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Liu B, Wei J, Zhang S, Shad A, Tang X, Allam AA, Wang Z, Qu R. Insights into oxidation of pentachlorophenol (PCP) by low-dose ferrate(VI) catalyzed with α-Fe 2O 3 nanoparticles. JOURNAL OF HAZARDOUS MATERIALS 2023; 458:131983. [PMID: 37406528 DOI: 10.1016/j.jhazmat.2023.131983] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 06/08/2023] [Accepted: 06/30/2023] [Indexed: 07/07/2023]
Abstract
In this study, the catalytic performance of α-Fe2O3 nanoparticles (nα-Fe2O3) in the low-dose ferrate (Fe(VI)) system was systematically studied through the degradation of pentachlorophenol (PCP). Based on the established quadratic functions between nα-Fe2O3 amount and observed pseudo first-order rate constant (kobs), two linear correlation equations were offered to predict the optimum catalyst dosage and the maximum kobs at an applied Fe(VI) amount. Moreover, characterization and cycling experiments showed that nα-Fe2O3 has good stability and recyclability. According to the results of reactive species identification and quenching experiment and galvanic oxidation process, the catalytic mechanism was proposed that Fe(III) on the surface of nα-Fe2O3 may react with Fe(VI) to enhance the generation of highly reactive Fe(IV)/Fe(V) species, which rapidly extracted a single electron from PCP molecule for its further reaction. Besides, two possible PCP degradation pathways, i.e., single oxygen transfer mediated hydroxylation and single electron transfer initiated polymerization were proposed. The formation of coupling products that are prone to precipition and separation was largely improved. This study proved that nα-Fe2O3 can effectively catalyze PCP removal at low-dose Fe(VI), which provides some support for the application of Fe(VI) oxidation technology in water treatment in the context of low-carbon emissions.
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Affiliation(s)
- Boying Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Junyan Wei
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Shengnan Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Asam Shad
- Department of Environmental Sciences, Comsats University, Abbottabad Campus, Islamabad, Pakistan
| | - Xiaosheng Tang
- Jiangsu Yangtze River Delta Environmental Science and Technology Research Institute Co., Ltd., Changzhou 213100, Jiangsu, PR China
| | - Ahmed A Allam
- Department of Zoology, Faculty of Science, Beni-suef University, Beni-suef 65211, Egypt
| | - Zunyao Wang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
| | - Ruijuan Qu
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
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Bui HT, Weon S, Bae JW, Kim EJ, Kim B, Ahn YY, Kim K, Lee H, Kim W. Oxygen vacancy engineering of cerium oxide for the selective photocatalytic oxidation of aromatic pollutants. JOURNAL OF HAZARDOUS MATERIALS 2021; 404:123976. [PMID: 33080555 DOI: 10.1016/j.jhazmat.2020.123976] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/26/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
The engineering of oxygen vacancies in CeO2 nanoparticles (NPs) allows the specific fine-tuning of their oxidation power, and this can be used to rationally control their activity and selectivity in the photocatalytic oxidation (PCO) of aromatic pollutants. In the current study, a facile strategy for generating exceptionally stable oxygen vacancies in CeO2 NPs through simple acid (CeO2-A) or base (CeO2-B) treatment was developed. The selective (or mild) PCO activities of CeO2-A and CeO2-B in the degradation of a variety of aromatic substrates in water were successfully demonstrated. CeO2-B has more oxygen vacancies and exhibits superior photocatalytic performance compared to CeO2-A. Control of oxygen vacancies in CeO2 facilitates the adsorption and reduction of dissolved O2 due to their high oxygen-storage ability. The oxygen vacancies in CeO2-B as active sites for oxygen-mediated reactions act as (i) adsorption and reduction reaction sites for dissolved O2, and (ii) photogenerated electron scavenging sites that promote the formation of H2O2 by multi-electron transfer. The oxygen vacancies in CeO2-B are particularly stable and can be used repeatedly over 30 h without losing activity. The selective PCOs of organic substrates were studied systematically, revealing that the operating mechanisms for UV-illuminated CeO2-B are very different from those for conventional TiO2 photocatalysts. Thus, the present study provides new insights into the design of defect-engineered metal oxides for the development of novel photocatalysts.
