Document Detail


Solar photoelectro-Fenton degradation of the herbicide 4-chloro-2-methylphenoxyacetic acid optimized by response surface methodology.
MedLine Citation:
PMID:  21872394     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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.
Authors:
Sergi Garcia-Segura; Lucio Cesar Almeida; Nerilso Bocchi; Enric Brillas
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-5
Journal Detail:
Title:  Journal of hazardous materials     Volume:  -     ISSN:  1873-3336     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Affiliation:
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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