Environmental Science › Water Science and Technology

Advanced oxidation water treatment

Works Count: 41805

Wikipedia

Description

This cluster of papers focuses on the application of Advanced Oxidation Processes (AOPs) for water and wastewater treatment, including topics such as oxidation kinetics, wastewater decontamination, peroxymonosulfate activation, Fenton reaction chemistry, electrochemical technologies, organic contaminant degradation, sulfate radical generation, and heterogeneous catalysis.

Keywords

Advanced Oxidation Processes; Water Treatment; Oxidation Kinetics; Wastewater Decontamination; Peroxymonosulfate Activation; Fenton Reaction Chemistry; Electrochemical Technologies; Organic Contaminant Degradation; Sulfate Radical Generation; Heterogeneous Catalysis

Cobalt-catalyzed sulfate radical-based advanced oxidation: A review on heterogeneous catalysts and applications

2015-07-23

Peidong Hu , Mingce Long

Advanced Oxidation Processes (AOPs) in Wastewater Treatment

2015-09-01

Yang Deng , Renzun Zhao

View PDF Chat

Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution

1988-04-01

George V. Buxton , C.L. Greenstock , W. Phillips Helman +1 more

Kinetic data for the radicals H⋅ and ⋅OH in aqueous solution,and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods. Rate constants … Kinetic data for the radicals H⋅ and ⋅OH in aqueous solution,and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods. Rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes.

Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods. An updated review

2014-11-17

Enric Brillas , Carlos A. Martínez‐Huitle

Advanced Oxidation Processes for Organic Contaminant Destruction Based on the Fenton Reaction and Related Chemistry

2006-01-01

Joseph J. Pignatello , Esther Oliveros , Allison A. MacKay

Fenton chemistry encompasses reactions of hydrogen peroxide in the presence of iron to generate highly reactive species such as the hydroxyl radical and possibly others. In this review, the complex … Fenton chemistry encompasses reactions of hydrogen peroxide in the presence of iron to generate highly reactive species such as the hydroxyl radical and possibly others. In this review, the complex mechanisms of Fenton and Fenton-like reactions and the important factors influencing these reactions, from both a fundamental and practical perspective, in applications to water and soil treatment, are discussed. The review covers modified versions including the photoassisted Fenton reaction, use of chelated iron, electro-Fenton reactions, and Fenton reactions using heterogeneous catalysts. Sections are devoted to nonclassical pathways, by-products, kinetics and process modeling, experimental design methodology, soil and aquifer treatment, use of Fenton in combination with other advanced oxidation processes or biodegradation, economic comparison with other advanced oxidation processes, and case studies.

A review of imperative technologies for wastewater treatment I: oxidation technologies at ambient conditions

2003-07-16

Parag R. Gogate , Aniruddha B. Pandit

Dark and photoassisted iron(3+)-catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxide

1992-05-01

Joseph J. Pignatello

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDark and photoassisted iron(3+)-catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxideJoseph J. PignatelloCite this: Environ. Sci. Technol. 1992, 26, 5, 944–951Publication Date (Print):May 1, 1992Publication History Published … ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDark and photoassisted iron(3+)-catalyzed degradation of chlorophenoxy herbicides by hydrogen peroxideJoseph J. PignatelloCite this: Environ. Sci. Technol. 1992, 26, 5, 944–951Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.org/doi/10.1021/es00029a012https://doi.org/10.1021/es00029a012research-articleACS PublicationsRequest reuse permissionsArticle Views2884Altmetric-Citations934LEARN 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 Get e-Alerts

Electro-Fenton Process and Related Electrochemical Technologies Based on Fenton’s Reaction Chemistry

2009-10-19

Enric Brillas , Ignasi Sirés , Mehmet A. Oturan

ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTElectro-Fenton Process and Related Electrochemical Technologies Based on Fenton's Reaction ChemistryEnric Brillas†, Ignasi Sirés†, and Mehmet A. Oturan*‡View Author Information Laboratori d'Electroquímica dels Materials i del Medi … ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTElectro-Fenton Process and Related Electrochemical Technologies Based on Fenton's Reaction ChemistryEnric Brillas†, Ignasi Sirés†, and Mehmet A. Oturan*‡View Author Information Laboratori d'Electroquímica dels Materials i del Medi Ambient, Departament de Química Física, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain and Université Paris-Est, Laboratoire Géomatériaux et Géologie de l'Ingénieur, 5 Bd Descartes, 77454 Marne-la-Vallée Cedex 2, France* To whom correspondence should be addressed. E-mail: [email protected]†Universitat de Barcelona.‡Université Paris-Est.Cite this: Chem. Rev. 2009, 109, 12, 6570–6631Publication Date (Web):October 19, 2009Publication History Received4 April 2009Published online19 October 2009Published inissue 9 December 2009https://pubs.acs.org/doi/10.1021/cr900136ghttps://doi.org/10.1021/cr900136greview-articleACS PublicationsCopyright © 2009 American Chemical SocietyRequest reuse permissionsArticle Views34100Altmetric-Citations2705LEARN 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:Electrochemical cells,Electrodes,Mineralization,Oxidation,Pest control Get e-Alerts

Identification of Sulfate and Hydroxyl Radicals in Thermally Activated Persulfate

2009-05-06

Chenju Liang , Hsin-Wey Su

Thermal activation can induce persulfate (S2O82−) degradation to form sulfate radicals (SO4−•) that can undergo radical interconversion to form hydroxyl radicals (HO•) under alkaline conditions. The radicals SO4−•/HO• can be … Thermal activation can induce persulfate (S2O82−) degradation to form sulfate radicals (SO4−•) that can undergo radical interconversion to form hydroxyl radicals (HO•) under alkaline conditions. The radicals SO4−•/HO• can be present either individually or simultaneously in the persulfate oxidation system. To identify the active radical species, a chemical probe method was developed. An excess of probe compounds was added to the system, and differences between the reactivity of the probes and the potential radical species were observed. The usage of various probes, including tert-butyl alcohol, phenol, and nitrobenzene (NB), for simultaneously identifying SO4−•/HO• was investigated. NB can only react with radicals: it cannot react with persulfate. The reaction rate of NB with HO• is 3000−3900 times greater than that of NB with SO4−•, which is a good candidate for use as a probe for differentiating between SO4−•/HO• reactivity. Furthermore, the effects of pH on the formation of SO4−•/HO• were demonstrated by the degradation kinetics of NB at varying pH values. The results indicated that SO4−• is the predominant radical at pH <7; both SO4−• and HO• are present at pH 9; HO• is the predominant radical at a more basic pH (i.e., pH 12). The use of chemical probe NB is a suitable compound for differentiating HO•/SO4−• reactivity.

Catalytic ozonation and methods of enhancing molecular ozone reactions in water treatment

2003-10-11

Barbara Kasprzyk‐Hordern , Maria Ziółek , J. Nawrocki

Toxic DNA Damage by Hydrogen Peroxide Through the Fenton Reaction in Vivo and in Vitro

1988-04-29

James A. Imlay , Sherman M. Chin , Stuart Linn

Exposure of Escherichia coli to low concentrations of hydrogen peroxide results in DNA damage that causes mutagenesis and kills the bacteria, whereas higher concentrations of peroxide reduce the amount of … Exposure of Escherichia coli to low concentrations of hydrogen peroxide results in DNA damage that causes mutagenesis and kills the bacteria, whereas higher concentrations of peroxide reduce the amount of such damage. Earlier studies indicated that the direct DNA oxidant is a derivative of hydrogen peroxide whose formation is dependent on cell metabolism. The generation of this oxidant depends on the availability of both reducing equivalents and an iron species, which together mediate a Fenton reaction in which ferrous iron reduces hydrogen peroxide to a reactive radical. An in vitro Fenton system was established that generates DNA strand breaks and inactivates bacteriophage and that also reproduces the suppression of DNA damage by high concentrations of peroxide. The direct DNA oxidant both in vivo and in this in vitro system exhibits reactivity unlike that of a free hydroxyl radical and may instead be a ferryl radical.