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Affiliation(s)
- Hoang Tran Bui
- Department of Chemical and Biological Engineering, Research Institute of Global Environment, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Seunghyun Weon
- School of Health and Environmental Science, Korea University, Seoul 02841, Republic of Korea
| | - Ji Won Bae
- Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Republic of Korea
| | - Eun-Ju Kim
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Bupmo Kim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Yong-Yoon Ahn
- Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of Korea
| | - Kitae Kim
- Korea Polar Research Institute (KOPRI), Incheon 21990, Republic of Korea
| | - Hangil Lee
- Department of Chemistry, Sookmyung Women's University, Seoul 140-742, Republic of Korea.
| | - Wooyul Kim
- Department of Chemical and Biological Engineering, Research Institute of Global Environment, Sookmyung Women's University, Seoul 140-742, Republic of Korea.
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Bhat AP, Gogate PR. Degradation of nitrogen-containing hazardous compounds using advanced oxidation processes: A review on aliphatic and aromatic amines, dyes, and pesticides. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123657. [PMID: 33264866 DOI: 10.1016/j.jhazmat.2020.123657] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/29/2020] [Accepted: 08/01/2020] [Indexed: 06/12/2023]
Abstract
Nitrogen-containing amino and azo compounds are widely used in textile, agricultural and chemical industries. Most of these compounds have been demonstrated to be resistant to conventional degradation processes. Advanced oxidation processes can be effective to mineralize nitrogen-containing compounds and improve the efficacy of overall treatment schemes. Due to a global concern for the occurrence of toxic and hazardous amino-compounds and their harmful degradation products in water, it is important to develop technologies that focus on all the aspects of their degradation. Our focus is to present a state-of-the-art review on the degradation of several amine- and azo-based compounds using advanced oxidation processes. The categories reviewed are aromatic amines, aliphatic amines, N-containing dyes and N-containing pesticides. Data has been compiled for degradation efficiencies of each process, reaction mechanisms focusing on specific attack of oxidants on N atoms, the effect of process parameters like pH, initial concentration, time of treatment, etc. and identification of intermediates. Several AOPs have been compared to provide a systematic overview of available literature that will drive essential aspects of future research on amine-based compounds. Ozone is observed to be highly reactive to most amines, dyes and pesticides, followed by Fenton processes. Degradation of amines is highly sensitive to pH and mechanisms differ at different pH values. Cavitation is a promising alternative pre-treatment method for cost reduction. Hybrid methods under optimized conditions are demonstrated to give synergistic effects and must be tailored for specific effluents in question. In conclusion, even though nitrogen-containing compounds are recalcitrant in nature, the use of advanced oxidation processes at carefully established optimum conditions can yield highly efficient degradation of the compounds.
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Affiliation(s)
- Akash P Bhat
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, 400019, India
| | - Parag R Gogate
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga, Mumbai, 400019, India.
