Comparison of oxidation efficiency of disperse dyes by chemical and photoelectrocatalytic chlorination and removal of mutagenic activity
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Data
2009-02-28
Autores
Osugi, Marly E. [UNESP]
Rajeshwar, Krishnan
Ferraz, Elisa R. A.
de Oliveira, Danielle P.
Araújo, Angela Regina [UNESP]
Zanoni, Maria Valnice Boldrin [UNESP]
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Editor
Pergamon-Elsevier B.V. Ltd
Resumo
Degradation of Disperse Orange 1, Disperse Red 1 and Disperse Red 13 dyes has been performed using electrochemical oxidation on Pt electrode, chemical chlorination and photoelectrochemical oxidation on Ti/TiO(2) thin film electrodes in NaCl or Na(2)SO(4) medium. 100% discoloration was obtained for all tested methods after 1 h of treatment. Faster color removal was obtained by photoelectrocatalytic oxidation in 0.1 mol L(-1) NaCl pH 4.0 under UV light and an applied potential of +1.0V (vs SCE reference electrode), which indicates also values around 60% of TOC removal. The conventional chlorination method and electrochemical oxidation on Pt electrode resulted in negligible reduction of TOC removal. All dyes showed positive mutagenic activity in the Salmonella/microsome assay with the strain TA98 in the absence and presence of S9 (exogenous metabolic activation). Nevertheless, there is complete reduction of the mutagenic activity after 1 h of photoelectrocatalytic oxidation, suggesting that this process would be good option to remove disperse azo dyes from aqueous media. (C) 2008 Elsevier Ltd. All rights reserved.
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Active chlorine, Disperse azo dye, Photoelectrocatalytic oxidation, Mutagenic activity, Ti/TiO(2) electrodes
Como citar
Electrochimica Acta. Oxford: Pergamon-Elsevier B.V. Ltd, v. 54, n. 7, p. 2086-2093, 2009.