Artículos de revistas
Comparative Study of Commercial Oxide Electrodes Performance in Electrochemical Degradation of Organics in Aqueous Solutions
Registro en:
Journal of the Brazilian Chemical Society. Sociedade Brasileira de Química, v. 13, n. 1, p. 60-65, 2002.
0103-5053
S0103-50532002000100009
10.1590/S0103-50532002000100009
Autor
Pelegrino, Rosângela L.
Di Iglia, Rosana A.
Sanches, Caio G.
Avaca, Luis A.
Bertazzoli, Rodnei
Institución
Resumen
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%. 60 65