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Guo Y, Ma R, Liu W, Hao L, Wu Q, Wang Z. Facile synthesis of conjugated microporous polymer with spherical structure for solid phase extraction of phenyl urea herbicides. J Chromatogr A 2020; 1622:461131. [DOI: 10.1016/j.chroma.2020.461131] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 04/09/2020] [Accepted: 04/12/2020] [Indexed: 02/06/2023]
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Ji D, Xue R, Zhou M, Zhu Y, Zhang F, Zang L. Preparation and photocatalytic performance of tungstovanadophosphoric heteropoly acid salts. RSC Adv 2019; 9:18320-18325. [PMID: 35515250 PMCID: PMC9064807 DOI: 10.1039/c9ra00652d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 05/31/2019] [Indexed: 11/21/2022] Open
Abstract
Tungstovanadophosphoric heteropoly acid H5PW10V2O40·5.76H2O (HPWV) has been synthesized via stepwise acidification and gradual addition of elements. Some metals like Fe, Al and Cu were introduced into the heteropoly acid (HPA) in the molar ratio of 10 : 6, 10 : 6 and 10 : 4 respectively. The prepared catalysts were characterized by UV, FTIR, TG/DTA and XRD. The results indicated that HPWV and its metal salts all contain Keggin units, which are the primary structures of the heteropoly acids. The homogeneous photocatalytic degradation of phenol by heteropoly acid salts was studied in detail under artificial UV irradiation and addition of hydrogen peroxide (H2O2), and the effects of initial phenol and H2O2 concentrations on the rate of photocatalytic phenol degradation were examined. The results suggested that the heteropoly acid salts showed good catalytic activities for phenol degradation via the ·OH radical mechanism. Under irradiation with a 10 W Hg lamp, 96% phenol was degraded within less than 60 min in the solution containing 50 mg L−1 phenol + 2 μmol L−1 Fe5(PW10V2O40)3 + 4 μmol L−1 H2O2, with the performance of the catalysts in order FePWV > AlPWV > CuPWV > HPWV. This work demonstrated that the photo-Fenton reaction catalyzed by the heteropoly acid salts was a promising advanced oxidation tool for the treatment of phenol-containing wastewater. Tungstovanadophosphoric heteropoly acid H5PW10V2O40·5.76H2O (HPWV) has been synthesized via stepwise acidification and gradual addition of elements.![]()
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Affiliation(s)
- Dandan Ji
- College of Environmental Science and Engineering
- Qilu University of Technology (Shandong Academy of Science)
- Jinan
- China 250353
- Huatai Group
| | - Rong Xue
- College of Environmental Science and Engineering
- Qilu University of Technology (Shandong Academy of Science)
- Jinan
- China 250353
| | - Maojuan Zhou
- College of Environmental Science and Engineering
- Qilu University of Technology (Shandong Academy of Science)
- Jinan
- China 250353
| | - Ying Zhu
- Advanced Material Institute
- Qilu University of Technology (Shandong Academy of Science)
- Jinan
- China 250014
| | | | - Lihua Zang
- College of Environmental Science and Engineering
- Qilu University of Technology (Shandong Academy of Science)
- Jinan
- China 250353
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Gao T, Wang J, Hao L, Yang X, Wang C, Wu Q, Wang Z. A magnetic knitting aromatic polymer as a new sorbent for use in solid-phase extraction of organics. Mikrochim Acta 2018; 185:554. [DOI: 10.1007/s00604-018-3085-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Accepted: 11/05/2018] [Indexed: 12/20/2022]
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7
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Simon G, Gyulavári T, Hernádi K, Molnár M, Pap Z, Veréb G, Schrantz K, Náfrádi M, Alapi T. Photocatalytic ozonation of monuron over suspended and immobilized TiO2–study of transformation, mineralization and economic feasibility. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.01.025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Boucheloukh H, Remache W, Parrino F, Sehili T, Mechakra H. The effect of natural iron oxide and oxalic acid on the photocatalytic degradation of isoproturon: a kinetics and analytical study. Photochem Photobiol Sci 2017; 16:759-765. [PMID: 28345701 DOI: 10.1039/c6pp00441e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photocatalytic degradation of isoproturon, a persistent toxic herbicide, was investigated in the presence of natural iron oxide and oxalic acid and under UV irradiation. The influence of the relevant parameters such as the pH and the iron oxide and oxalic acid concentrations has been studied. The presence of natural iron oxide and oxalic acid in the system effectively allow the degradation of isoproturon, whereas the presence of t-butyl alcohol adversely affects the phototransformation of the target pollutant, thus indicating that an OH radical initiated the degradation mechanism. The degradation mechanism of isoproturon was investigated by means of GC-MS analysis. Oxidation of both the terminal N-(CH3)2 and isopropyl groups is the initial process leading to N-monodemethylated (NHCH3), N-formyl (N(CH3)CHO), and CHCH3OH as the main intermediates. The substitution of the isopropyl group by an OH group is also observed as a side process.
