aqueous starch solution containing silver nitrate and glucose, we produce relatively monodisperse, starched silver nanoparticles. β-d-Glucose serves as the green reducing agent, while starch serves as the stabilization agent.

Effect of Catalysis on the Stability of Metallic Nanoparticles: Suzuki Reaction Catalyzed by PVP-Palladium Nanoparticles

2003-06-17

Radha Narayanan , Mostafa A. El‐Sayed

The small size of nanoparticles makes them attractive in catalysis due to their large surface-to-volume ratio. However, being small raises questions about their stability in the harsh chemical environment in … The small size of nanoparticles makes them attractive in catalysis due to their large surface-to-volume ratio. However, being small raises questions about their stability in the harsh chemical environment in which these nanoparticles find themselves during their catalytic function. In the present work, we studied the Suzuki reaction between phenylboronic acid and iodobenzene catalyzed by PVP-Pd nanoparticles to investigate the effect of catalysis, recycling, and the different individual chemicals on the stability and catalytic activity of the nanoparticles during this harsh reaction. The stability of the nanoparticles to the different perturbations is assessed using TEM, and the changes in the catalytic activity are assessed using HPLC analysis of the product yield. It was found that the process of refluxing the nanoparticles for 12 h during the Suzuki catalytic reaction increases the average size and the width of the distribution of the nanoparticles. This was attributed to Ostwald ripening in which the small nanoparticles dissolve to form larger nanoparticles. The kinetics of the change in the nanoparticle size during the 12 h period show that the nanoparticles increase in size during the beginning of the reaction and level off toward the end of the first cycle. When the nanoparticles are recycled for the second cycle, the average size decreases. This could be due to the larger nanoparticles aggregating and precipitating out of solution. This process could also explain the observed loss of the catalytic efficiency of the nanoparticles during the second cycle. It is also found that the addition of biphenyl to the reaction mixture results in it poisoning the active sites and giving rise to a low product yield. The addition of excess PVP stabilizer to the reaction mixture seems to lead to the stability of the nanoparticle surface and size, perhaps due to the inhibition of the Ostwald ripening process. This also decreases the catalytic efficiency of the nanoparticles due to capping of the nanoparticle surface. The addition of phenylboronic acid is found to lead to the stability of the size distribution as it binds to the particle surface through the O(-) of the OH group and acts as a stabilizer. Iodobenzene is found to have no effect and thus probably does not bind strongly to the surface during the catalytic process. These two results might have an implication on the catalytic mechanism of this reaction.

Nanoscale Fe 2 O 3 -Based Catalysts for Selective Hydrogenation of Nitroarenes to Anilines

2013-11-28

Rajenahally V. Jagadeesh , Annette‐Enrica Surkus , Henrik Junge +7 more

Lighter Hydrogenation Catalysts Enzymes have evolved to use abundant metals such as iron, cobalt, and nickel for redox catalysis. However, synthetic catalysis has generally relied on the rarer, heavier relatives … Lighter Hydrogenation Catalysts Enzymes have evolved to use abundant metals such as iron, cobalt, and nickel for redox catalysis. However, synthetic catalysis has generally relied on the rarer, heavier relatives of these elements: ruthenium, rhodium, iridium, palladium, and platinum (see the Perspective by Bullock ). Friedfeld et al. (p. 1076 ) used high-throughput screening to show that the right cobalt precursor can be activated for asymmetric hydrogenation catalysis by using the traditional ligands developed for the precious metals. Zuo et al. (p. 1080 ) focused on iron, demonstrating a highly effective asymmetric transfer hydrogenation catalyst that uses a ligand rationally designed after careful mechanistic study. Jagadeesh et al. (p. 1073 ) prepared supported iron catalysts that selectively reduce nitro substituents on aromatic rings to amines, thereby facilitating the preparation of a wide range of aniline derivatives.

Magnetically Recoverable Nanocatalysts

2011-03-14

Vivek Polshettiwar , Rafael Luque , Aziz Fihri +3 more

ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTMagnetically Recoverable NanocatalystsVivek Polshettiwar*†, Rafael Luque‡, Aziz Fihri†, Haibo Zhu†, Mohamed Bouhrara†, and Jean-Marie Basset*†View Author Information† KAUST Catalysis Center (KCC), King Abdullah University of Science and … ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTMagnetically Recoverable NanocatalystsVivek Polshettiwar*†, Rafael Luque‡, Aziz Fihri†, Haibo Zhu†, Mohamed Bouhrara†, and Jean-Marie Basset*†View Author Information† KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia‡ Departamento de Química Orgánica, Universidad de Córdoba, Córdoba, Spain*E-mail: [email protected] (V.P.); [email protected]. (J.-M.B.).Cite this: Chem. Rev. 2011, 111, 5, 3036–3075Publication Date (Web):March 14, 2011Publication History Received21 July 2010Published online14 March 2011Published inissue 11 May 2011https://pubs.acs.org/doi/10.1021/cr100230zhttps://doi.org/10.1021/cr100230zreview-articleACS PublicationsCopyright © 2011 American Chemical SocietyRequest reuse permissionsArticle Views20378Altmetric-Citations1503LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Anions,Catalysts,Materials,Nanoparticles,Palladium Get e-Alerts

A Nanoreactor Framework of a Au@SiO2 Yolk/Shell Structure for Catalytic Reduction of p‐Nitrophenol

2008-04-02

Joongoo Lee , Ji Chan Park , Hyunjoon Song

A nanoreactor system comprising gold cores and silica hollow shells with empty inner space demonstrated. The Au@SiO2 yolk/shell nanoreactor is synthesized by selective etching of the gold cores in Au@SiO2 … A nanoreactor system comprising gold cores and silica hollow shells with empty inner space demonstrated. The Au@SiO2 yolk/shell nanoreactor is synthesized by selective etching of the gold cores in Au@SiO2 core/shell particles (see figure). This nanoreactor framework catalyzes the reduction of p-nitrophenol, exhibiting interesting size-dependent reaction property.

Yolk/shell nanoparticles: new platforms for nanoreactors, drug delivery and lithium-ion batteries

2011-01-01

Jian Liu , Shi Zhang Qiao , Jun Song Chen +3 more

Yolk/shell or 'rattle-typed' nanomaterials with nanoparticle cores inside hollow shells are interesting among the complex hollow nanostructures. Yolk/shell nanoparticles (YSNs) are promising functional nanomaterials for a variety of applications such … Yolk/shell or 'rattle-typed' nanomaterials with nanoparticle cores inside hollow shells are interesting among the complex hollow nanostructures. Yolk/shell nanoparticles (YSNs) are promising functional nanomaterials for a variety of applications such as catalysis, delivery, lithium-ion batteries and biosensors due to their tailorability and functionality in both the cores and hollow shells. This feature article provides an overview of advances in this exciting area of YSNs, covering systematic synthesis approaches and key promising applications based on the literature and our own recent work. We present some strategies for the synthesis of YSNs with controllable sizes, compositions, geometries, structures and functionalities. Applications of these new materials in a wide range of potential areas are discussed including nanoreactors, biomedicine and lithium-ion batteries. Promising future directions of this active research field are also highlighted.

Nano-magnetite (Fe3O4) as a support for recyclable catalysts in the development of sustainable methodologies

2013-01-01

Manoj B. Gawande , Paula S. Branco , Rajender S. Varma

Surface functionalization of nano-magnetic nanoparticles is a well-designed way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of magnetic nanoparticles (MNPs) in a variety of solid matrices … Surface functionalization of nano-magnetic nanoparticles is a well-designed way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of magnetic nanoparticles (MNPs) in a variety of solid matrices allows the combination of well-known procedures for catalyst heterogenization with techniques for magnetic separation. Magnetite is a well-known material, also known as ferrite (Fe3O4), and can be used as a versatile support for functionalization of metals, organocatalysts, N-heterocyclic carbenes, and chiral catalysts. It is used as a support for important homogeneous catalytically active metals such as Pd, Pt, Cu, Ni, Co, Ir, etc. to obtain stable and magnetically recyclable heterogeneous catalysts. Homogeneous organocatalysts can be successfully decorated with linkers/ligands on the surface of magnetite or alternatively the organocatalysts can be directly immobilized on the surface of magnetite. The functionalized magnetically retrievable catalysts or nanocatalysts that are increasingly being used in catalysis, green chemistry and pharmaceutically significant reactions are summarized in this review.

