Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/25130
Type: Artigo de periódico
Title: Comparative Study of Commercial Oxide Electrodes Performance in Electrochemical Degradation of Organics in Aqueous Solutions
Author: Pelegrino, Rosângela L.
Di Iglia, Rosana A.
Sanches, Caio G.
Avaca, Luis A.
Bertazzoli, Rodnei
Abstract: In this paper the potentiality of two types of DSAâ commercial electrodes, for electrochemical treatment of effluents, is investigated. Oxide anodes, with nominal composition of 70TiO2/30RuO2 and 45IrO2/55Ta2O5, were used in a flow-cell reactor for the electrooxidation of phenol. Comparative results were presented as phenol concentration decay as a function of electrolysis time, as well as COD and TOC concentration reduction. The cell reactor was operated at current densities, ranging from 15 to 150 mA cm-2 and solution linear velocity was 0.24 m s-1. Results reported in this paper showed that phenol and quinones were degraded to a very low concentration, besides only a small portion of the organic carbon is reduced. Starting from 100 mg L-1, after five hours of electrolysis at 100 mA cm-2, concentrations reached 0.4 mg L-1 of phenol, 1 mg L-1 of hydroquinone, 7 mg L-1 of benzoquinone and TOC was reduced by 35%.
Neste trabalho foi realizado um estudo visando a potencial aplicação de dois eletrodos comerciais tipo DSAâ no tratamento eletroquímico de efluentes aquosos. Anodos com composição superficial 70TiO2/30RuO2 e 45IrO2/55Ta2O5 foram usados num reator de fluxo com densidades de corrente de 15 a 150 mA.cm-2 e velocidade da solução de 0,24 m.s-1. Os resultados mostram que fenol e as quinonas são degradados até concentrações muito baixas, embora apenas uma pequena fração seja mineralizada. A partir de uma solução com 100 mg.L-1 de fenol, a 100 mA.cm-2, após cinco horas de eletrólise foram encontrados 0,4 mg.L-1 de fenol, 1 mg.L-1 de hidroquinona e 7 mg.L-1 de benzoquinona. TOC foi reduzido em 35%.
Subject: electrochemical treatment of effluents
oxide coated electrodes
phenol oxidation
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0103-50532002000100009
Address: http://dx.doi.org/10.1590/S0103-50532002000100009
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000100009
Date Issue: 1-Feb-2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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