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Affiliation(s)
- H Boucheloukh
- Laboratory of Sciences and Technology of the Environment, University Constantine1, Constantine 25000, Algeria.
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9
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Hydroxyl radical induced transformation of phenylurea herbicides: A theoretical study. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2016.11.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Kovács K, He S, Míle V, Földes T, Pápai I, Takács E, Wojnárovits L. Ionizing radiation induced degradation of monuron in dilute aqueous solution. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.10.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Marincas O, Floare-Avram V, Feher I, Lazăr D, Voica C, Grosu I. Inexpensive Adsorbents Derived from Coffee Grounds for the Treatment of Wastewater. ANAL LETT 2016. [DOI: 10.1080/00032719.2015.1125913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Kovács K, Farkas J, Veréb G, Arany E, Simon G, Schrantz K, Dombi A, Hernádi K, Alapi T. Comparison of various advanced oxidation processes for the degradation of phenylurea herbicides. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2016; 51:205-214. [PMID: 26764571 DOI: 10.1080/03601234.2015.1120597] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Various types of advanced oxidation processes (AOPs), such as UV photolysis, ozonation, heterogeneous photocatalysis and their combinations were comparatively examined at the same energy input in a home-made reactor. The oxidative transformations of the phenylurea herbicides fenuron, monuron and diuron were investigated. The initial rates of transformation demonstrated that UV photolysis was highly efficient in the cases of diuron and monuron. Ozonation proved to be much more effective in the transformation of fenuron than in those of the chlorine containing monuron and diuron. In heterogeneous photocatalysis, the rate of decomposition decreased with increase of the number of chlorine atoms in the target molecule. Addition of ozone to UV-irradiated solutions and/or TiO2-containing suspensions markedly increased the initial rates of degradation. Dehalogenation of monuron and diuron showed that each of these procedures is suitable for the simultaneous removal of chlorinated pesticides and their chlorinated intermediates. Heterogeneous photocatalysis was found to be effective in the mineralization.
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Affiliation(s)
- Krisztina Kovács
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- b Institute of Isotopes, Centre for Energy Research, Hungarian Academy of Sciences , Budapest , Hungary
| | - János Farkas
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Gábor Veréb
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Eszter Arany
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Gergő Simon
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Krisztina Schrantz
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- c Department of Inorganic and Analytical Chemistry , University of Szeged , Szeged , Hungary
| | - András Dombi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
| | - Klára Hernádi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- d Department of Applied and Environmental Chemistry , University of Szeged , Szeged , Hungary
| | - Tünde Alapi
- a Research Group of Environmental Chemistry, University of Szeged , Szeged , Hungary
- c Department of Inorganic and Analytical Chemistry , University of Szeged , Szeged , Hungary
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Wu Q, Zheng X, Pei K. Phototransformation mechanism of monuron induced by the triplet benzophenone in aqueous solution. J PHYS ORG CHEM 2015. [DOI: 10.1002/poc.3431] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qiuxia Wu
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles; Ministry of Education; Zhejiang Sci-Tech University; Hangzhou 310018 China
- Department of chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 China
| | - Xuming Zheng
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles; Ministry of Education; Zhejiang Sci-Tech University; Hangzhou 310018 China
- Department of chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 China
| | - Kemei Pei