Kinetic Analysis of Catalytic Reduction of 4-Nitrophenol by Metallic Nanoparticles Immobilized in Spherical Polyelectrolyte Brushes

2010-04-21

Stefanie Wunder , Frank Polzer , Yan Lü +2 more

We present a study on the catalytic reduction of 4-nitrophenol by sodium borohydride in the presence of metal nanoparticles. The nanoparticles are embedded in spherical polyelectrolyte brushes, which consist of … We present a study on the catalytic reduction of 4-nitrophenol by sodium borohydride in the presence of metal nanoparticles. The nanoparticles are embedded in spherical polyelectrolyte brushes, which consist of a polystyrene core onto which a dense layer of cationic polyelectrolyte brushes are grafted. The average size of the nanoparticles is approximately 2 nm. The kinetic data obtained by monitoring the reduction of 4-nitrophenol by UV/vis-spectroscopy could be explained in terms of the Langmuir−Hinshelwood model: The borohydride ions transfer a surface-hydrogen species in a reversible manner to the surface. Concomitantly 4-nitrophenol is adsorbed and the rate-determining step consists of the reduction of nitrophenol by the surface-hydrogen species. The apparent reaction rate can therefore be related to the total surface S of the nanoparticles, to the kinetic constant k related to the rate-determining step, and to the adsorption constants KNip and KBH4 of nitrophenol and of borohydride, respectively. In all cases, an induction time t0 was observed of the order of minutes. The reciprocal induction time can be treated as a reaction rate that is directly related to the kinetics of the surface reaction because there is a linear relation between 1/(kt0) and the concentration of nitrophenol in the solution. All data obtained for t0 so far and a comparison with data from literature indicate that the induction time is related to a slow surface reconstruction of the nanoparticles, the rate of which is directly related to the surface reaction.

Green chemistry for nanoparticle synthesis

2015-01-01

Haohong Duan , Dingsheng Wang , Yadong Li

This review describes the principles of green chemistry applied to the field of nanoparticle synthesis. This review describes the principles of green chemistry applied to the field of nanoparticle synthesis.

Basic concepts and recent advances in nitrophenol reduction by gold- and other transition metal nanoparticles

2015-01-15

Pengxiang Zhao , Xingwen Feng , Deshun Huang +2 more

Multifunctional Mesoporous Composite Microspheres with Well-Designed Nanostructure: A Highly Integrated Catalyst System

2010-05-27

Yonghui Deng , Yue Cai , Zhenkun Sun +7 more

The precise control of the size, morphology, surface chemistry, and assembly process of each component is important to construction of integrated functional nanocomposites. We report here the fabrication of multifunctional … The precise control of the size, morphology, surface chemistry, and assembly process of each component is important to construction of integrated functional nanocomposites. We report here the fabrication of multifunctional microspheres which possess a core of nonporous silica-protected magnetite particles, transition layer of active gold nanoparticles, and an outer shell of ordered mesoporous silica with perpendicularly aligned pore channels. The well-designed microspheres have high magnetization (18.6 emu/g), large surface area (236 m2/g), highly open mesopores (∼2.2 nm), and stably confined but accessible Au nanoparticles and, as a result, show high performance in catalytic reduction of 4-nitrophenol (with conversion of 95% in 12 min), styrene epoxidation with high conversion (72%) and selectivity (80%), especial convenient magnetic separability, long life and good reusability. The unique nanostructure makes the microsphere to be a novel stable and approachable catalyst system for various catalytic industry processes.

Magnetic Nanoparticles: Synthesis, Protection, Functionalization, and Application

2007-02-05

An‐Hui Lu , Elena Lorena Salabaş , Ferdi Schüth

Abstract This review focuses on the synthesis, protection, functionalization, and application of magnetic nanoparticles, as well as the magnetic properties of nanostructured systems. Substantial progress in the size and shape … Abstract This review focuses on the synthesis, protection, functionalization, and application of magnetic nanoparticles, as well as the magnetic properties of nanostructured systems. Substantial progress in the size and shape control of magnetic nanoparticles has been made by developing methods such as co‐precipitation, thermal decomposition and/or reduction, micelle synthesis, and hydrothermal synthesis. A major challenge still is protection against corrosion, and therefore suitable protection strategies will be emphasized, for example, surfactant/polymer coating, silica coating and carbon coating of magnetic nanoparticles or embedding them in a matrix/support. Properly protected magnetic nanoparticles can be used as building blocks for the fabrication of various functional systems, and their application in catalysis and biotechnology will be briefly reviewed. Finally, some future trends and perspectives in these research areas will be outlined.

Large-Scale Synthesis of Uniform Silver Nanowires Through a Soft, Self-Seeding, Polyol Process

2002-06-05

Yugang Sun , Younan Xia

A self-seeding process is used to generate bicrystalline silver nanowires by reducing AgNO3 with ethylene glycol at ∼160 °C. The key to the success of this solution-phase approach is the … A self-seeding process is used to generate bicrystalline silver nanowires by reducing AgNO3 with ethylene glycol at ∼160 °C. The key to the success of this solution-phase approach is the use of a polymeric "coordination reagent" capable of controlling the growth rates of different faces of silver. Uniform nanowires (see Figure) could be routinely synthesized with diameters of ∼60 nm and lengths up to ∼50 μm.

Reduced Transition Metal Colloids: A Novel Family of Reusable Catalysts?

2002-09-10

Alain Roucoux , Jürgen Schulz , Henri Patin

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced Transition Metal Colloids: A Novel Family of Reusable Catalysts?Alain Roucoux, Jürgen Schulz, and Henri PatinView Author Information Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduced Transition Metal Colloids: A Novel Family of Reusable Catalysts?Alain Roucoux, Jürgen Schulz, and Henri PatinView Author Information Ecole Nationale Supérieure de Chimie de Rennes, UMR CNRS 6052 "Synthèses et Activations de Biomolécules", Institut de Chimie de Rennes, Avenue du Gal Leclerc − 35700 Rennes, France Cite this: Chem. Rev. 2002, 102, 10, 3757–3778Publication Date (Web):September 10, 2002Publication History Received30 January 2002Published online10 September 2002Published inissue 1 October 2002https://pubs.acs.org/doi/10.1021/cr010350jhttps://doi.org/10.1021/cr010350jresearch-articleACS PublicationsCopyright © 2002 American Chemical SocietyRequest reuse permissionsArticle Views13864Altmetric-Citations1699LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Colloidal particles,Colloids,Metal nanoparticles,Metals,Nanoparticles Get e-Alerts

Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol

2012-01-01

Jing Li , Chunyan Liu , Yun Liu

A cylindrical piece of Au/graphene hydrogel, 1.08 cm in diameter and 1.28 cm in height, has been synthesized through the self-assembly of Au/graphene sheets under hydrothermal conditions for the first … A cylindrical piece of Au/graphene hydrogel, 1.08 cm in diameter and 1.28 cm in height, has been synthesized through the self-assembly of Au/graphene sheets under hydrothermal conditions for the first time. The hydrogel, containing 2.26 wt% Au, 6.94 wt% graphene, and 90.8 wt% water, exhibited excellent catalytic performance towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), which is about 90 times larger than previously reported values for spongy Au nanoparticles and 14 times more than the highest value among the polymer supported Au nanoparticle catalysts. The high catalytic activity arises from the synergistic effect of graphene: (1) the high adsorption ability of graphene towards 4-NP, providing a high concentration of 4-NP near to the Au nanoparticles on graphene; and (2) electron transfer from graphene to Au nanoparticles, facilitating the uptake of electrons by 4-NP molecules.

Catalysis by metallic nanoparticles in aqueous solution: model reactions

2012-01-01

Pablo Hervés , Moisés Pérez‐Lorenzo , Luis M. Liz‐Marzán +3 more

Catalysis by metallic nanoparticles is certainly among the most intensely studied problems in modern nanoscience. However, reliable tests for catalytic performance of such nanoparticles are often poorly defined, which makes … Catalysis by metallic nanoparticles is certainly among the most intensely studied problems in modern nanoscience. However, reliable tests for catalytic performance of such nanoparticles are often poorly defined, which makes comparison and benchmarking rather difficult. We tackle in this tutorial review a subset of well-studied reactions that take place in aqueous phase and for which a comprehensive kinetic analysis is available. Two of these catalytic model reactions are under consideration here, namely the reduction of (i) p-nitrophenol and (ii) hexacyanoferrate (iii), both by borohydride ions. Both reactions take place at the surface of noble metal nanoparticles at room temperature and can be accurately monitored by UV-vis spectroscopy. Moreover, the total surface area of the nanoparticles in solution can be known with high precision and thus can be directly used for the kinetic analysis. Hence, these model reactions represent cases of heterogeneous catalysis that can be modelled with the accuracy typically available for homogeneous catalysis. Both model reactions allow us to discuss a number of important concepts and questions, namely the dependence of catalytic activity on the size of the nanoparticles, electrochemistry of nanoparticles, surface restructuring, the use of carrier systems and the role of diffusion control.

