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Comparative Study of Commercial Oxide Electrodes Performance in Electrochemical Degradation of Organics in Aqueous Solutions

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Author(s): Pelegrino Rosângela L. | Di Iglia Rosana A. | Sanches Caio G. | Avaca Luis A. | Bertazzoli Rodnei

Journal: Journal of the Brazilian Chemical Society
ISSN 0103-5053

Volume: 13;
Issue: 1;
Start page: 60;
Date: 2002;
Original page

Keywords: electrochemical treatment of effluents | oxide coated electrodes | phenol oxidation

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%.

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