A rapid spectrophotometric determination of persulfate anion in ISCO

2008-10-15

Chenju Liang , Chiu-Fen Huang , Nihar Mohanty +1 more

Radical Generation by the Interaction of Transition Metals with Common Oxidants

2004-05-20

George P. Anipsitakis , Dionysios D. Dionysiou

Nine transition metals were tested for the activation of three oxidants and the generation of inorganic radical species such as sulfate, peroxymonosulfate, and hydroxyl radicals. From the 27 combinations, 14 … Nine transition metals were tested for the activation of three oxidants and the generation of inorganic radical species such as sulfate, peroxymonosulfate, and hydroxyl radicals. From the 27 combinations, 14 M/Ox couples demonstrated significant reactivity toward transforming a model organic substrate such as 2,4-dichlorophenol and are further discussed here. It was found that Co(II) and Ru(III) are the best metal catalysts for the activation of peroxymonosulfate. As expected on the basis of the Fenton reagent, Fe(III) and Fe(II) were the most efficient transition metals for the activation of hydrogen peroxide. Finally, Ag(I) showed the best results toward activating persulfate. Quenching studies with specific alcohols (tert-butyl alcohol and ethanol) were also performed to identify the primary radical species formed from the reactive M/Ox interactions. The determination of these transient species allowed us to postulate the rate-determining step of the redox reactions taking place when a metal is coupled with an oxidant in aqueous solution. It was found that when Co(II), Ru(III), and Fe(II) interact with peroxymonosulfate, freely diffusible sulfate radicals are the primary species formed. The same was proven for the interaction of Ag(I) with persulfate, but in this case caged or bound to the metal sulfate radicals might be formed as well. The conjunction of Ce(III), Mn(II), and Ni(II) with peroxymonosulfate showed also to generate caged or bound to the metal sulfate radicals. A combination of sulfate and hydroxyl radicals was formed from the conjunction of V(III) with peroxymonosulfate and from Fe(II) with persulfate. Finally, the conjunction of Fe(III), Fe(II), and Ru(III) with hydrogen peroxide led primarily to the generation of hydroxyl radicals. It is also suggested here that the redox behavior of a particular metal in solution cannot be predicted based exclusively on its size and charge. Additional phenomena such as metal hydrolysis as well as complexation with other counterions present in solution might affect the thermodynamics of the overall process and are further discussed here.

Rate constants of reactions of ozone with organic and inorganic compounds in water—I

1983-01-01

J. Hoigné , H. Bader

Advanced Oxidation Processes for Wastewater Treatment: Formation of Hydroxyl Radical and Application

2011-12-02

Jian Long Wang , LE JIN XU

Advanced oxidation processes (AOPs), defined as those technologies that utilize the hydroxyl radical (·OH) for oxidation, have received increasing attention in the research and development of wastewater treatment technologies in … Advanced oxidation processes (AOPs), defined as those technologies that utilize the hydroxyl radical (·OH) for oxidation, have received increasing attention in the research and development of wastewater treatment technologies in the last decades. These processes have been applied successfully for the removal or degradation of toxic pollutants or used as pretreatment to convert recalcitrant pollutants into biodegradable compounds that can then be treated by conventional biological methods. The efficacy of AOPs depends on the generation of reactive free radicals, the most important of which is the hydroxyl radical (·OH). The authors summarize the formation reactions of ·OH and the mechanisms of pollutants degradation. They cover six types of advanced oxidation processes, including radiation, photolysis and photocatalysis, sonolysis, electrochemical oxidation technologies, Fenton-based reactions, and ozone-based processes. Controversial issues in pollutants degradation mechanism were discussed. They review the application of these processes for removal of different kinds of toxic pollutants from wastewater, including aromatic compounds, dyes, pharmaceutical compounds, and pesticides, with emphasis on the parameters assessed, removal effectiveness, and the degradation mechanisms of pollutants. The authors discuss issues associated with practical wastewater treatment and offer suggestions for the direction for future researches.

Mechanism of Base Activation of Persulfate

2010-07-16

Olha Furman , Amy L. Teel , Richard J. Watts

Base is the most commonly used activator of persulfate for the treatment of contaminated groundwater by in situ chemical oxidation (ISCO). A mechanism for the base activation of persulfate is … Base is the most commonly used activator of persulfate for the treatment of contaminated groundwater by in situ chemical oxidation (ISCO). A mechanism for the base activation of persulfate is proposed involving the base-catalyzed hydrolysis of persulfate to hydroperoxide anion and sulfate followed by the reduction of another persulfate molecule by hydroperoxide. Reduction by hydroperoxide decomposes persulfate into sulfate radical and sulfate anion, and hydroperoxide is oxidized to superoxide. The base-catalyzed hydrolysis of persulfate was supported by kinetic analyses of persulfate decomposition at various base:persulfate molar ratios and an increased rate of persulfate decomposition in D2O vs H2O. Stoichiometric analyses confirmed that hydroperoxide reacts with persulfate in a 1:1 molar ratio. Addition of hydroperoxide to basic persulfate systems resulted in rapid decomposition of the hydroperoxide and persulfate and decomposition of the superoxide probe hexachloroethane. The presence of superoxide was confirmed with scavenging by Cu(II). Electron spin resonance spectroscopy confirmed the generation of sulfate radical, hydroxyl radical, and superoxide. The results of this research are consistent with the widespread reactivity reported for base-activated persulfate when it is used for ISCO.

The Chemistry of Water Treatment Processes Involving Ozone, Hydrogen Peroxide and Ultraviolet Radiation

1987-09-01

William H. Glaze , Joon‐Wun Kang , Douglas H. Chapin

Abstract Advanced oxidation processes are defined as those which involve the generation of hydroxyl radicals in sufficient quantity to affect water purification. The theoretical and (practical yield of OH from … Abstract Advanced oxidation processes are defined as those which involve the generation of hydroxyl radicals in sufficient quantity to affect water purification. The theoretical and (practical yield of OH from O3 at high pH, 03/H202, O3/UV and H2O2/UV systems is reviewed. New data is presented which illustrates the importance of direct photolysis in the O3/UV process, the effect of the H202:03 ratio in the O3/H2O2 process, and the impact of the low extinction coefficient of H2O2 in the H202/UV process.

The constitution and fundamental properties of solids and liquids

1917-01-01

Irving Langmuir

Influence of pH on the Formation of Sulfate and Hydroxyl Radicals in the UV/Peroxymonosulfate System

2011-10-14

Yinghong Guan , Jun Ma , Xuchun Li +2 more

The influence of pH on the degradation of refractory organics (benzoic acid, BA) in UV(254 nm)/Peroxymonosulfate (UV/PMS) system was investigated. The degradation of BA was significantly enhanced at the pH … The influence of pH on the degradation of refractory organics (benzoic acid, BA) in UV(254 nm)/Peroxymonosulfate (UV/PMS) system was investigated. The degradation of BA was significantly enhanced at the pH range of 8–11, which could not be explained only by the generally accepted theory that SO4•- was converted to HO• at higher pH. A hypothesis was proposed that the rate of PMS photolysis into HO• and SO4•- increased with pH. The hypothesis was evidenced by the measured increase of apparent-molar absorption coefficient of PMS (εPMS, 13.8–149.5 M–1·cm–1) and photolysis rate of PMS with pH, and further proved by the increased quasi-stationary concentrations of both HO• and SO4•- at the pH range of 8–10. The formation of HO• and SO4•- in the UV/PMS system was confirmed mainly from the cooperation of the photolysis of PMS, the decay of peroxomonosulfate radical (SO5•-) and the conversion of SO4•- to HO• by simulation and experimental results. Additionally, the apparent quantum yield for SO4•- in the UV/PMS system was calculated as 0.52 ± 0.01 at pH 7. The conclusions above as well as the general kinetic expressions given might provide some references for the UV/PMS applications.