Heterogeneous Basic Catalysis

1995-05-01

Hideshi Hattori

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous Basic CatalysisHideshi HattoriCite this: Chem. Rev. 1995, 95, 3, 537–558Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://doi.org/10.1021/cr00035a005RIGHTS & PERMISSIONSArticle Views8515Altmetric-Citations845LEARN … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous Basic CatalysisHideshi HattoriCite this: Chem. Rev. 1995, 95, 3, 537–558Publication Date (Print):May 1, 1995Publication History Published online1 May 2002Published inissue 1 May 1995https://doi.org/10.1021/cr00035a005RIGHTS & PERMISSIONSArticle Views8515Altmetric-Citations845LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (3 MB) Get e-Alertsclose Get e-Alerts

A Stable Single‐Site Palladium Catalyst for Hydrogenations

2015-07-31

Gianvito Vilé , Davide Albani , Maarten Nachtegaal +5 more

We report the preparation and hydrogenation performance of a single-site palladium catalyst that was obtained by the anchoring of Pd atoms into the cavities of mesoporous polymeric graphitic carbon nitride. … We report the preparation and hydrogenation performance of a single-site palladium catalyst that was obtained by the anchoring of Pd atoms into the cavities of mesoporous polymeric graphitic carbon nitride. The characterization of the material confirmed the atomic dispersion of the palladium phase throughout the sample. The catalyst was applied for three-phase hydrogenations of alkynes and nitroarenes in a continuous-flow reactor, showing its high activity and product selectivity in comparison with benchmark catalysts based on nanoparticles. Density functional theory calculations provided fundamental insights into the material structure and attributed the high catalyst activity and selectivity to the facile hydrogen activation and hydrocarbon adsorption on atomically dispersed Pd sites.

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Industrial applications of nanoparticles

2015-01-01

Wendelin J. Stark , Philipp R. Stoessel , Wendel Wohlleben +1 more

Research efforts in the past two decades have resulted in thousands of potential application areas for nanoparticles – which materials have become industrially relevant? Where are sustainable applications of nanoparticles … Research efforts in the past two decades have resulted in thousands of potential application areas for nanoparticles – which materials have become industrially relevant? Where are sustainable applications of nanoparticles replacing traditional processing and materials? This tutorial review starts with a brief analysis on what makes nanoparticles attractive to chemical product design. The article highlights established industrial applications of nanoparticles and then moves to rapidly emerging applications in the chemical industry and discusses future research directions. Contributions from large companies, academia and high-tech start-ups are used to elucidate where academic nanoparticle research has revolutionized industry practice. A nanomaterial-focused analysis discusses new trends, such as particles with an identity, and the influence of modern instrument advances in the development of novel industrial products.

Chemoselective Hydrogenation of Nitro Compounds with Supported Gold Catalysts

2006-07-20

Avelino Corma , Pedro Serna

The selective reduction of a nitro group when other reducible functions are present is a difficult process that often requires stoichiometric amounts of reducing agents or, if H2 is used, … The selective reduction of a nitro group when other reducible functions are present is a difficult process that often requires stoichiometric amounts of reducing agents or, if H2 is used, the addition of soluble metals. Gold nanoparticles supported on TiO2 or Fe2O3 catalyzed the chemoselective hydrogenation of functionalized nitroarenes with H2 under mild reaction conditions that avoided the accumulation of hydroxylamines and their potential exothermic decomposition. These chemoselective hydrogenation gold catalysts also provide a previously unknown route for the synthesis of the industrially relevant cyclohexanone oxime from 1-nitro-1-cyclohexene.

Magnetically Separable Nanocatalysts: Bridges between Homogeneous and Heterogeneous Catalysis

2010-04-23

Sankaranarayanapillai Shylesh , Volker Schünemann , Werner R. Thiel

Recovery and reuse of expensive catalysts after catalytic reactions are important factors for sustainable process management. The aim of this Review is to highlight the progress in the formation and … Recovery and reuse of expensive catalysts after catalytic reactions are important factors for sustainable process management. The aim of this Review is to highlight the progress in the formation and catalytic applications of magnetic nanoparticles and magnetic nanocomposites. Directed functionalization of the surfaces of nanosized magnetic materials is an elegant way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of magnetic nanoparticles in a variety of solid matrices allows the combination of well-known procedures for catalyst heterogenization with techniques for magnetic separation.

A Comparison Study of the Catalytic Properties of Au-Based Nanocages, Nanoboxes, and Nanoparticles

2009-11-23

Jie Zeng , Qiang Zhang , Jingyi Chen +1 more

We have evaluated the catalytic properties of Au-based nanostructures (including nanocages, nanoboxes, and solid nanoparticles) using a model reaction based on the reduction of p-nitrophenol by NaBH(4). From the average … We have evaluated the catalytic properties of Au-based nanostructures (including nanocages, nanoboxes, and solid nanoparticles) using a model reaction based on the reduction of p-nitrophenol by NaBH(4). From the average reaction rate constants at three different temperatures, we determined the activation energy, the entropy of activation, and the pre-exponential factor for each type of Au nanostructure. The kinetic data indicate that the Au-based nanocages are catalytically more active than both the nanoboxes and nanoparticles probably due to their extremely thin but electrically continuous walls, the high content of Au, and the accessibility of both inner and outer surfaces through the pores in the walls. In addition, a compensation effect was observed in this Au-based catalytic system, which can be primarily interpreted by a model based on kinetic regime switching.

Catalysis with Transition Metal Nanoparticles in Colloidal Solution: Nanoparticle Shape Dependence and Stability

2005-06-04

Radha Narayanan , Mostafa A. El‐Sayed

While the nanocatalysis field has undergone an explosive growth during the past decade, there have been very few studies in the area of shape-dependent catalysis and the effect of the … While the nanocatalysis field has undergone an explosive growth during the past decade, there have been very few studies in the area of shape-dependent catalysis and the effect of the catalytic process on the shape and size of transition metal nanoparticles as well as their recycling potential. Metal nanoparticles of different shapes have different crystallographic facets and have different fraction of surface atoms on their corners and edges, which makes it interesting to study the effect of metal nanoparticle shape on the catalytic activity of various organic and inorganic reactions. Transition metal nanoparticles are attractive to use as catalysts due to their high surface-to-volume ratio compared to bulk catalytic materials, but their surface atoms could be so active that changes in the size and shape of the nanoparticles could occur during the course of their catalytic function, which could also affect their recycling potential. In this Feature Article, we review our work on the effect of the shape of the colloidal nanocatalyst on the catalytic activity as well as the effect of the catalytic process on the shape and size of the colloidal transition metal nanocatalysts and their recycling potential. These studies provide important clues on the mechanism of the reactions we studied and also can be very useful in the process of designing better catalysts in the future.

Surface Organometallic and Coordination Chemistry toward Single-Site Heterogeneous Catalysts: Strategies, Methods, Structures, and Activities

2016-01-07

Christophe Copéret , Aleix Comas‐Vives , Matthew P. Conley +6 more

ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSurface Organometallic and Coordination Chemistry toward Single-Site Heterogeneous Catalysts: Strategies, Methods, Structures, and ActivitiesChristophe Copéret*†, Aleix Comas-Vives†, Matthew P. Conley†, Deven P. Estes†, Alexey Fedorov†, Victor Mougel†, … ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTSurface Organometallic and Coordination Chemistry toward Single-Site Heterogeneous Catalysts: Strategies, Methods, Structures, and ActivitiesChristophe Copéret*†, Aleix Comas-Vives†, Matthew P. Conley†, Deven P. Estes†, Alexey Fedorov†, Victor Mougel†, Haruki Nagae†‡, Francisco Núñez-Zarur†, and Pavel A. Zhizhko†§View Author Information† Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1−5, CH-8093 Zürich, Switzerland‡ Department of Chemistry, Graduate School of Engineering Science, Osaka University, CREST, Toyonaka, Osaka 560-8531, Japan§ A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia*E-mail: [email protected]Cite this: Chem. Rev. 2016, 116, 2, 323–421Publication Date (Web):January 7, 2016Publication History Received26 June 2015Published online7 January 2016Published inissue 27 January 2016https://doi.org/10.1021/acs.chemrev.5b00373Copyright © 2016 American Chemical SocietyRIGHTS & PERMISSIONSACS AuthorChoiceArticle Views30170Altmetric-Citations567LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (46 MB) Get e-AlertscloseSupporting Info (1)»Supporting Information Supporting Information SUBJECTS:Catalysts,Hydrocarbons,Ligands,Oxides,Silica Get e-Alerts

Cu and Cu-Based Nanoparticles: Synthesis and Applications in Catalysis

2016-03-03

Manoj B. Gawande , Anandarup Goswami , François‐Xavier Felpin +6 more

The applications of copper (Cu) and Cu-based nanoparticles, which are based on the earth-abundant and inexpensive copper metal, have generated a great deal of interest in recent years, especially in … The applications of copper (Cu) and Cu-based nanoparticles, which are based on the earth-abundant and inexpensive copper metal, have generated a great deal of interest in recent years, especially in the field of catalysis. The possible modification of the chemical and physical properties of these nanoparticles using different synthetic strategies and conditions and/or via postsynthetic chemical treatments has been largely responsible for the rapid growth of interest in these nanomaterials and their applications in catalysis. In addition, the design and development of novel support and/or multimetallic systems (e.g., alloys, etc.) has also made significant contributions to the field. In this comprehensive review, we report different synthetic approaches to Cu and Cu-based nanoparticles (metallic copper, copper oxides, and hybrid copper nanostructures) and copper nanoparticles immobilized into or supported on various support materials (SiO2, magnetic support materials, etc.), along with their applications in catalysis. The synthesis part discusses numerous preparative protocols for Cu and Cu-based nanoparticles, whereas the application sections describe their utility as catalysts, including electrocatalysis, photocatalysis, and gas-phase catalysis. We believe this critical appraisal will provide necessary background information to further advance the applications of Cu-based nanostructured materials in catalysis.