- Engineering Research Center for Eco-Dyeing and Finishing of Textiles; Ministry of Education; Zhejiang Sci-Tech University; Hangzhou 310018 China
- Department of chemistry; Zhejiang Sci-Tech University; Hangzhou 310018 China
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Yahya MS, Oturan N, El Kacemi K, El Karbane M, Aravindakumar CT, Oturan MA. Oxidative degradation study on antimicrobial agent ciprofloxacin by electro-Fenton process: kinetics and oxidation products. CHEMOSPHERE 2014; 117:447-54. [PMID: 25201488 DOI: 10.1016/j.chemosphere.2014.08.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 08/08/2014] [Accepted: 08/11/2014] [Indexed: 05/10/2023]
Abstract
Oxidative degradation of the antimicrobial agent ciprofloxacin hydrochloride (CIP) has been investigated using electro-Fenton (EF) treatment with a constant current in the range 60-500 mA. The process generates highly oxidant species OH in situ via electrochemically monitored Fenton reaction. The EF experiments were performed using cells with a carbon felt cathode and Pt anode. Effect of applied current and catalyst concentration on the kinetics of oxidative degradation and mineralization efficiency have been investigated. Degradation of CIP followed pseudo-first order reaction kinetics. The rate constant of the oxidation of CIP by OH has been determined to be (1.01 ± 0.14) × 10(10) M(-1) s(-1) by using competitive kinetics method. An optimum current of 400 mA and a catalyst concentration of Fe(2+) at 0.1mM are found to be optimal for an effective degradation of CIP under our operating conditions. A remarkably high degree of mineralization (>94%) was obtained at 6h of treatment under these conditions. A number of stable intermediate products have been identified using HPLC and LC-MS/MS analyses. Based on the identified reaction intermediates, a plausible reaction pathway was proposed for the mineralization process. The high degree of mineralization obtained in this work highlights the potential application of EF process in the efficient removal of fluoroquinolone based drugs in aqueous medium.
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Affiliation(s)
- Muna Sh Yahya
- Laboratoire d'Électrochimie et Chimie Analytique (LECA), Université Mohammed V - Agdal, Rabat, Morocco
| | - Nihal Oturan
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4506, 5 Bd Descartes, 77454 Marne-la-Vallée, France
| | - Kacem El Kacemi
- Laboratoire d'Électrochimie et Chimie Analytique (LECA), Université Mohammed V - Agdal, Rabat, Morocco
| | - Miloud El Karbane
- Physicochemical Service, Drugs Quality Control Laboratory, Division of Drugs and Pharmacy, Ministry of Health, Rabat, Morocco
| | - C T Aravindakumar
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam 686560, Kerala, India
| | - Mehmet A Oturan
- Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4506, 5 Bd Descartes, 77454 Marne-la-Vallée, France.
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Fenoll J, Martínez-Menchón M, Navarro G, Vela N, Navarro S. Photocatalytic degradation of substituted phenylurea herbicides in aqueous semiconductor suspensions exposed to solar energy. CHEMOSPHERE 2013; 91:571-578. [PMID: 23298667 DOI: 10.1016/j.chemosphere.2012.11.067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 11/27/2012] [Accepted: 11/28/2012] [Indexed: 06/01/2023]
Abstract
The photocatalyzed degradation of the biocides chlorotoluron, diuron, fluometuron, isoproturon and linuron (substituted phenylurea herbicides) was investigated in aqueous suspensions of ZnO, TiO2, WO3, SnO2 and ZnS at pilot plant scale under natural sunlight. Comparison of the five catalysts showed that ZnO is the most effective for catalyzing the removal of all the compounds studied. The primary degradation of the herbicides followed a pseudo-first order kinetics. In our conditions, the time required for 90% degradation ranged from 23 to 47min for isoproturon and linuron, respectively, when using the tandem ZnO/Na2S2O8. Eight transformation products were identified by HPLC-MS(2) during the experiments, although at the end of the photoperiod (240min), their concentrations were below detection limits. Based on derivative identification, the proposed metabolic pathways would involve N-demethylation and N-demethoxylation of the N-methoxy-N-methyl substituted ureas and N-demethylation of the N,N-dimethylurea-substituted compounds.