Advanced Oxidation Processes in Water/Wastewater Treatment: Principles and Applications. A Review

2014-02-25

Mehmet A. Oturan , Jean‐Jacques Aaron

Advanced oxidation processes (AOPs) constitute important, promising, efficient, and environmental-friendly methods developed to principally remove persistent organic pollutants (POPs) from waters and wastewaters. Generally, AOPs are based on the in … Advanced oxidation processes (AOPs) constitute important, promising, efficient, and environmental-friendly methods developed to principally remove persistent organic pollutants (POPs) from waters and wastewaters. Generally, AOPs are based on the in situ generation of a powerful oxidizing agent, such as hydroxyl radicals (•OH), obtained at a sufficient concentration to effectively decontaminate waters. This critical review presents a precise and overall description of the recent literature (period 1990–2012) concerning the main types of AOPs, based on chemical, photochemical, sonochemical, and electrochemical reactions. The principles, performances, advantages, drawbacks, and applications of these AOPs to the degradation and destruction of POPs in aquatic media and to the treatment of waters and waste waters have been reported and compared.

A review of classic Fenton’s peroxidation as an advanced oxidation technique

2003-03-01

Evy Neyens , Jan Baeyens

Electrochemical advanced oxidation processes: today and tomorrow. A review

2014-04-01

Ignasi Sirés , Enric Brillas , Mehmet A. Oturan +2 more

View PDF Chat

Combination of Advanced Oxidation Processes and biological treatments for wastewater decontamination—A review

2010-10-17

I. Oller , S. Malato , J.A. Sánchez Pérez

Electrochemical technologies in wastewater treatment

2003-12-22

Guohua Chen

A review on Fenton and improvements to the Fenton process for wastewater treatment

2013-10-29

A. Babu Ponnusami , Karuppan Muthukumar

Degradation of Organic Contaminants in Water with Sulfate Radicals Generated by the Conjunction of Peroxymonosulfate with Cobalt

2003-09-18

George P. Anipsitakis , Dionysios D. Dionysiou

A highly efficient advanced oxidation process for the destruction of organic contaminants in water is reported. The technology is based on the cobalt-mediated decomposition of peroxymonosulfate that leads to the … A highly efficient advanced oxidation process for the destruction of organic contaminants in water is reported. The technology is based on the cobalt-mediated decomposition of peroxymonosulfate that leads to the formation of very strong oxidizing species (sulfate radicals) in the aqueous phase. The system is a modification of the Fenton Reagent, since an oxidant is coupled with a transition metal in a similar manner. Sulfate radicals were identified with quenching studies using specific alcohols. The study was primarily focused on comparing the cobalt/peroxymonosulfate (Co/PMS) reagent with the traditional Fenton Reagent [Fe(II)/H2O2] in the dark, at the pH range 2.0−9.0 with and without the presence of buffers such as phosphate and carbonate. Three model contaminants that show diversity in structure were tested: 2,4-dichlorophenol, atrazine, and naphthalene. Cobalt/peroxymonosulfate was consistently proven to be more efficient than the Fenton Reagent for the degradation of 2,4-dichlorophenol and atrazine, at all the conditions tested. At high pH values, where the efficiency of the Fenton Reagent was diminished, the reactivity of the Co/PMS system was sustained at high values. When naphthalene was treated with the two oxidizing systems in comparison, the Fenton Reagent demonstrated higher degradation efficiencies than cobalt/peroxymonosulfate at acidic pH, but, at higher pH (neutral), the latter was proven much more effective. The extent of mineralization, as total organic carbon removed, was also monitored, and again the Co/PMS reagent demonstrated higher efficiencies than the Fenton Reagent. Cobalt showed true catalytic activity in the overall process, since extremely low concentrations (in the range of μg/L) were sufficient for the decomposition of the oxidant and thus the radical generation. The advantage of Co/PMS compared to the traditional Fenton Reagent is attributed primarily to the oxidizing strength of the radicals formed, since sulfate radicals are stronger oxidants than hydroxyl and the thermodynamics of the transition-metal-oxidant coupling.

Review of iron-free Fenton-like systems for activating H2O2 in advanced oxidation processes

2014-05-02

Alok D. Bokare , Wonyong Choi

Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants

1999-10-01

Jean-Marie Herrmann

Electrocoagulation (EC) — science and applications

2001-06-01

M. Yousuf A. Mollah , Robert Schennach , José R. Parga +1 more

Degradation of chlorophenols by means of advanced oxidation processes: a general review

2003-12-19

Marc Pera‐Titus , Verónica Garcı́a-Molina , Miguel Ángel Baños +2 more

Ozonation of drinking water: Part I. Oxidation kinetics and product formation

2003-02-28

Urs von Gunten

Fundamentals, present and future perspectives of electrocoagulation

2004-09-30

M. Yousuf A. Mollah , Paul Morkovsky , Jewel A. Gomes +3 more

Advanced oxidation processes (AOP) for water purification and recovery

1999-10-15

Roberto Andreozzi

Electrochemical oxidation of organic pollutants for the wastewater treatment: direct and indirect processes

2006-01-01

Carlos A. Martínez‐Huitle , Sergio Ferro

In recent years, there has been increasing interest in finding innovative solutions for the efficient removal of contaminants from water, soil and air. The present tutorial review summarizes the results … In recent years, there has been increasing interest in finding innovative solutions for the efficient removal of contaminants from water, soil and air. The present tutorial review summarizes the results of an extensive selection of papers dealing with electrochemical oxidation, which is proposed as an alternative for treating polluted wastes. Both the direct and indirect approaches are considered, and the role of electrode materials is discussed together with that of other experimental parameters.

Activated persulfate for organic chemical degradation: A review

2016-03-15

Laura W. Matzek , Kimberly E. Carter

Single and Coupled Electrochemical Processes and Reactors for the Abatement of Organic Water Pollutants: A Critical Review

2015-12-11

Carlos A. Martínez‐Huitle , Manuel A. Rodrigo , Ignasi Sirés +1 more

Traditional physicochemical and biological techniques, as well as advanced oxidation processes (AOPs), are often inadequate, ineffective, or expensive for industrial water reclamation. Within this context, the electrochemical technologies have found … Traditional physicochemical and biological techniques, as well as advanced oxidation processes (AOPs), are often inadequate, ineffective, or expensive for industrial water reclamation. Within this context, the electrochemical technologies have found a niche where they can become dominant in the near future, especially for the abatement of biorefractory substances. In this critical review, some of the most promising electrochemical tools for the treatment of wastewater contaminated by organic pollutants are discussed in detail with the following goals: (1) to present the fundamental aspects of the selected processes; (2) to discuss the effect of both the main operating parameters and the reactor design on their performance; (3) to critically evaluate their advantages and disadvantages; and (4) to forecast the prospect of their utilization on an applicable scale by identifying the key points to be further investigated. The review is focused on the direct electrochemical oxidation, the indirect electrochemical oxidation mediated by electrogenerated active chlorine, and the coupling between anodic and cathodic processes. The last part of the review is devoted to the critical assessment of the reactors that can be used to put these technologies into practice.