Synergistic Catalysis of Au@Ag Core−Shell Nanoparticles Stabilized on Metal−Organic Framework

2011-01-07

Hai‐Long Jiang , Tomoki Akita , Tamao Ishida +2 more

For the first time, this work presents Au@Ag core-shell nanoparticles (NPs) immobilized on a metal-organic framework (MOF) by a sequential deposition-reduction method. The small-size Au@Ag NPs reveal the restriction effects … For the first time, this work presents Au@Ag core-shell nanoparticles (NPs) immobilized on a metal-organic framework (MOF) by a sequential deposition-reduction method. The small-size Au@Ag NPs reveal the restriction effects of the pore/surface structure in the MOF. The modulation of the Au/Ag ratio can tune the composition and a reversed Au/Ag deposition sequence changes the structure of Au-Ag NPs, while a posttreatment process transforms the core-shell NPs to a AuAg alloy. Catalytic studies show a strong bimetallic synergistic effect of core-shell structured Au@Ag NPs, which have much higher catalytic activities than alloy and monometallic NPs.

A Systematic Study of the Synthesis of Silver Nanoplates: Is Citrate a “Magic” Reagent?

2011-10-14

Qiao Zhang , Na Li , James Goebl +2 more

In this work we have carried out systematic studies and identified the critical role of hydrogen peroxide instead of the generally believed citrate in the well-known chemical reduction route to … In this work we have carried out systematic studies and identified the critical role of hydrogen peroxide instead of the generally believed citrate in the well-known chemical reduction route to silver nanoplates. This improved understanding allows us to develop consistently reproducible processes for the synthesis of nanoplates with high efficiency and yields. By harnessing the oxidative power of H(2)O(2), various silver sources including silver salts and metallic silver can be directly converted to nanoplates with the assistance of an appropriate capping ligand, thus significantly enhancing the reproducibility of the synthesis. Contrary to the previous conclusion that citrate is the key component, we have determined that the group of ligands with selective adhesion to Ag (111) facets can be expanded to many di- and tricarboxylate compounds whose two nearest carboxylate groups are separated by two or three carbon atoms. We have also found that the widely used secondary ligand polyvinylpyrrolidone can be replaced by many hydroxyl group-containing compounds or even removed entirely while still producing nanoplates of excellent uniformity and stability. In addition to the general understanding of NaBH(4) as a reducing agent, it has also been found to act as a capping agent to stabilize the silver nanoparticles, prolong the initiation time required for nanoplate nucleation, and contribute to the control of the thickness as well as the aspect ratio of silver nanoplates. The improved insight into the specific roles of the reaction components and significantly enhanced reproducibility are expected to help elucidate the formation mechanism of this interesting nanostructure.

Fast-Growing Field of Magnetically Recyclable Nanocatalysts

2014-06-03

Dong Wang , Didier Astruc

ADVERTISEMENT RETURN TO ISSUEReviewNEXTFast-Growing Field of Magnetically Recyclable NanocatalystsDong Wang and Didier Astruc*View Author Information ISM, University of Bordeaux, 351 Cours de la Libération, 33405 Talence Cedex, France*E-mail: [email protected]Cite … ADVERTISEMENT RETURN TO ISSUEReviewNEXTFast-Growing Field of Magnetically Recyclable NanocatalystsDong Wang and Didier Astruc*View Author Information ISM, University of Bordeaux, 351 Cours de la Libération, 33405 Talence Cedex, France*E-mail: [email protected]Cite this: Chem. Rev. 2014, 114, 14, 6949–6985Publication Date (Web):June 3, 2014Publication History Received5 March 2014Published online3 June 2014Published inissue 23 July 2014https://pubs.acs.org/doi/10.1021/cr500134hhttps://doi.org/10.1021/cr500134hreview-articleACS PublicationsCopyright © 2014 American Chemical SocietyRequest reuse permissionsArticle Views10070Altmetric-Citations679LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Catalysts,Catalytic activity,Catalytic reactions,Palladium,Selectivity Get e-Alerts

Role of nanomaterials in water treatment applications: A review

2016-08-11

Chella Santhosh , V. Velmurugan , George Jacob +3 more

The optical principles of the diffraction of X-rays

1949-05-01

Joseph Singer

Direct transformation of bulk copper into copper single sites via emitting and trapping of atoms

2018-09-25

Yunteng Qu , Zhijun Li , Wenxing Chen +7 more

Sustainable Preparation of Supported Metal Nanoparticles and Their Applications in Catalysis

2009-01-13

J.M. Campelo , Diego Luna , Rafael Luque +2 more

Metal nanoparticles have attracted much attention over the last decade owing to their unique properties as compared to their bulk metal equivalents, including a large surface-to-volume ratio and tunable shapes. … Metal nanoparticles have attracted much attention over the last decade owing to their unique properties as compared to their bulk metal equivalents, including a large surface-to-volume ratio and tunable shapes. To control the properties of nanoparticles with particular respect to shape, size and dispersity is imperative, as these will determine the activity in the desired application. Supported metal nanoparticles are widely employed in catalysis. Recent advances in controlling the shape and size of nanoparticles have opened the possibility to optimise the particle geometry for enhanced catalytic activity, providing the optimum size and surface properties for specific applications. This Review describes the state of the art with respect to the preparation and use of supported metal nanoparticles in catalysis. The main groups of such nanoparticles (noble and transition metal nanoparticles) are highlighted and future prospects are discussed.

Selective Hydrogenation over Supported Metal Catalysts: From Nanoparticles to Single Atoms

2019-09-24

Leilei Zhang , Maoxiang Zhou , Aiqin Wang +1 more

Selective catalytic hydrogenation has wide applications in both petrochemical and fine chemical industries, however, it remains challenging when two or multiple functional groups coexist in the substrate. To tackle this … Selective catalytic hydrogenation has wide applications in both petrochemical and fine chemical industries, however, it remains challenging when two or multiple functional groups coexist in the substrate. To tackle this challenge, the "active site isolation" strategy has been proved effective, and various approaches to the site isolation have been developed. In this review, we have summarized these approaches, including adsorption/grafting of N/S-containing organic molecules on the metal surface, partial covering of active metal surface by metal oxides either via doping or through strong metal-support interaction, confinement of active metal nanoparticles in micro- or mesopores of the supports, formation of bimetallic alloys or intermetallics or core@shell structures with a relatively inert metal (IB and IIB) or nonmetal element (B, C, S, etc.), and construction of single-atom catalysts on reducible oxides or inert metals. Both advantages and disadvantages of each approach toward the site isolation have been discussed for three types of chemoselective hydrogenation reactions, including alkynes/dienes to monoenes, α,β-unsaturated aldehydes/ketones to the unsaturated alcohols, and substituted nitroarenes to the corresponding anilines. The key factors affecting the catalytic activity/selectivity, in particular, the geometric and electronic structure of the active sites, are discussed with the aim to extract fundamental principles for the development of efficient and selective catalysts in hydrogenation as well as other transformations.

