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Type: Artigo de periódico
Title: Destruction of EDTA using Fenton and photo-Fenton-like reactions under UV-A irradiation
Author: Ghiselli, G
Jardim, WF
Litter, MI
Mansilla, HD
Abstract: Degradation experiments using 5 mmol/l ethylenediaminetetraacetic acid (EDTA) solutions at pH 3 were performed in the presence of H(2)O(2) and metals such as Fe(2+), Fe(3+), Cu(2+) and mixtures of Fe(2+)/Cu(2+) and Fe(3+)/Cu(2+) under UV-A irradiation (366 nm)-photo-Fenton and photo-Fenton-like reactions-at different metal/EDTA concentration ratios in order to determine the best conditions for EDTA photochemical removal. Analogous dark reactions were performed for comparison. The reaction course was monitored by both EDTA and TOC determinations. Hydrogen peroxide demand was also evaluated in all cases. In terms of TOC removal, photo-Fenton-like reactions were remarkably more efficient than the analogous Fenton-like reactions. When EDTA was monitored, Fenton-like reactions showed variable performances, being more efficient with EDTA:Fe(2+) and EDTA:Fe(3+) ratios of 1:1. However, in these both cases, reaction rates were lower than the ones obtained under irradiation. Total mineralization ranged from 31% (Cu(2+) system) to 92% (Fe(2+), Fe(3+), Fe(3+) + Cu(2+) and Fe(2+) + Cu(2+) systems) after 4 h of irradiation. Percentage of TOC removal was higher in the presence of iron because some photoactive intermediates were probably formed during EDTA degradation. (C) 2004 Elsevier B.V. All rights reserved.
Subject: advanced oxidation technologies
EDTA destruction
Country: Suíça
Editor: Elsevier Science Sa
Citation: Journal Of Photochemistry And Photobiology A-chemistry. Elsevier Science Sa, v. 167, n. 1, n. 59, n. 67, 2004.
Rights: fechado
Identifier DOI: 10.1016/j.jphotochem.2004.02.005
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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