Generation of sulfate radical through heterogeneous catalysis for organic contaminants removal: Current development, challenges and prospects

2016-04-18

Wen‐Da Oh , Zhili Dong , Teik‐Thye Lim

Activation of Peroxymonosulfate by Benzoquinone: A Novel Nonradical Oxidation Process

2015-10-09

Yang Zhou , Jin Jiang , Yuan Gao +5 more

The reactions between peroxymonosulfate (PMS) and quinones were investigated for the first time in this work, where benzoquinone (BQ) was selected as a model quinone. It was demonstrated that BQ … The reactions between peroxymonosulfate (PMS) and quinones were investigated for the first time in this work, where benzoquinone (BQ) was selected as a model quinone. It was demonstrated that BQ could efficiently activate PMS for the degradation of sulfamethoxazole (SMX; a frequently detected antibiotic in the environments), and the degradation rate increased with solution pH from 7 to 10. Interestingly, quenching studies suggested that neither hydroxyl radical (•OH) nor sulfate radical (SO4•–) was produced therein. Instead, the generation of singlet oxygen (1O2) was proved by using two chemical probes (i.e., 2,2,6,6-tetramethyl-4-piperidinol and 9,10-diphenylanthracene) with the appearance of 1O2 indicative products detected by electron paramagnetic resonance spectrometry and liquid chromatography mass spectrometry, respectively. A catalytic mechanism was proposed involving the formation of a dioxirane intermediate between PMS and BQ and the subsequent decomposition of this intermediate into 1O2. Accordingly, a kinetic model was developed, and it well described the experimental observation that the pH-dependent decomposition rate of PMS was first-order with respect to BQ. These findings have important implications for the development of novel nonradical oxidation processes based on PMS, because 1O2 as a moderately reactive electrophile may suffer less interference from background organic matters compared with nonselective •OH and SO4•–.

A critical review on textile wastewater treatments: Possible approaches

2016-08-04

Chandrakant R. Holkar , Ananda J. Jadhav , Dipak V. Pinjari +2 more

Electrochemical advanced oxidation processes: A review on their application to synthetic and real wastewaters

2016-08-22

Francisca C. Moreira , Rui A.R. Boaventura , Enric Brillas +1 more

Application of peroxymonosulfate and its activation methods for degradation of environmental organic pollutants: Review

2016-10-19

Farshid Ghanbari , Mahsa Moradi

Wastewater treatment by means of advanced oxidation processes at basic pH conditions: A review

2017-03-20

Grzegorz Boczkaj , André Fernandes

Chemistry of persulfates in water and wastewater treatment: A review

2017-07-21

Stanisław Wacławek , Holger V. Lutze , Klaudiusz Grübel +3 more

Activation of persulfate (PS) and peroxymonosulfate (PMS) and application for the degradation of emerging contaminants

2017-11-20

Jianlong Wang , Shizong Wang

Metal-Free Carbocatalysis in Advanced Oxidation Reactions

2018-03-01

Xiaoguang Duan , Hongqi Sun , Shaobin Wang

Catalytic processes have remarkably boosted the rapid industrializations in chemical production, energy conversion, and environmental remediation. As one of the emerging applications of carbocatalysis, metal-free nanocarbons have demonstrated promise as … Catalytic processes have remarkably boosted the rapid industrializations in chemical production, energy conversion, and environmental remediation. As one of the emerging applications of carbocatalysis, metal-free nanocarbons have demonstrated promise as catalysts for green remediation technologies to overcome the poor stability and undesirable metal leaching in metal-based advanced oxidation processes (AOPs). Since our reports of heterogeneous activation of persulfates with low-dimensional nanocarbons, the novel oxidative system has raised tremendous interest for degradation of organic contaminants in wastewater without secondary contamination. In this Account, we showcase our recent contributions to metal-free catalysis in advanced oxidation, including design of nanocarbon catalysts, exploration of intrinsic active sites, and identification of reactive species and reaction pathways, and we offer perspectives on carbocatalysis for future environmental applications. The journey starts with the discovery of peroxymonosulfate (PMS) and peroxydisulfate (PDS) activation by graphene-based materials. With the systematic investigations on most carbon allotropes, for the first time the carbocatalysis for PMS or PDS activation was correlated with the pristine carbon configuration, oxygen functionality (ketonic groups), defect degree (exposed edge sites and vacancies), and dimensional structure. Moreover, an intrinsic difference in catalytic oxidation does exist between PMS and PDS activation. For example, the PMS/carbon reaction is dominated by free radicals, while PDS/carbon catalysis was unveiled as a singlet oxygen- or nonradical-based process in which the surface-activated PDS complex directly degrades the organic pollutants without relying on the generation of free radicals. Nitrogen doping significantly enhances the carbocatalysis because of the positively charged carbon domains, which strongly bind with persulfates to form reactive intermediates toward organic reactions. More importantly, N doping substantially alters the catalytic oxidation from a radical process to a nonradical pathway in PMS activation. Codoping of sulfur or boron with nitrogen at a rational level will synergistically promote the catalysis as a result of the formation of more catalytic centers by improved charge/spin redistribution of the carbon framework. Furthermore, a structure-performance relationship was established for annealed nanodiamonds with a characteristic sp3/sp2 (core/shell) hybridization, where the catalytic pathways were intimately dependent on the thickness of the graphitic shells. Interestingly, the introduction of structural defects and N dopants into the well-defined graphitic carbon framework and alteration of graphene/diamond hybrids can transform the persulfate/carbon system from a radical oxidation pathway to a nonradical pathway. Encapsulation of metal nanoparticles within carbon layers further modulates the electronic states of the interacting carbon via charge transport to increase the electron density. Overall, this Account contributes to unveiling the mist of carbocatalysis in AOPs and to summarizing the achievements of metal-free remediation. We also present future research directions on underpinning the knowledge base to facilitate the applications of nanocarbons in sustainable catalysis and environmental chemistry.

Evaluation of advanced oxidation processes for water and wastewater treatment – A critical review

2018-03-22

David B. Miklos , Christian Remy , Martin Jekel +3 more

Single Cobalt Atoms Anchored on Porous N-Doped Graphene with Dual Reaction Sites for Efficient Fenton-like Catalysis

2018-08-30

Xuning Li , Xiang Huang , Shibo Xi +7 more

The Fenton-like process presents one of the most promising strategies to generate reactive oxygen-containing radicals to deal with the ever-growing environmental pollution. However, developing improved catalysts with adequate activity and … The Fenton-like process presents one of the most promising strategies to generate reactive oxygen-containing radicals to deal with the ever-growing environmental pollution. However, developing improved catalysts with adequate activity and stability is still a long-term goal for practical application. Herein, we demonstrate single cobalt atoms anchored on porous N-doped graphene with dual reaction sites as highly reactive and stable Fenton-like catalysts for efficient catalytic oxidation of recalcitrant organics via activation of peroxymonosulfate (PMS). Our experiments and density functional theory (DFT) calculations show that the CoN4 site with a single Co atom serves as the active site with optimal binding energy for PMS activation, while the adjacent pyrrolic N site adsorbs organic molecules. The dual reaction sites greatly reduce the migration distance of the active singlet oxygen produced from PMS activation and thus improve the Fenton-like catalytic performance.