Recent advances in the treatment of dye-containing wastewater from textile industries: Overview and perspectives

2020-05-23

Shakiba Samsami , Maryam Mohamadizaniani , Mohammad‐Hossein Sarrafzadeh +2 more

Gold‐Katalyse

2006-11-27

A. Stephen K. Hashmi , Graham J. Hutchings

Abstract Die Katalyse durch Gold ist schnell ein “heißes Thema” der Chemie geworden – fast wöchentlich werden neue Entdeckungen gemacht. Gold ist gleichermaßen als heterogener wie auch als homogener Katalysator … Abstract Die Katalyse durch Gold ist schnell ein “heißes Thema” der Chemie geworden – fast wöchentlich werden neue Entdeckungen gemacht. Gold ist gleichermaßen als heterogener wie auch als homogener Katalysator aktiv, und im folgenden Aufsatz wollen wir diese beiden Facetten gemeinsam präsentieren, um so die vielfältigen Möglichkeiten der Gold‐Katalyse darzulegen. Die neuesten Entdeckungen werden im historischen Kontext diskutiert, Hauptziel ist aber, die neuen Optionen aufzuzeigen, die Gold‐Katalysatoren dem Synthesechemiker bieten – besonders auf den Gebieten der Redoxreaktionen und nucleophilen Additionen an π‐Systeme. Oft erweist sich Gold sogar als guter Katalysator für zuvor unbekannte Reaktionen, und in diesem Bereich gibt es mit Sicherheit noch viel zu entdecken.

Gold Catalysis

2006-11-27

A. Stephen K. Hashmi , Graham J. Hutchings

Catalysis by gold has rapidly become a hot topic in chemistry, with a new discovery being made almost every week. Gold is equally effective as a heterogeneous or a homogeneous … Catalysis by gold has rapidly become a hot topic in chemistry, with a new discovery being made almost every week. Gold is equally effective as a heterogeneous or a homogeneous catalyst and in this Review we attempt to marry these two facets to demonstrate this new found and general efficacy of gold. The latest discoveries are placed within a historical context, but the main thrust is to highlight the new catalytic possibilities that gold-catalyzed reactions currently offer the synthetic chemist, in particular in redox reactions and nucleophilic additions to pi systems. Indeed gold has proved to be an effective catalyst for many reactions for which a catalyst had not been previously identified, and many new discoveries are still expected.

Transition Metals for Organic Synthesis

2004-08-25

Correction to “Simplified Polymer Particle Design: Using Block Copolymers to Create Multi-Hollow Structures”

2025-06-25

Netnapha Kamlangmak , Thitirat Rattanawongwiboon , Hideto Minami +1 more | ACS Omega

Nanotechnology for Environmental Protection and Resource Recovery

2025-06-25

| Royal Society of Chemistry eBooks

This chapter explores the role of nanotechnology in environmental protection and resource recovery, expanding on waste management topics from previous chapters. It highlights how nanotechnology addresses challenges like water scarcity, … This chapter explores the role of nanotechnology in environmental protection and resource recovery, expanding on waste management topics from previous chapters. It highlights how nanotechnology addresses challenges like water scarcity, air pollution, energy inefficiency, and real-time air quality monitoring. The chapter delves into advanced applications such as nanostructured membranes for water purification, nanocatalysts for pollutant degradation, air filtration technologies, and nanosensors for environmental monitoring. Additionally, it outlines future innovations in nanotechnology, including its potential for improving greenhouse gas reduction and integrating with renewable energy sources. The chapter emphasizes a global and interdisciplinary approach to applying nanotechnology for sustainable development.

T-shaped Fe-based multistoichiometry stereoscopic composite catalyst with ultrahigh activity towards Fenton-like water treatment, synthesized via graphene-controlled growth

2025-06-25

NULL AUTHOR_ID | Physical Review Letters

Enhancement of Beneficial Enzyme Production in Plants and Fungi through Magnesium Nanoparticle Application: A Comprehensive Study

2025-06-24

Raghuraj Singh Chouhan , Amita Gharu Dhariwal | International Journal of Global Research Innovations & Technology (IJGRIT).

Phosphorus (P) is a critical macronutrient for plant growth, yet its availability in soil is often limited due to fixation in insoluble forms. The application of magnesium nanoparticles (MgNPs) has … Phosphorus (P) is a critical macronutrient for plant growth, yet its availability in soil is often limited due to fixation in insoluble forms. The application of magnesium nanoparticles (MgNPs) has emerged as a promising strategy to enhance phosphorus mobilization by stimulating beneficial enzymatic activity in both plant and fungal systems. This study investigates the impact of MgNPs on the secretion of phosphorus-mobilizing enzymes—particularly acid phosphatase and phytase—in five economically significant crops: cluster bean (Cyamopsis tetragonoloba), mung bean (Vigna radiata), moth bean (Vigna aconitifolia), pearl millet (Pennisetum glaucum), and sorghum (Sorghum bicolor), as well as in selected fungal species including Aspergillus niger, Trichoderma harzianum, and Penicillium chrysogenum. Application of MgNPs under controlled conditions led to a significant increase in enzymatic activities associated with phosphorus solubilization. Treated plants exhibited enhanced growth metrics—such as root development and chlorophyll content—coupled with elevated secretion of acid phosphatase and phytase enzymes in the rhizosphere. Similarly, fungi showed intensified enzyme production in response to MgNP exposure, indicating improved mineralization of organic phosphorus sources. These findings demonstrate that MgNPs significantly enhance phosphorus-mobilizing enzyme activity in both plants and fungi, thereby offering a novel approach to improving phosphorus bioavailability in agricultural soils. This work supports the potential of MgNPs as an efficient, nano-enabled tool for sustainable nutrient management, with future studies warranted to explore underlying gene regulatory mechanisms and field-scale applications.

Synthesis of Ag0 nanoparticles using hibiscusrosa-sinensis leaf extract supported on cellulose extracted from Bambusa tulda: A sustainable catalyst for the controlled acceptorless dehydrogenation of alcohols

2025-06-24

Pallab Kumar Saikia , Subrat Jyoti Borah , Mrinal Saikia +2 more | Industrial Crops and Products

A review on core shell nanoparticles: classes, synthesis, characterization of core shell nanoparticles

2025-06-24

R Anusha , Anguru Yaminikrishnaveni , Eragari Nikhitha Eragari Nikhitha +3 more | International Journal of Basic & Clinical Pharmacology

Because of their remarkable capabilities in bioimaging, targeted medication and gene delivery, sensors, and other fields, nanoparticles have many fascinating uses in a variety of fields, and the biomedical field … Because of their remarkable capabilities in bioimaging, targeted medication and gene delivery, sensors, and other fields, nanoparticles have many fascinating uses in a variety of fields, and the biomedical field is no exception. Due to a number of benefits over simple nanoparticles, it has been determined that the core/shell class of nanoparticles holds the most promise for many medicinal applications. The evolution of biomedical research based on core/shell nanoparticles during the last 20 years or so is highlighted in this study. Five main categories-bioimaging, biosensor, targeted medication delivery, DNA/RNA interaction, and targeted gene delivery-are used to categorize applications of various core/shell nanoparticle kinds.

High Turnover Frequency in the Electrocatalytic Reduction of Nitrous Oxide to Dinitrogen at a Binuclear Copper Complex of 3,5‐Diamino‐1,2,4‐Triazole

2025-06-24

Zheng Ma , Masaru Kato , Jenny Pirillo +7 more | Angewandte Chemie

Nitrous oxide (N2O) is a potent greenhouse gas and an ozone‐depleting substance. Electrocatalytic N2O reduction (e‐N2ORR) is a promising approach to remove N2O from the air under ambient conditions. However, … Nitrous oxide (N2O) is a potent greenhouse gas and an ozone‐depleting substance. Electrocatalytic N2O reduction (e‐N2ORR) is a promising approach to remove N2O from the air under ambient conditions. However, developing noble‐metal‐free e‐N2ORR electrocatalysts with high Faradaic efficiency (FE) and turnover frequency (TOF) remains a challenge because of the weak binding of N2O and the high kinetic barrier for deoxygenation reaction. In this work, inspired by the multinuclear copper active site of nitrous oxide reductases, a binuclear copper complex of 3,5‐diamino‐1,2,4‐triazole supported on carbon black of Ketjenblack (CuHdatrz/KB) was utilized for the e‐N2ORR at pH 13 and 298 K. CuHdatrz/KB achieves a high FE of ≈100% at ‐0.3 V vs. RHE for the e‐N2ORR to N2 and TOF up to ≈700 h‐1, which is one–two orders of magnitude higher than those of the previously reported molecular‐based catalysts. In situ X‐ray absorption spectroscopy confirmed that Cu(II) ions of CuHdatrz/KB are reduced to Cu(I) keeping the binuclear core, suggesting that the multinuclear copper active sites is crucial to efficiently catalyze the e‐N2ORR like the nitrous oxide reductase.