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Affiliation(s)
- José Fenoll
- Departamento de Calidad y Garantía Alimentaria, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), C/Mayor s/n, La Alberca, Murcia, Spain
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16
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Fenoll J, Sabater P, Navarro G, Pérez-Lucas G, Navarro S. Photocatalytic transformation of sixteen substituted phenylurea herbicides in aqueous semiconductor suspensions: intermediates and degradation pathways. JOURNAL OF HAZARDOUS MATERIALS 2013; 244-245:370-379. [PMID: 23270960 DOI: 10.1016/j.jhazmat.2012.11.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 11/21/2012] [Accepted: 11/23/2012] [Indexed: 06/01/2023]
Abstract
The photocatalytic degradation of sixteen substituted phenylurea herbicides (PUHs) in pure water has been studied using zinc oxide (ZnO) and titanium dioxide (TiO(2)) as photocatalyst under artificial light irradiation. Photocatalytic experiments showed that the addition of these chalcogenide oxides in tandem with the oxidant (Na(2)S(2)O(8)) strongly enhances the degradation rate of these compounds in comparison with those carried out with ZnO and TiO(2) alone and photolytic tests. Comparison of catalysts showed that ZnO is the most efficient for the removal of such herbicides in optimal conditions and at constant volumetric rate of photon absorption in the photoreactor. Thus, the complete disappearance of all the studied compounds was achieved after 20 min of illumination in the ZnO/Na(2)S(2)O(8) system. The main photocatalytic intermediates detected during the degradation of PUHs were identified. The probable photodegradation pathways were proposed and discussed. The main steps involved: N-demethylation of the N,N-dimethylurea-substituted compounds followed of N-demethylation and N-demethoxylation of the N-methoxy-N-methyl-substituted ureas and hydroxylation of aromatic rings and their aliphatic side-chains of both, parent compounds and intermediates.
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Affiliation(s)
- José Fenoll
- Departamento de Calidad y Garantía Alimentaria, Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), C/Mayor s/n, La Alberca, 30150 Murcia, Spain.
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Autin O, Hart J, Jarvis P, MacAdam J, Parsons SA, Jefferson B. Comparison of UV/H2O2 and UV/TiO2 for the degradation of metaldehyde: Kinetics and the impact of background organics. WATER RESEARCH 2012; 46:5655-5662. [PMID: 22901408 DOI: 10.1016/j.watres.2012.07.057] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 07/20/2012] [Accepted: 07/28/2012] [Indexed: 06/01/2023]
Abstract
The kinetics of photodegradation of the pesticide metaldehyde by UV/H(2)O(2) and UV/TiO(2) in laboratory grade water and a natural surface water were studied. Experiments were carried out in a bench scale collimated beam device using UVC radiation. Metaldehyde was efficiently degraded by both processes in laboratory grade water at identical rates of degradation (0.0070 and 0.0067 cm(2) mJ(-1) for UV/TiO(2) and UV/H(2)O(2) respectively) when optimised doses were used. The ratio between oxidant and metaldehyde was significantly higher for H(2)O(2) due to its low photon absorption efficiency at 254 nm. However, the presence of background organic compounds in natural water severely affected the rate of degradation, and whilst the pseudo first-order rate constant of degradation by UV/H(2)O(2) was slowed down (0.0020 cm(2) mJ(-1)), the degradation was completely inhibited for the UV/TiO(2) process (k' = 0.00007 cm(2) mJ(-1)) due to the blockage of active sites on TiO(2) surface by the background organic material.