Persulfate-Based Advanced Oxidation: Critical Assessment of Opportunities and Roadblocks

2020-02-17

Jaesang Lee , Urs von Gunten , Jae‐Hong Kim

Reports that promote persulfate-based advanced oxidation process (AOP) as a viable alternative to hydrogen peroxide-based processes have been rapidly accumulating in recent water treatment literature. Various strategies to activate peroxide … Reports that promote persulfate-based advanced oxidation process (AOP) as a viable alternative to hydrogen peroxide-based processes have been rapidly accumulating in recent water treatment literature. Various strategies to activate peroxide bonds in persulfate precursors have been proposed and the capacity to degrade a wide range of organic pollutants has been demonstrated. Compared to traditional AOPs in which hydroxyl radical serves as the main oxidant, persulfate-based AOPs have been claimed to involve different in situ generated oxidants such as sulfate radical and singlet oxygen as well as nonradical oxidation pathways. However, there exist controversial observations and interpretations around some of these claims, challenging robust scientific progress of this technology toward practical use. This Critical Review comparatively examines the activation mechanisms of peroxymonosulfate and peroxydisulfate and the formation pathways of oxidizing species. Properties of the main oxidizing species are scrutinized and the role of singlet oxygen is debated. In addition, the impacts of water parameters and constituents such as pH, background organic matter, halide, phosphate, and carbonate on persulfate-driven chemistry are discussed. The opportunity for niche applications is also presented, emphasizing the need for parallel efforts to remove currently prevalent knowledge roadblocks.

Reactive species in advanced oxidation processes: Formation, identification and reaction mechanism

2020-07-04

Jianlong Wang , Shizong Wang

Decontamination of wastewaters containing synthetic organic dyes by electrochemical methods: A general review

2008-09-28

Carlos A. Martínez‐Huitle , Enric Brillas

Efficient degradation of aniline yellow dye using photo-Fenton advanced oxidation process: Optimization via central composite design

2025-06-26

Ethel Grace Mohammad , Michie Mahino , Jennelyn Mayormita +4 more | The Palawan scientist

Dyes are the coloring agents considered pollutants when combined in water bodies. This study used the photo-Fenton process, one of the advanced oxidation processes, to degrade aniline yellow dye (AYD). … Dyes are the coloring agents considered pollutants when combined in water bodies. This study used the photo-Fenton process, one of the advanced oxidation processes, to degrade aniline yellow dye (AYD). It is a primary dye that blends with any color, creating other shades of dye. Operating variables, namely initial concentration, contact time, and pH were studied in the degradation of AYD pollutants. A central composite design was applied to acquire the optimum conditions of these independent variables, resulting in the AYD degradation and eliminating up to 94.00% at pH 5 and an initial AYD concentration of 35 ppm. The removal efficiency of FeCl3 resulted in an AYD removal of 2.03 mg per gram of FeCl3 . The pseudo-first kinetic model best explained the mechanism of degradation and removal of AYD in aqueous solution. The results of the study showed that the photo-Fenton process using UV light from fluorescent lamp and Fenton’s reagents (H2O2 and FeCl3) effectively degraded AYD in water.

Organic-copper coordination drives the formation of Cu(III) intermediates: a novel pathway for peroxymonosulfate activation and quinolone antibiotics degradation

2025-06-25

Qing Zhao , Lei Zhou , Guangli Xiu | Research on Chemical Intermediates

Nanoscale zero-valent iron loaded on boron-doped coffee grounds highly efficiently activates peroxymonosulfate to degrade tetracycline

2025-06-25

Xiangyu Wang , Feng Liang , Youxue Deng +3 more | Journal of Water Process Engineering

Degradation of antibiotics by anodic oxidation (AO) and electro Fenton (EF) process - a comparative review

2025-06-25

Arnab Das , Suman Koner , Asok Adak | Journal of Environmental Management

Wastewater Treatment for Textile Dye Decolorization Using Anodic Oxidation with a Platinum Electrode in a Basic Medium

2025-06-24

Sanaa El Aggadi , Jamila El Karkouri , Mariem Ennouhi +2 more | Reaction Kinetics Mechanisms and Catalysis

The selective 3e− ORR pathway induced by differential polarization of surface -OH by adjacent heterodinuclear metals realizes the directed conversion of radicals

2025-06-24

Yu Qiao , Huajing Zhou , Lingxiang Zhao +4 more | Journal of Environmental Management

Insights into the Oxidation Mechanism and Kinetics of Dimethyl Sulfoxide by Peroxymonosulfate

2025-06-24

Xingqi Shao , Wei Feng , Wenqian Wu +3 more | Organic Process Research & Development

Enhanced Degradation of Phenol in Aqueous Solution via Persulfate Activation by Sulfur-Doped Biochar: Insights into Catalytic Mechanisms and Structural Properties

2025-06-24

Guanyu Wang , Ling-Jiang Kou , Chenghao Li +2 more | Nanomaterials

In this study, sulfur-doped biochar (SBC) was successfully synthesized using peanut shells as the raw material and sulfur powder as the sulfur source. The composition, structural characteristics, and catalytic performance … In this study, sulfur-doped biochar (SBC) was successfully synthesized using peanut shells as the raw material and sulfur powder as the sulfur source. The composition, structural characteristics, and catalytic performance of SBC in the degradation of phenol via persulfate (PDS) activation were systematically investigated. Characterization results demonstrate that the prepared SBC exhibited a typical lamellar structure with abundant pores and fissures on its surface. XPS analysis confirmed the successful incorporation of sulfur into the biochar matrix, primarily in the form of thiophene. Under the optimized condition of a 20% sulfur doping ratio, the SBC exhibited high efficiency in activating PDS, achieving a phenol degradation rate of 97%. Remarkably, the removal rate remained at 81% even after the fifth cycle, indicating excellent cyclic stability. Density functional theory (DFT) calculations and electrochemical impedance spectroscopy (EIS) measurements further revealed that sulfur doping significantly modified the electron density distribution of the biochar, reducing its surface electrochemical impedance from 32.88 Ω to 13.64 Ω. This reduction facilitated efficient electron transfer during the catalytic process. This study provides both experimental and theoretical insights into the charge distribution characteristics of sulfur-doped biochar, offering valuable references for understanding the mechanism of PDS activation by SBC.

Review and perspective of sulfate radical-based advanced oxidation processes (SR-AOPs) in the remediation of polycyclic aromatic hydrocarbon (PAHs) contaminated soil

2025-06-24

Chao Liang , Shanshan Yang , Baolin Xing +6 more | Journal of Environmental Management

Photocatalytic activation of sodium percarbonate for water pollutant purification: influencing factors, mechanisms and application prospects

2025-06-23

Yang Yang , Zhe Wang , Yi Jiang +3 more | Research on Chemical Intermediates

Active Edge Sites Engineering on Amorphous Co‐Mn Spinel‐Based Oxides for Efficient Peroxymonosulfate Activation

2025-06-23

Hua-Jie Xu , Mengyu Zhang , Qian Zhang +7 more | Angewandte Chemie International Edition

Rational modulation of edge active sites in the Fenton-like reaction, utilizing defect engineering to form efficient catalytic activity centers, is a hot topic in the heterogeneous catalysis field, yet the … Rational modulation of edge active sites in the Fenton-like reaction, utilizing defect engineering to form efficient catalytic activity centers, is a hot topic in the heterogeneous catalysis field, yet the applicability of large-scale manufacturing remains a severe challenge. Herein, a general wet-chemical approach is reported to large-scale prepare porous CoMn2O4 with abundant active edge sites for enhanced peroxymonosulfate (PMS)-based Fenton-like activation without using a template or heat treatment. The obtained Turing-type structure not only can be assembled into spatially restricted domain CoMn2O4 nanoreactors but also greatly facilitates the exposure of active edge sites with oxygen-rich vacancies in promoting PMS adsorption and interfacial charge transfer. The unique CoMn2O4/PMS system exhibited efficient and stable removal of organic pollutants with dominant non-radical (1O2) pathways and maintained a degradation rate of 99.8% within 5 minutes after seven-cycle runs. Moreover, the application prospect of the PMS-based Fenton-like process for large-scale wastewater treatment, including sulfadiazine (SD) antibiotics in real river water and real pharmaceutical wastewater, was demonstrated by the fixed-bed tower reactor and the in-situ floating water treatment device. This work will provide guidance for the development of low-cost and efficient heterogeneous PMS-activation catalysts through rational defect engineering.