Facile synthesis of water hyacinth stem derived activated carbon modified MnO2/Fe3O4 ternary composites for efficient photocatalytic degradation of methylene blue under visible light irradiation

2025-06-24

Eneyew Tilahun Bekele , Bedasa Abdisa Gonfa , Dereje Tsegaye Leku +3 more | Materials Science and Engineering B

Zeolite-Encapsulated Transition Metal Chelation Reactions

2025-06-24

Saroj Kunwar Rathore , R. Rathore , Ritu Tomar | INTERNATIONAL JOURNAL OF MULTIDISCIPLINARY RESEARCH AND ANALYSIS

The encapsulation of transition metal complexes within zeolite frameworks has attracted significant attention due to the resulting materials’ enhanced catalytic, structural, and thermal properties. In this study, a series of … The encapsulation of transition metal complexes within zeolite frameworks has attracted significant attention due to the resulting materials’ enhanced catalytic, structural, and thermal properties. In this study, a series of triazole-based Schiff base ligands were synthesized and used to prepare metal complexes with Cu(II), Ni(II), and Fe(II), which were then encapsulated into Na–Y zeolite using the flexible ligand method. The encapsulation was carried out through ion exchange followed by coordination within the supercages of zeolite-Y. The resulting encapsulated complexes were characterized by various spectroscopic and analytical techniques including ¹H NMR, ¹³C NMR, HRMS, IR, and powder X-ray diffraction (XRD). Spectroscopic data confirmed the successful formation of metal–ligand complexes and their immobilization within the zeolite framework. IR spectroscopy indicated coordination through azomethine nitrogen and phenolic oxygen atoms. XRD analysis demonstrated that the zeolite’s crystallinity remained intact after metal loading and encapsulation, with additional diffraction lines indicating successful complex formation within the supercages. Catalytic studies on the hydroxylation of phenol using H₂O₂ as an oxidant revealed that the encapsulated metal complexes showed moderate activity with high selectivity toward catechol. Among the tested catalysts, Cu- and Fe-based systems exhibited superior performance. The encapsulated complexes were reusable with no significant loss of activity, as evidenced by similar IR and XRD profiles post-reaction.

Activated-Carbon-Supported Clusters Consisting of Four Planarly Arranged Palladium Atoms as Highly Active and Alkene-Selective Hydrogenation Catalysts

2025-06-24

Chikako Yanagisawa , Rinako Miyauchi , Risa Nishiura +4 more | ACS Catalysis

Highly Effective Removal of Ciprofloxacin from Aqueous Solution Using Graphene Oxide Functionalized Zeolite

2025-06-24

Md S Ahmmed , A. K. M. Mohiuddin | Journal of Engineering Science

Graphene oxide (GO) functionalized zeolites (ZGO) was synthesized as an adsorbent for swift and successful removal of the ciprofloxacin (CIP) antibiotic. The as-prepared nanocomposite was characterized by field emission scanning … Graphene oxide (GO) functionalized zeolites (ZGO) was synthesized as an adsorbent for swift and successful removal of the ciprofloxacin (CIP) antibiotic. The as-prepared nanocomposite was characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and RAMAN spectroscopy. The adsorption ability of ZGO for CIP was investigated at different pH (2-11), contact time (5-120 min), and adsorbent dosage (0.1-0.75 g L-1) to obtain the optimum condition for maximum removal percentage of target adsorbate. The results provided very fast (15 min only) highly effective removal of CIP (97.67%) for 0.25 g L-1 ZGO, while the pH of the aqueous solution was 7.0. Kinetic and isotherm analysis of this study indicated that the adsorption process happened on the multilayer and heterogeneous surface of ZGO and was carried out by a chemical reaction between CIP and ZGO. The highest adsorption capacity (qm) was calculated as 61.35 mg g-1 at 40°C, while 8.28 and 12.45 mg g-1 were at 20, and 30°C, respectively, which suggested the stimulation of greater sites of ZGO surface with the increment of temperatures during the adsorption process. Furthermore, strong stability and superior reusability of ZGO revealed that it could be a potential adsorbent for easy removal of CIP antibiotics from the aqueous solution. Journal of Engineering Science 15(2), 2024, 29-39

Rational Grafting of Specific Functional Groups to Heterostructured MOF Catalysts for Enhanced Hydrogenation

2025-06-24

Ting Suo , Xiang Shi , Yu Su +3 more | ACS Applied Materials & Interfaces

Grafting specific functional groups onto a host catalyst to modulate its electron density is an effective strategy for enhancing heterogeneous catalytic properties. However, introducing functional groups while preserving the host's … Grafting specific functional groups onto a host catalyst to modulate its electron density is an effective strategy for enhancing heterogeneous catalytic properties. However, introducing functional groups while preserving the host's structural integrity remains a significant challenge. Herein, a multistep strategy was employed to construct a binary MOF-on-MOF catalyst (denoted as ZIF-67-on-MIL-101s), in which specific functional groups were incorporated into the multiporous structure alongside the host MOF. The experimental and theoretical calculation results show that the specific functional group of the host MOF significantly enhances the catalytic activity, leading to ZIF-67-on-MIL-101-NH2 possessing high activity on the hydrogen transfer selectively reduce nitro-compounds under mild conditions. This approach has recently emerged as a research hotspot in the fields of chemistry and materials science.

A Review of Green Synthesis and Characterization Technique for Bismuth Ferrite Nanoparticle and Their Application

2025-06-23

T. V. Venkidesh , M. V. Manjusha | Apple Academic Press eBooks

Efficient Photocatalytic Degradation of Methylene Blue from Aqueous Solution Using Hybrid Biomass‐Derived Nanostructured Carbon‐TiO2 Photocatalyst

2025-06-23

Aman Sharma , Jyothi Mannekote Shivanna , Navneet Kumar Gupta +2 more | Chemistry - A European Journal

Industrial dye usage results in substantial wastewater discharge, posing environmental and health hazards. Hence, developing efficient, sustainable, and cost-effective treatment technologies is crucial. Photocatalysis using TiO2 has emerged as a … Industrial dye usage results in substantial wastewater discharge, posing environmental and health hazards. Hence, developing efficient, sustainable, and cost-effective treatment technologies is crucial. Photocatalysis using TiO2 has emerged as a promising approach for dye degradation. This study explores the photocatalytic removal of methylene blue (MB), a model dye pollutant, using a composite of biomass-derived carbon nanoparticles (CNPs) and nanosized TiO2 under UV light. The CNPs were synthesized via one-step pyrolysis from waste coffee leaves, offering a sustainable carbon source. The resulting carbon nanospheres (CL-10) and the TiO2-CNP composite (PC@CL-10) were thoroughly characterized using advanced techniques. Incorporating carbon significantly reduces the band gap of TiO2 from ~3.2 eV to 2.91 eV, enhancing photocatalytic activity. Degradation studies under varying catalyst doses, dye concentrations, and pH levels demonstrate effective MB removal under UV irradiation. Photocatalytic experiments revealed up to 99% degradation of MB under UV light, while tests conducted in the dark showed negligible activity, confirming the light-dependent efficiency. Kinetic analysis indicated that intra-particle diffusion governs the dye degradation process. Moreover, recyclability tests over six-cycles showed consistent performance with minimal decline, highlighting the catalyst's stability and reusability.

Green-Light Driven Reduction of Methylenemalononitriles with Formate as Reductant Without Thiol Hydrogen-Atom-Transfer Catalyst

2025-06-23

Yongqing Yang , Jialu Liu , Zheng Lu +1 more | Synthesis

The reduction of methylenemalononitriles to their corresponding methylmalononitriles represents an important transformation in organic synthesis, owing to the ready availability of these starting materials. Herein we report a safe, cost-effective, … The reduction of methylenemalononitriles to their corresponding methylmalononitriles represents an important transformation in organic synthesis, owing to the ready availability of these starting materials. Herein we report a safe, cost-effective, and practical photochemical reduction employing readily accessible organophotocatalyst and formate without thiol-mediated HAT catalyst. This method accommodates a broad substrate scope, including diverse (hetero)aryl- substituted methylenemalononitriles, delivering moderate to excellent yields.