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Affiliation(s)
- Olivier Autin
- Cranfield Water Science Institute, Department of Environmental Science and Technology, Cranfield University, Bedfordshire MK43 0AL, UK
| | - Julie Hart
- Severn Trent Water LTD., Severn Trent Centre, PO Box 5309, Coventry CV3 9FH, West Midlands, UK
| | - Peter Jarvis
- Cranfield Water Science Institute, Department of Environmental Science and Technology, Cranfield University, Bedfordshire MK43 0AL, UK
| | - Jitka MacAdam
- Cranfield Water Science Institute, Department of Environmental Science and Technology, Cranfield University, Bedfordshire MK43 0AL, UK
| | - Simon A Parsons
- Cranfield Water Science Institute, Department of Environmental Science and Technology, Cranfield University, Bedfordshire MK43 0AL, UK
| | - Bruce Jefferson
- Cranfield Water Science Institute, Department of Environmental Science and Technology, Cranfield University, Bedfordshire MK43 0AL, UK.
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Chu W, Rao YF. Photocatalytic oxidation of monuron in the suspension of WO3 under the irradiation of UV-visible light. CHEMOSPHERE 2012; 86:1079-1086. [PMID: 22205047 DOI: 10.1016/j.chemosphere.2011.11.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 10/25/2011] [Accepted: 11/22/2011] [Indexed: 05/31/2023]
Abstract
A comprehensive study of the degradation of monuron, one of the phenylurea herbicides, was conducted by UV-Vis/WO(3) process. It was found that hydroxyl radicals played a major role in the decay of monuron while other radicals (e.g. superoxide) and hole might also contribute to the decomposition of monuron. The oxidation path likely plays a major role in the generation of hydroxyl radicals. The effects of initial pH level, initial concentration of monuron, and inorganic oxidants on the performance of UV-Vis/WO(3) process were also investigated and optimized. Comparison between monuron decay pathways by UV-Vis/WO(3) and UV/TiO(2) was conducted. The decay mechanisms, including N-terminus demethylation, dechlorination and direct hydroxylation on benzene ring, were observed to be involved in the oxidation of monuron in these two processes. Sixteen intermediates were identified during the photodegradation of monuron and degradation pathways were proposed accordingly.
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Affiliation(s)
- W Chu
- Department of Civil and Structural Engineering, Research Centre for Urban Environmental Technology and Management, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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19
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Boucheloukh H, Sehili T, Kouachi N, Djebbar K. Kinetic and analytical study of the photo-induced degradation of monuron by nitrates and nitrites under irradiation or in the dark. Photochem Photobiol Sci 2012; 11:1339-45. [DOI: 10.1039/c2pp25044f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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González-Bahamón LF, Hoyos DF, Benítez N, Pulgarín C. New Fe-immobilized natural bentonite plate used as photo-Fenton catalyst for organic pollutant degradation. CHEMOSPHERE 2011; 82:1185-1189. [PMID: 21167551 DOI: 10.1016/j.chemosphere.2010.11.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 11/24/2010] [Accepted: 11/25/2010] [Indexed: 05/30/2023]
Abstract
Novel photo-Fenton catalysts were prepared by immobilizing iron species on commercial bentonite plates via two methods: (1) ion exchange reaction (Fe(3+) vs. Na(+)) by aqueous suspension powder-clay/FeCl(3) followed by plate preparation, and (2) forced hydrolysis of Fe(NO(3))(3) onto a prefabricated clay plate. The last method led to a more photo-active Fe-oxide/bentonite plate. This material allowed, at a non-adjusted initial pH of 5.5 and in the presence of H(2)O(2), the total degradation of resorcinol and 55% mineralization in 80 and 100 min of irradiation, respectively. The reached degradation percentages were correlated to the presence of dissolved iron, demonstrating that in these processes, the homogeneous photo-Fenton reactions were mainly responsible for the resorcinol elimination. Likewise, in slurry system, where clay has normally an increased surface area, there was no increase in activity because of a reduced leached iron probably due to the diminished light penetration in the suspension. Despite the lower surface area, in comparison to that of the slurry, the clay plates have the advantage, as heterogeneous photo-catalysts, that separation of the reaction media after treatment is not needed, and thus, a potential use for batch and continuous reaction systems is proposed.