Active Edge Sites Engineering on Amorphous Co‐Mn Spinel‐Based Oxides for Efficient Peroxymonosulfate Activation

2025-06-23

Hua-Jie Xu , Mengyu Zhang , Qian Zhang +7 more | Angewandte Chemie

Rational modulation of edge active sites in the Fenton‐like reaction, utilizing defect engineering to form efficient catalytic activity centers, is a hot topic in the heterogeneous catalysis field, yet the … Rational modulation of edge active sites in the Fenton‐like reaction, utilizing defect engineering to form efficient catalytic activity centers, is a hot topic in the heterogeneous catalysis field, yet the applicability of large‐scale manufacturing remains a severe challenge. Herein, a general wet‐chemical approach is reported to large‐scale prepare porous CoMn2O4 with abundant active edge sites for enhanced peroxymonosulfate (PMS)‐based Fenton‐like activation without using a template or heat treatment. The obtained Turing‐type structure not only can be assembled into spatially restricted domain CoMn2O4 nanoreactors but also greatly facilitates the exposure of active edge sites with oxygen‐rich vacancies in promoting PMS adsorption and interfacial charge transfer. The unique CoMn2O4/PMS system exhibited efficient and stable removal of organic pollutants with dominant non‐radical (1O2) pathways and maintained a degradation rate of 99.8% within 5 minutes after seven‐cycle runs. Moreover, the application prospect of the PMS‐based Fenton‐like process for large‐scale wastewater treatment, including sulfadiazine (SD) antibiotics in real river water and real pharmaceutical wastewater, was demonstrated by the fixed‐bed tower reactor and the in‐situ floating water treatment device. This work will provide guidance for the development of low‐cost and efficient heterogeneous PMS‐activation catalysts through rational defect engineering.

Continuous Once-Through Electrooxidation Treatment using Mixed Metal Oxide Anode for Bacterial Disinfection

2025-06-23

Poulomi Chandra , Anoop Verma , Aastha Palta +2 more | Research Square (Research Square)

<title>Abstract</title> A novel electrooxidation (EO) unit was investigated for disinfecting wastewater, offering a promising alternative. This study continuously treated simulated bacterial wastewater using a mixed metal oxide (MMO) anode, mimicking … <title>Abstract</title> A novel electrooxidation (EO) unit was investigated for disinfecting wastewater, offering a promising alternative. This study continuously treated simulated bacterial wastewater using a mixed metal oxide (MMO) anode, mimicking hospital ward conditions. Optimal disinfection (96% bacterial inactivation) was achieved in continuous mode at a current density of 7.14 mA/cm 2 , 0.2 g/L NaCl, 9 minutes treatment time, and 40 mL/min flow rate. Real sewage wastewater achieved 92% inactivation at 8 minutes under these conditions. The MMO anode remained durable and effective after 300 cycles. EO presents a robust and affordable technology with an electrical consumption of 0.184 kWh/m 3 and an operational cost of $1.88/m 3 . These findings suggest this EO technique is a viable approach for decentralized wastewater treatment in hospital infectious wards, with the potential for real-world application.

Catalytic Effect of Pd0 NPs Encapsulated in UiO-66(Zr) under Microenvironment Modulation for the Degradation of Trimethoprim in Fenton-like Reaction

2025-06-22

Ying Gao , Rongwei Yang , Qinqin Chen +7 more | Inorganic Chemistry

The large-scale production of iron sludge and the safety issues of H2O2 usage are two limitations in the promotion and application of the Fenton reaction. To further solve the problems, … The large-scale production of iron sludge and the safety issues of H2O2 usage are two limitations in the promotion and application of the Fenton reaction. To further solve the problems, an active hydrogen reduction strategy was proposed. Herein, the reducing property of active hydrogen was utilized to simultaneously generate H2O2 in situ and accelerate the regeneration of ferric in the reaction process. The composite metal-organic frameworks (MOFs) Pd@UiO-66(Zr) and Pd@UiO-66(Zr)-2OH, which were stable under acidic conditions, were synthesized for hydrogen activation. Under the condition of only trace amounts of ferrous and hydrogen added, both catalysts showed excellent performance in the degradation experiments of trimethoprim. The kobs of the Pd@UiO(Zr)-66-mediated system is 0.0487 min-1, which is 1.67 times that of Pd@UiO-66(Zr)-2OH. In the pollutant degradation reaction system constructed by these two materials, both of the hydroxyl radicals and singlet oxygen play a dominant role. The Bader charge analysis showed that the charge transfer from Pd to the MOF host was higher on Pd@UiO-66(Zr) than Pd@UiO-66(Zr)-2OH, which could be a key factor in distinguishing the catalytic activity of the catalysts. In addition, both catalysts showed excellent stability over six cycles. Nearly 100% degradation of trimethoprim could be achieved. This study provides some reference for the control of emerging pollutants by UiO-66(Zr) series materials.

Biochar-based catalysts: an efficient and sustainable approach for water remediation from organic pollutants via advanced oxidation processes

2025-06-21

Kosar Hikmat Hama Aziz , Fryad S. Mustafa , Mozart A. H. Karim +1 more | Journal of Environmental Management

Mechanism and Degradation Pathways of Chloramphenicol via FeSe2-Catalyzed Peroxymonosulfate Activation

2025-06-21

Jifeng Yang , Deng You , Liying Zheng +3 more | Catalysis Letters

Ligand Enhanced Sediments Oxygenation for Sulfamethoxazole Degradation: The Key Role of Dissolved Fe(II)

2025-06-20

H. Jiang , Wenjing Xie , Elias Niyuhire +5 more | Journal of environmental chemical engineering

Strongly Enhanced Degradation of Emerging Organic Contaminants by Peroxymonosulfate Oxidation: Synergistic Activation with Chloride and Trace Ferrous Ions Inducing the Formation of Highly Oxidative Species

2025-06-20

Xianglong He , Xiaojun Hu , Junhua Yun +5 more | ACS ES&T Water

Heterogeneous activation of peroxymonosulfate by sludge ceramsite for the degradation of tetracycline hydrochloride

2025-06-20

Zhenghe Xu , Huan Liang , Huali Zhang +3 more | Journal of the Taiwan Institute of Chemical Engineers

Preparation of PdCu Catalyst and the Catalytic Degradation of Methylene Blue and Rhodamine B with PMS

2025-06-20

Wei Wang , Jiaqi Liu , Guang Shi +3 more | Catalysts

Spherical Cu2O nanoparticles were obtained by reducing copper acetate in N,N-dimethylformamide (DMF) system using glucose as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant, with which spherical PdCu nanocatalysts … Spherical Cu2O nanoparticles were obtained by reducing copper acetate in N,N-dimethylformamide (DMF) system using glucose as the reducing agent and polyvinylpyrrolidone (PVP) as the surfactant, with which spherical PdCu nanocatalysts were thus synthesized by disproportionation. The catalyst was used for the activation of peroxymonosulfate (PMS) and showed an excellent degradation effect on rhodamine B and methylene blue-contained printing and dyeing wastewater with good stability. Additionally, the surface morphology analysis of the catalyst was carried out by SEM and TEM. The structure was characterized by XRD and FT-IR. The valence state and composition of the catalyst were characterized by XPS. The catalytic performance of the prepared catalysts was investigated with methylene blue and rhodamine B used as target pollutants. The results showed that the catalytic reduction efficiency of PdCu nanocatalyst for the two pollutants could reach 99% at 20 °C, when catalyst concentration was 60 mg/L and PMS concentration was 1.0 g/L and 0.6 g/L, respectively. The degradation efficiency of the catalyst was significantly reduced when Cl−, HCO3− and HA were present in the water. The degradation efficiency was above 90% when the pH was in the range of 5–11. The excellent performance of the PdCu/PMS system in the treatment of RhB-contained wastewater was further confirmed by taking into account of the data of free radical quenching experiment and the results of electron paramagnetic resonance (EPR) experiment. After three cycles, the removal rate of MB and RhB could still be maintained at more than 90%, which proved its excellent recyclability due to its remarkable stability and efficiency.