Directing Effect of Metal–Organic Frameworks in Pt-Catalyzed Selective Hydrogenation of Unsaturated Aldehydes

2025-06-23

Huimin Jiang , Yannan Chen , Lu Zhang +6 more | ACS Catalysis

Upcycling of Fish Scales into a Au-Templated Mechanically Extractable Sturdy and Malleable Supported Catalyst for Cleansing Water

2025-06-23

Chandra S. Bhatt , Veda V. Dasari , Anil K. Suresh | ACS ES&T Water

Leaves extracts-driven synthesis of ZnO nanoparticles for enhanced adsorption of methyl red dye

2025-06-22

Haram Inam , Arjumand Iqbal Durrani , Rahila Huma +1 more | Chemical Papers

Greatly enhanced tribocatalytic purification of concentrated dye wastewater by TiO2 nanoparticles through Ti and Al2O3 coatings

2025-06-21

Yanhong Gu , Yuen Li , K. Wang +7 more | Colloids and Interface Science Communications

Nanomaterials in Chemistry Emerging Applications in Catalysis, Energy Storage (Including Lithium-Ion Batteries), and Biomedicine

2025-06-21

Amjad Ali , Noor Ul Huda Altaf , Muhammad Ismail +7 more | Scholars Academic Journal of Biosciences

Nanomaterials have gained remarkable attention in modern chemistry due to their unique size-dependent properties, large surface area, and enhanced reactivity, making them highly suitable for a wide range of advanced … Nanomaterials have gained remarkable attention in modern chemistry due to their unique size-dependent properties, large surface area, and enhanced reactivity, making them highly suitable for a wide range of advanced applications. This article presents a comprehensive review of the recent developments and applications of nanomaterials in the fields of catalysis, energy storage (with a special focus on lithium-ion batteries), and biomedicine. In catalysis, nanomaterials such as metal nanoparticles, nanostructured oxides, and carbon-based materials have shown exceptional activity and selectivity, offering improved performance in processes like photocatalysis, environmental cleanup, and industrial reactions. In energy storage, nanomaterials have significantly advanced the efficiency and capacity of lithium-ion batteries by improving electrode conductivity, increasing charge-discharge rates, and enhancing cycle life. Materials like graphene, carbon nanotubes, silicon nanostructures, and transition metal compounds are discussed for their roles in next-generation battery technologies. In the biomedical field, nanomaterials offer innovative solutions in drug delivery, bioimaging, diagnostics, and cancer treatment, owing to their ability to target specific sites, carry therapeutic agents, and respond to biological stimuli. The article also summarizes experimental findings, synthesis methods, material characterizations, and comparative performance analyses to provide a clear understanding of structure property relationships. Challenges such as toxicity, long-term stability, Environmental effects and scalability are also addressed, with suggestions for future research directions. Overall, the review highlights how nanomaterials are shaping the future of sustainable chemistry and advanced technologies across multiple sectors.

Molecular-level precise hydro-deconstruction over Al-modified dendritic mesoporous silica nanospheres supported CoMo catalysts: Alkyl positioning cracking and polycyclic aromatic preservation

2025-06-21

Shunnian Xu , K. T. Tang , Xiao Feng +2 more | Fuel

Hollow carbon spheres encapsulated with nickel nanoparticles as nanoreactors for phenol hydrogenation: unlocking confined microenvironmental effects

2025-06-21

Ping He , Yidan Nie , Miaomiao Wei +1 more | Fuel

Synergistic effect of Ru-Ni nanoparticles supported on mesoporous carbon black for highly selective hydrogenation of nitrobenzene to aniline in aqueous phase

2025-06-21

Shuo Li , Marcos Millán , Feng Gao +3 more | Fuel

Competitive Sorption of (Brilliant Cresyl Blue/Titanium Yellow) Couple on New Porous Nanocrystals Based on Cellulosic Waste: Modeling and Comparative Study

2025-06-21

Leila Chabane , Omar Bouras | International Journal of Environmental Research

Enhanced Oxidation of Carbamazepine Using Mn(II)-Activated Peracetic Acid: A Novel Advanced Oxidation Process Involving the Significant Role of Ligand Effects

2025-06-21

Xue Yang , Hai‐Bin Yu , Hong Liang +4 more | Molecules

In recent years, extensive attention has been paid to advanced oxidation processes (AOPs) with peracetic acid (PAA), a widely used disinfectant, using transition metal ions for the degradation of organic … In recent years, extensive attention has been paid to advanced oxidation processes (AOPs) with peracetic acid (PAA), a widely used disinfectant, using transition metal ions for the degradation of organic contaminants within water environments. Mn(II) has been widely used as an effective homogeneous transition metal catalyst for oxidant activation, but it has shown poor performances with PAA. Since the stability of manganese species can be enhanced through the addition of ligands, this study systematically investigated a novel AOP for the oxidation of carbamazepine (CBZ) using an Mn(II)/PAA system with several different ligands added. The reactive species were explored through UV-vis spectrometry, scavengers, and probe compounds. The results suggest that Mn(III)–ligand complexes and other high-valent Mn species (Mn(V)) were generated and contributed obviously toward efficient CBZ oxidation, while radicals like CH3CO2• and CH3CO3• were minor contributors. The oxidation efficiency of Mn(II)/PAA/ligands depended highly on ligand species, as ethylene diamine tetraacetic acid (EDTA) and oxalate (SO) could promote the oxidation of CBZ, while pyrophosphate (PPP) showed modest enhancement. The results obtained here might contribute to the removal of residue pharmaceuticals under manganese-rich waters and also shed light on PAA-based AOPs that could help broaden our present knowledge of manganese chemistry for decontamination in water treatment.

Mitigation effects and mechanism of cycle-derived carbon nanotubes on hydrogen production from oxygen- and chlorine- containing plastics mixtures in microwave catalysis

2025-06-20

Jinglin Li , Jingwen Chang , Endian Hu +6 more | Applied Catalysis B Environment and Energy

Concurrent photocatalytic degradation of organic pollutants using smart magnetically cellulose-based metal organic framework nanocomposite

2025-06-20

Nora A. El-mahdy , Sayed Rh El-Gharkawy , Magda A. Akl | Scientific Reports

Abstract Industrial activities, especially textiles and cosmetics, release harmful wastewater, threatening the environment and human health. Photocatalysis has emerged as an effective, eco-friendly solution for these issues, particularly using metal-organic … Abstract Industrial activities, especially textiles and cosmetics, release harmful wastewater, threatening the environment and human health. Photocatalysis has emerged as an effective, eco-friendly solution for these issues, particularly using metal-organic frameworks (MOFs) for water treatment. This study explores the performance, computational analysis, and mechanistic behavior of a novel magnetically responsive cellulose-based metal-organic framework (MOF) nanocomposite, DAC@PdA@FM, for the simultaneous photocatalytic degradation of Toluidine Blue O (TBO), Crystal Violet (CV), and Sunset Yellow FCF (E110) dyes. The material was synthesized using a controlled oxidation method and characterized using FTIR, XRD, EDX, SEM, TGA techniques and PPPS saturation magnetization properties. The uptake capacity of DAC@PdA@FM toward organic dyes as TBO, CV, and E110 from water, achieving reductions of 988.75, 1242.5, and 497 mg/g, respectively, within short time frames.The kinetic and isotherm studies were best fitted by PSO and the Langmuir models due to the higher correlation coefficient (R 2 ≥ 0.999) and the lower error functions. The nanocomposite exhibited enhanced reusability and separation efficiency due to its superparamagnetic nature. Density functional theory (DFT) calculations confirmed the electronic structure and charge transfer mechanisms. Comparative analysis with previous studies confirmed superior degradation efficiency. The results also suggest that the MOF: DAC@PdA@FM nanocomposite possesses notable antimicrobial activity, particularly against gram-ve bacteria. These findings suggest that the MOF: DAC@PdA@FM nanocomposite is a promising applicant for wastewater treatment applications. The catalytic degradation mechanism for dyes on the prepared MOF:DAC@PdA@FM nanocomposite involves various interactions, including electrostatic attraction, pore-filling, π–π stacking, and hydrogen bonding. Also, The results suggest that utilizing pre-prepared MOF:DAC@PdA@FM nanocomposite could serve as a potent and efficient antimicrobial agent.

Water-driven Piezocatalytic beads: a sustainable solution for the efficient removal of organic dyes and Antibiotics from wastewater

2025-06-19

Kablan Ebah , Hala Bensalah , Souad Nekhlaoui +3 more | Journal of Water Process Engineering

Catalytic degradation of metronidazole by NaBH4 reduction using Ag/Fe3O4-bentonite nanocomposite: Artificial neural network modeling

2025-06-19

Hüseyin Ecevit , Türkan Altun | Journal of Water Process Engineering

Surface Engineering of Hollow Microreactors with Catalytic Nanobrushes for Orthogonal Tandem Catalysis

2025-06-19

Shuang Wang , Huibin Qiu , Yujie Wang +5 more | Angewandte Chemie International Edition

Micro/nanoreactors with hollow structures have traditionally focused on the design of the internal catalytic microenvironment, while precise engineering of their external surfaces at a nanoscale level is particularly rare. Here, … Micro/nanoreactors with hollow structures have traditionally focused on the design of the internal catalytic microenvironment, while precise engineering of their external surfaces at a nanoscale level is particularly rare. Here, we develop a unique approach to elaborately engineer the surface of zeolitic imidazolate frameworks (ZIF‐8)‐based hollow microreactor with fluff‐like nanostructures that serve as an external catalytic platform. This involves the anchoring of high‐density micellar brushes onto the epidermis of ZIF‐8 via surface‐initiated living crystallization‐driven self‐assembly, followed by the rapid capture of multiple species to fabricate the catalytic nanobrushes. Such a nanoscale fluff‐like surface in combination with an internal cavity that encapsulates other functional components enables specific spatial isolation of various catalysts. The resultant microreactor with external PW12 nanobrushes for esterification and internal Pt‐Ni alloys for hydrogenation reveals prominent activity toward a tandem conversion of p‐nitrobenzoic acid into benzocaine with a high selectivity of 95.4%. Remarkably, the microreactor decorated with PW12 nanobrushes can greatly prompt the catalytic efficiency of esterification with the inhibited competition from the hydrogenation reaction. Overall, this work provides an innovative guidance for the rational creation of multifunctional microreactors with fine surface nanostructures.

