| Solar photoelectro-Fenton degradation of the herbicide 4-chloro-2-methylphenoxyacetic acid optimized by response surface methodology. | |
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MedLine Citation:
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PMID: 21872394 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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A central composite rotatable design and response surface methodology (RSM) were used to optimize the experimental variables of the solar photoelectro-Fenton (SPEF) treatment of the herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA). The experiments were made with a flow plant containing a Pt/air-diffusion reactor coupled to a solar compound parabolic collector (CPC) under recirculation of 10L of 186mgL(-1) MCPA solutions in 0.05M Na(2)SO(4) at a liquid flow rate of 180Lh(-1) with an average UV irradiation intensity of about 32Wm(-2). The optimum variables found for the SPEF process were 5.0A, 1.0mM Fe(2+) and pH 3.0 after 120min of electrolysis. Under these conditions, 75% of mineralization with 71% of current efficiency and 87.7kWhkg(-1) TOC of energy consumption were obtained. MCPA decayed under the attack of generated hydroxyl radicals following a pseudo-first-order kinetics. Hydroxyl radicals also destroyed 4-chloro-2-methylphenol, methylhydroquinone and methyl-p-benzoquinone detected as aromatic by-products. Glycolic, maleic, fumaric, malic, succinic, tartronic, oxalic and formic acids were identified as generated carboxylic acids, which form Fe(III) complexes that are quickly photodecarboxylated by the UV irradiation of sunlight at the CPC photoreactor. A reaction sequence for the SPEF degradation of MCPA was proposed. |
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Authors:
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Sergi Garcia-Segura; Lucio Cesar Almeida; Nerilso Bocchi; Enric Brillas |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-8-5 |
Journal Detail:
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Title: Journal of hazardous materials Volume: - ISSN: 1873-3336 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
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Created Date: 2011-8-29 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9422688 Medline TA: J Hazard Mater Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
Affiliation:
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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. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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