Sulfate Radical-Based Oxidation Processes for Emerging Contaminants: Advances and Perspectives on Degradation of Hormones

2025-06-20

Camila Soares Silvestre Tolêdo , Daniele Maia Bila , Juacyara Carbonelli Campos | Processes

The increasing presence of emerging contaminants in aquatic environments, particularly endocrine disruptors (EDs), has raised significant environmental and public health concerns due to their toxicity, persistence, and ability to interfere … The increasing presence of emerging contaminants in aquatic environments, particularly endocrine disruptors (EDs), has raised significant environmental and public health concerns due to their toxicity, persistence, and ability to interfere with the endocrine systems of both aquatic organisms and humans. Among these compounds, the steroid hormones 17β-estradiol (E2) and 17α-ethinylestradiol (EE2) stand out, as they are frequently detected in wastewater, even after conventional treatment processes, which often exhibit limited removal efficiency. In this context, advanced oxidation processes (AOPs), especially those based on the generation of sulfate radicals (SO4•−), have emerged as promising alternatives due to their high redox potential, extended half-life, and broad effectiveness across various pH levels. This work reviews recent advances in AOPs for the degradation of E2 and EE2, focusing on sulfate radical-based processes. The main degradation mechanisms, operational parameters, removal efficiency, challenges for large-scale application, and gaps in the current literature are discussed. The analysis indicates that despite their high effectiveness, sulfate radical-based processes still require further investigation in real wastewater matrices, the assessment of the toxicity of by-products, and the optimization of operational variables to be established as viable and sustainable technologies for wastewater treatment.

Activation of O2 within confined ultramicropores of carbon electrocatalyst for enhanced electrochemical oxidation of water contaminants

2025-06-20

Mingming Wu , Yixiao Pan , Liang-Long Xing +2 more | Journal of Hazardous Materials

Ultrasound‐assisted degradation of Procion Brilliant Orange M‐<scp>2R</scp> dye using ultrasonic flow cell combined with oxidants

2025-06-19

Rahat F. Momin , Parag R. Gogate | Journal of Chemical Technology & Biotechnology

Abstract BACKGROUND The current research investigates the degradation of Procion Brilliant Orange M‐2R utilizing an ultrasonic (US) flow cell in conjunction with oxidants. The treatment scheme involved optimizing the pH … Abstract BACKGROUND The current research investigates the degradation of Procion Brilliant Orange M‐2R utilizing an ultrasonic (US) flow cell in conjunction with oxidants. The treatment scheme involved optimizing the pH (3–8), operating power (750–1200 W) and recirculation flow rate (200–800 mL min −1 ) to achieve maximum decolorization through the use of only the US flow cell followed by combination studies with various oxidants for intensification. RESULTS The highest decolorization attained was 74.7%, while mineralization reached 24.6% using an individual US flow cell under optimum conditions of initial concentration of dye of 20 ppm, pH of 3, power of 1200 W and circulating flow rate of 400 mL min −1 . Subsequently, the efficacy of various combinations of the US flow cell with oxidants, specifically US + H 2 O 2 , US + Fenton's reagent, US + potassium persulfate (KPS) and US + FeSO 4 ⋅7H 2 O + KPS, was studied confirming that higher decolorization of 93%, 93.8%, 92.4% and 95.5% for those combinations, respectively, was obtained. The decolorization followed second‐order kinetics across all methods employed, and the obtained rate constants confirmed the synergism for the combinations. Toxicity assessments, alongside high‐resolution liquid chromatography–mass spectrometry analysis, demonstrated that no toxic intermediates were introduced into the reaction mixture during the treatment. Cavitational yield and treatment cost were also estimated to compare various approaches used in the work. CONCLUSION Overall, the combination of the US flow cell with FeSO 4 ⋅7H 2 O and KPS demonstrated maximum efficacy in degrading Procion Brilliant Orange M‐2R dye. © 2025 Society of Chemical Industry (SCI).

Efficient removal of metronidazole by ball milling synthesized graphite-doped pyrite activation of persulfate

2025-06-19

Lei Xie , Kuang Wang | Next Materials

Removal of butyl xanthate and Cr(Ⅵ) using FeNi-biochar

2025-06-19

Shouhua Feng , Kejun Bi , T. Cui +1 more | Arabian Journal of Chemistry

Bimetallic MOFs-derived CuS/FeMn-C composite materials efficiently activate persulfate for catalytic degradation of ciprofloxacin

2025-06-19

Lanting Wu , Yanyan Liu , Tianyu Shi +3 more | Journal of the Taiwan Institute of Chemical Engineers

Degradation of Organophosphorus Pollutants into Inorganic Phosphates by Co(II)/NaBO3 System and Its Phosphorus Recycling

2025-06-19

Huan Luo , Xiaohong Liu , Huibin Niu +7 more | Inorganic Chemistry

With the increase of demand of phosphorus resources and its natural shortage, circulating utilization of organophosphorus contaminants into phosphatic fertilizer could provide a sustainable way to achieve the phosphorus cycle. … With the increase of demand of phosphorus resources and its natural shortage, circulating utilization of organophosphorus contaminants into phosphatic fertilizer could provide a sustainable way to achieve the phosphorus cycle. Herein, a homogeneous catalytic system of Co(II)/sodium peroxyborate (NaBO3·4H2O, SPB) was developed for the degradation of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) and glyphosate (PMG) into inorganic phosphate (o-PO43-). The Co(II)/SPB system maintained excellent catalytic performance for HEDP degradation under a broad initial pH range (2.91-11.01) due to its self-regulating pH phenomenon. Trapping experiments, quantitative experiments, and supplementary techniques suggested that the HEDP degradation was mainly affected by the combined action of free radical species (•OH and O2•-) and nonradical species (Co(III) and 1O2). More importantly, the Co(II)/SPB system also exhibited excellent catalytic performance in the treatment of actual glyphosate wastewater with 11.0% decrease in total organic carbon (TOC), 55.4% decrease in chemical oxygen demand (COD) after 60 h, and the o-PO43- formation of 66.5 μM, which had been further transformed into struvite (phosphate fertilizer) with an 84.75% yield. In addition, germination experiments demonstrated that the biotoxicity of glyphosate to wheat seed was greatly reduced after treatment by the Co(II)/SPB system.

Enhanced performance of tourmaline-catalyzed ozonation-anoxic-oxic system for poly (butylene adipate-co-terephthalate) (PBAT) wastewater treatment under shock loads

2025-06-18

Changwen Xu , Geng Juan , Chunhua He +4 more | Journal of Water Process Engineering

Mn-doped copper slag with oxygen vacancies boosts peroxymonosulfate activation for ofloxacin rapid removal

2025-06-18

Linjin Li , Yaoze Wang , Guangfei Qu +7 more | Journal of Water Process Engineering

Hydrochar as sustainable redox catalyst for advanced oxidation processes-based wastewater treatment

2025-06-17

Ganapaty Manickavasagam , Mardiana Saaid , Wen‐Da Oh | Pure and Applied Chemistry

Abstract Hydrochar-based catalysts (HBCs) are one example of carbon-based catalysts and four forms of hydrochar-based catalysts have been reported in environmental remediation, including pristine hydrochar (HC), heteroatom-doped hydrochar (HA-HC), metal-doped … Abstract Hydrochar-based catalysts (HBCs) are one example of carbon-based catalysts and four forms of hydrochar-based catalysts have been reported in environmental remediation, including pristine hydrochar (HC), heteroatom-doped hydrochar (HA-HC), metal-doped hydrochar (M-HC), and metal-heteroatom co-doped hydrochar (M-HA-HC). However, research on HBCs and their catalytic performance in advanced oxidation processes remains limited and this is attributed to low specific surface area and poor porosity, low aromatization and carbonization degrees, and inadequacy of literature on its production methods for enhanced advanced oxidation processes (AOPs). Herein, we aimed to discuss the activation mechanisms of the selected oxidants ( i.e. , peroxymonosulfate (PMS), peroxydisulfate (PDS), ozone (O 3 ), and hydrogen peroxide (H 2 O 2 )) by different HBCs, characteristics of emerging pollutants, and synthesis conditions ( i.e. , biomass type, temperature and residence time, reaction solvent, in situ air stream, post-treatment, and external dopants) that influence the desirable properties of catalysts, comprehensively highlighting their enhanced potential as effective activators for AOPs-based wastewater treatment.