Surface Engineering of Hollow Microreactors with Catalytic Nanobrushes for Orthogonal Tandem Catalysis

2025-06-19

Shuang Wang , Huibin Qiu , Yujie Wang +5 more | Angewandte Chemie

Facile synthesis of one-dimensional hierarchical Amino-Functionalized metal silicate micro/nanotubes with enhanced performance in adsorption and catalysis

2025-06-19

Yan Chen , Huanhuan Li , Mintong Guo +4 more | Colloids and Surfaces A Physicochemical and Engineering Aspects

Application of Physical Adsorption and Chemisorption Techniques in Heterogeneous Catalytic Research: A Review

2025-06-19

Wenting Lv , Ruihua Zhang , Fengmin Sun +7 more | Kinetics and Catalysis

Green Synthesis of Copper-Silica Nanocomposites Using Rice Husks With Antibacterial Applications

2025-06-19

Khudair Rashid Ketab , Hayder Hamied Mihsen | Deleted Journal

Syndiospecific Active Centers in a Model Catalyst System Ti(Oi-C3H7)4–Al(C2H5)2Cl/Mg(C4H9)2 Modified with 2,6-Dimethyl Pyridine

2025-06-19

Yury V. Kissin , L. A. Rishina , S. S. Lalayan +2 more | Kinetics and Catalysis

Chromium-containing Wastewater Effectively Removed by TiO2 Microsphere of Different Sizes through a Green Pathway

2025-06-18

Lin Guo , Yanhua Ding , Haiquan Xie +2 more | Surfaces and Interfaces

Highly Efficient Wastewater Treatment Using Green Synthesized MgO-Resveratrol Nanocomposite: Degradation of Crystal Violet Dye Under Blue LED Light Irradiation

2025-06-18

Dana A. Kader , Azhin H. Mohammed , Shakhawan Ahmad Mhamad +3 more | Materials Chemistry and Physics

Button-lac Mediated Preparation of Zn-Cu oxide Nanoparticles for Wastewater Treatment

2025-06-18

Sarla Yadav , Poonam Singh , Raminder Kaur | Materials Chemistry and Physics

Computational simulation of isobutylacetophenone hydrogenation catalyzed by metal single-superatom on graphene substrate

2025-06-18

Wenjie Liu , Jinrong Huo , Xiaobin Fan | Chemical Physics Letters

Recent Advances in Carbon-Based Catalysts for Heterogeneous Asymmetric Catalysis

2025-06-18

Yidan Zheng , Tianze Liu , Jingyou Tai +1 more | Molecules

Carbon materials, including graphene, carbon nanotubes, and fullerenes, serve as effective supports for catalysts and play a pivotal role in heterogeneous asymmetric catalysis due to their unique properties and ability … Carbon materials, including graphene, carbon nanotubes, and fullerenes, serve as effective supports for catalysts and play a pivotal role in heterogeneous asymmetric catalysis due to their unique properties and ability to create defined environments for catalytic reactions. Recent research has focused on developing novel carbon-based catalysts that combine the advantages of heterogeneous catalysis with enhanced stability and reusability. This review highlights the synthesis and catalytic applications of graphene, carbon nanotubes, and fullerenes as heterogeneous support materials in asymmetric organocatalytic and organometallic reactions, covering their mechanisms, efficiency, and potential for advancing sustainable chemical processes.

Hydrogenation of Nitrophenol via Nickel-Based Catalytic Membranes with Engineered Surface Affinity

2025-06-18

Yiqun Liu , Zhengyan Qu , Jiuxuan Zhang +4 more | Industrial & Engineering Chemistry Research

Biochar supported Fe–TiO2 composite for wastewater treatment: Solid-state synthesis and mechanistic insights

2025-06-18

Domenico Rosa , Rania Remmani , Irene Bavasso +2 more | Chemical Engineering Science

Magnetic and Supercapacitor applications of LiFe2O4 Nanoparticles through Sol-Gel Auto-Combustion Technique with Theoretical Representation

2025-06-18

C. Rajeevgandhi , S. Bharanidharan , L. Guganathan +4 more | Journal of the Indian Chemical Society

Polydopamine-Cross-Linked Enzyme Aggregates: Overcoming Activity Inhibition by Heavy Metals and Their Recovery and Reuse

2025-06-18

Yizhuo Lu , Xiaorong Xiong , Meishuang Qiu +3 more | ACS Sustainable Chemistry & Engineering

Synthesis of On-Demand Gold Nanoparticles with Precision Morphologies through an Automatic Feedback Control Quenching System

2025-06-18

Thi Thuy Nguyen , Hoang Khang Bui , Hiep Van Nguyen +2 more | ACS Applied Nano Materials

Efficient Electrocatalytic Hydrogenation of Nitroaromatics into Arylamines on a Pseudocrystalline MoSx Cathode in an Alkaline Electrolyte

2025-06-18

Bowen Tao , Chenyang Xu , Dedong He +5 more | ACS Sustainable Chemistry & Engineering

Synthesis of Ni-enriched hollow carbon microspheres for efficient treatment of real livestock wastewater: Mechanism insights and bio-toxicity assessment

2025-06-17

Xiaohong Liu , Chunhong Zhou , Naif Abdullah Al‐Dhabi +6 more | Chemical Engineering Journal

Bifunctional Co0.75Fe0.25@C nanocomposite towards zero waste approach: Organic pollutants removal and OER electrocatalysis

2025-06-17

Sai Rashmi Manippady , Sayali Ashok Patil , S. Akhila +5 more | Journal of environmental chemical engineering

Synthesis and Antibacterial Activity of Chitosan-Cinamaldehyde/AgNp Schiff Base Composite

2025-06-17

Muhammad Nurul Huda , Kemilau Permata Hati Rinaryadi , Ngadiwiyana Ngadiwiyana +3 more | Jurnal Kimia VALENSI

Chitosan is a material that has antibacterial properties. Chitosan was modified with cinnamaldehyde to form chitosan Schiff base, which acts as a capping agent in the synthesis of silver nanoparticles. … Chitosan is a material that has antibacterial properties. Chitosan was modified with cinnamaldehyde to form chitosan Schiff base, which acts as a capping agent in the synthesis of silver nanoparticles. The Schiff base product was modified again into a silver nanoparticle Schiff base composite to improve its ability as a capping agent and improve its antibacterial properties. This study aims to synthesize a chitosan-cinnamaldehyde/AgNP Schiff base composite (CCSB/AgNP) as an active ingredient with excellent antibacterial properties. The first stage was the synthesis of a chitosan-cinnamaldehyde Schiff base. In the second stage, the synthesis of the chitosan/AgNP composite was carried out by adding STPP with sonication and a water bath. The third stage involved synthesizing of the CCSB/AgNP composite using the same method as the second stage employing both heating and non-heating as well as sonication and non-sonication. The product was characterized using a UV-Vis spectrophotometer, FT-IR, SEM-EDX, mapping, and AAS. Antibacterial tests were performed on the synthesized product using the Total Plate Count (TPC) method. Chitosan has a molecular weight of 338080 g/mol and a degree of deacetylation of 65.09%. The Schiff base product of chitosan-cinnamaldehyde is a brownish-yellow solid with a yield of 76.9% (w/w) and a degree of substitution of 87.02%. The presence of Ag was confirmed by EDX mapping, which revealed mass percentages of 0.26%, 1.00%, and 3.97% for C/AgNP-1, C/AgNP-2, and CCSB/AgNP-2, respectively. The chitosan/AgNP product has a yield of 97% (w/w) and an SPR effect at 439 nm. The synthesis of CCSB/AgNP obtained a dark green solid with a yield of 87% (w/w) and an SPR effect at 433 nm. The antibacterial activity test yielded the highest percentage reduction in the number of bacteria in CCSB/AgNP at 3 days of observation at 95.1%, and 7 days at 94.1%.