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Affiliation(s)
- Luis Ferney González-Bahamón
- Facultad de Ciencias Naturales y Exactas, Departamento de Química, Universidad del Valle, A.A. 25360 Cali, Colombia
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Ruggieri F, Antonio D'Archivio A, Fanelli M, Santucci S. Photocatalytic degradation of linuron in aqueous suspensions of TiO2. RSC Adv 2011. [DOI: 10.1039/c1ra00133g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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23
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Nélieu S, Shankar M, Kerhoas L, Einhorn J. Phototransformation of monuron induced by nitrate and nitrite ions in water: Contribution of photonitration. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.05.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chu W, Choy WK, Kwan CY. Selection of supported cobalt substrates in the presence of oxone for the oxidation of monuron. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2007; 55:5708-13. [PMID: 17567139 DOI: 10.1021/jf063754r] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The immobilization of cobalt ion on different media to catalyze oxone has been investigated. A probe herbicide, Monuron, was effectively degraded by using Co2+/oxone systems. For Co2+ supported on zeolite, 100% of Monuron could be removed within a 10 min reaction time. However, the recycling of the spent Co-zeolite catalyst using various posttreatments did not give a promising result. This is likely because the zeolite particles in solution have blocked and significantly attenuated the incident UV light from reducing Co3+ to Co2+. On the contrary, the use of cationic resin has minimized these problems. In the process of Co-resin/oxone/UV, faster Monuron decay could be achieved than that in the dark reaction. In the presence of UV, a significant drop of total organic carbon (TOC) was also observed in this approach suggesting an effective and clean process for Monuron mineralization.
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Affiliation(s)
- W Chu
- Department of Civil and Structural Engineering, Research Centre for Environmental Technology and Management, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong.
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Ioan I, Wilson S, Lundanes E, Neculai A. Comparison of Fenton and sono-Fenton bisphenol A degradation. JOURNAL OF HAZARDOUS MATERIALS 2007; 142:559-63. [PMID: 17011123 DOI: 10.1016/j.jhazmat.2006.08.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Revised: 06/14/2006] [Accepted: 08/10/2006] [Indexed: 05/12/2023]
Abstract
Degradation of bisphenol A (BPA) was carried out with the Fenton reagent with and without additional sonochemical treatment. The Fenton and the sono-Fenton decomposition of BPA showed that ultrasound irradiation of wastewater improved the wet oxidation process of 25 mg l(-1) BPA solutions. The sonochemical degradation of BPA was monitored using UV absorption and large volume injection packed capillary LC measurements.
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Affiliation(s)
- Iordache Ioan
- OLTCHIM Research Center, 1 Uzinei Street, 240050 Rm. Vâlcea, Romania.
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Wilson SR, Malerød H, Petersen D, Rise F, Lundanes E, Greibrokk T. An alternative multiple-trapping LC-SPE-NMR system. J Sep Sci 2007; 30:322-8. [PMID: 17396589 DOI: 10.1002/jssc.200600238] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In this paper, we describe approaches that make RP LC-SPE-NMR simpler, and in our opinion, result in more reliable methods for trapping and subsequent transfer of separated trace-level compounds to the NMR. An SPE unit based on a commercially available, low dead-volume 10 port high-pressure column selector gives the possibility of trapping compounds on nine individual SPEs that have standard fittings. This allows the operator to employ specific stationary phases that are not available as SPEs in commercially available LC-SPE-NMR systems. Multiple trappings of small compounds like monuron, 1-(4-chlorophenyl)-3-methylurea, and 4-chlorophenylurea were easily performed employing a porous-carbon SPE material. The system was optimized to elute the SPE-trapped compounds to the NMR probes in as small a volume as possible using back-flushing. The proper match of NMR probe volume and SPE column inner diameter and elution volume was discussed, as well as the necessity of drying loaded SPEs prior to NMR transfer when using porous-carbon SPE material.
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Affiliation(s)
- Steven Ray Wilson
- Department of Chemistry, University of Oslo, Blindern, Oslo, Norway.
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