Application of Response Surface Methodology for the Optimization of Basic Red 46 Dye Degradation in an Electrocoagulation–Ozonation Hybrid System

2025-06-17

Trong Nghia-Nguyen , Vinh Dinh Nguyen | Molecules

The release of synthetic dyes like Basic Red 46 (BR46) from industrial wastewater has raised growing concerns due to their toxicity, long-term persistence, and resistance to standard biological treatment methods. … The release of synthetic dyes like Basic Red 46 (BR46) from industrial wastewater has raised growing concerns due to their toxicity, long-term persistence, and resistance to standard biological treatment methods. In this work, we developed and tested a pilot-scale electrocoagulation-ozonation (EC-O) hybrid system aimed at removing BR46 from aqueous solutions. The system integrates electrocoagulation, using iron electrodes, with ozone-based advanced oxidation processes, facilitating a combination of coagulation, adsorption, and oxidative breakdown of dye molecules. The response surface methodology (RSM) with a central composite design (CCD) was applied to optimize the treatment process, focusing on five variables: current density, flow rate, ozone dosage, ozonation time, and initial dye concentration. The quadratic model exhibited strong predictive power, with an adjusted R2 of 0.9897 and a predicted R2 of 0.9812. The optimal conditions identified included a current density of 70 A/m2, flow rate of 1.6 L/min, ozone dose of 2.0 g/h, and an ozonation time of 20 min, achieving a predicted removal efficiency of 91.67% for a solution with BR46 at an initial concentration of 300 mg/L. Experiments conducted under these conditions confirmed the model's reliability, with observed removal rates exceeding 90% and deviations under 2%. The EC-O system had a treatment capability of 26.19 L/h and an energy consumption of 3.04 kWh/m3. These findings suggest that the EC-O system is an effective and scalable option for treating dye-contaminated wastewater, offering faster and more efficient results than conventional techniques.

Stimulation of peroxymonosulfate using nickel ferrite nanoparticles for the degradation of Lomefloxacin hydrochloride and caffeine

2025-06-17

Indumathi Ilango , Raj Mohan Balakrishnan , Chettiyappan Visvanathan +1 more | Nanotechnology for Environmental Engineering

Integration of membrane distillation with heat-activated peroxymonosulfate for ciprofloxacin removal and municipal wastewater treatment

2025-06-16

Ruwanthi Ranaweera , Xing Wu , Muhammad Wahyu Nugraha +4 more | Journal of Water Process Engineering

Ni-EDTA decomplexation and Ni removal from wastewater by electrooxidation coupled with electrocoagulation: Optimization, mechanism and biotoxicity assessment

2025-06-16

Jiuhui Qu , Jieling Liu , Naif Abdullah Al‐Dhabi +6 more | Separation and Purification Technology

Energy-Efficient Electrochemical Degradation of Organic Pollutants by Three-Dimensional Anode Packed with C/Sn–Sb Composite Particles

2025-06-16

Yuping Wu , Wei Meng , Fei Feng +4 more | Industrial & Engineering Chemistry Research

Enhanced bisphenol S degradation via peroxymonosulfate activation using zeolitic imidazolate framework-67 (co)-embedded alginate beads

2025-06-16

Thanh-Binh Nguyen , Nithya Mariappan , Chiu‐Wen Chen +3 more | Journal of Water Process Engineering

Enhanced treatment of reclaimed water contaminated with emerging contaminants using a flow-through Fenton-like reactor based on nanoconfinement effects

2025-06-16

Chao Wang , Zhipeng Pei , Gang Zhou +4 more | Journal of Cleaner Production

Degradation of oxytetracycline using hydroxyl radicals produced by metastable aluminium ions

2025-06-15

Xiao-Han Guo , Xinyan Wang , Gen-Wang Ma +4 more | Environmental Technology

In this work, a new homogenous Fenton-like reaction, using metastable aluminium ions ([Al(H2O)63+]∗), was adopted to decompose H2O2 into HO• and degrade OTC in an aqueous solution. It was found … In this work, a new homogenous Fenton-like reaction, using metastable aluminium ions ([Al(H2O)63+]∗), was adopted to decompose H2O2 into HO• and degrade OTC in an aqueous solution. It was found that [Al(H2O)63+]∗ ions can efficiently degrade and mineralize OTC across a wide pH range of 2.5-12.0 without precipitates. Under optimal conditions, OTC can be degraded within ∼10 min, and >60% of total organic carbon (TOC) was removed after reaction for 24 h. Even in a neutral solution, the degradation ratio of OTC can be up to ∼80%. Meanwhile, [Al(H2O)63+]∗ ions exhibited good recyclability, with no significant decrease in the degradation efficiency of OTC even up to six cycles. The reaction byproducts were determined, which indicates that the pathway of OTC degradation in [Al(H2O)63+]∗ solution includes decarbonylation, hydroxylation and dehydration. The present study provides a new homogeneous method to remove OTC in the aqueous solution.

The γ-MnO2/NF mediated peroxymonosulfate activation for expeditious 2,4,6-trichlorophenol degradation: performance, pathways, and mechanism

2025-06-15

Ranyun Xu , Qing Shen , Lyujun Chen | Frontiers of Environmental Science & Engineering

Insights into the enhanced calcium sulfite oxidation by air assisted with manganese/cigarette filter-based porous carbon catalysts: Valence cycle and radical/non-radical synergistic pathways

2025-06-15

Peng Yang , Qiaoling Zeng , Liuchun Yang | Fuel

Unexpected tetracycline antibiotics degradation in the Fenton process under near-neutral pH conditions: Performance and mechanism

2025-06-14

Hongyu Dong , Yimin Lin , Mingyang Feng +5 more | Journal of Hazardous Materials

Synergistic treatment of extracellular polymeric substances in Chlorella vulgaris recycled wastewater using Fenton oxidation coupled with granular activated carbon adsorption

2025-06-14

Yufei Zhang , Xinyu Wen , Yanlin Zhang +7 more | Bioresource Technology

Inhibition by Dissolved Organic Matter of the Degradation of Purine Compounds by the Sulfate Radical

2025-06-14

Shuangshuang Cheng , Rui Cui , Jinpeng Yu +2 more | Water Research

HKUST-1(Cu)-derived ZnCuOx@C with rich oxygen vacancies as an efficient peroxymonosulfate activator for bisphenol a degradation: Eco-friendly, catalytic activity and mechanism

2025-06-14

Wenjun Zhu , Z. Q. Hu , Xin Li +5 more | Colloids and Surfaces A Physicochemical and Engineering Aspects

Tandem “heterogeneous catalysis/biological degradation” optimization for the treatment of recalcitrant compounds in industrial streams

2025-06-13

Laura G. Covinich , Paola Massa , A.M. Ferro Orozco +2 more | Journal of Water Process Engineering