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Journal of Electrochemical Science and Engineering, Vol. 4 No. 4, 2014.

Original scientific paper

https://doi.org/10.5599/jese.2014.0069

Electrochemical mediated oxidation of phenol using Ti/IrO2 and Ti/Pt-SnO2-Sb2O5 electrodes

Jéssica Pires de Paiva Barreto ; Federal University of Rio Grande do Norte, CCET - Institute of Chemistry, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil
Elisama Vieira dos Santos ; Federal University of Rio Grande do Norte, CCET - Institute of Chemistry, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil
Mariana Medeiros Oliveira ; Federal University of Rio Grande do Norte, CCET - Institute of Chemistry, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil
Djalma Ribeiro da Silva ; Federal University of Rio Grande do Norte, CCET - Institute of Chemistry, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil
João Fernandes de Souza ; Federal University of Rio Grande do Norte, CCET – Department of Chemical Engineering, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil
Carlos A. Martínez-Huitle ; Federal University of Rio Grande do Norte, CCET – Department of Chemical Engineering, Campus Universitario, Lagoa Nova - CEP 59.072-970, RN, Brazil

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Abstract

The indirect electrochemical oxidation of phenol was studied at Ti/IrO2 and Ti/Pt-SnO2-Sb2O5 electrodes by bulk electrolysis experiments under galvanostatic control. The obtained results clearly shown that the electrode material was an impor­tant para­me­ter for the optimization of such processes determining their mecha­nism and oxidation products. Different current efficiencies were obtained at Ti/IrO2 and Ti/Pt-SnO2-Sb2O5, depending on the applied current density in the range from 10, 20 and 30 mA cm−2. The effect of the amount of dissolved NaCl was studied also. It was observed that the electrochemical processes (direct/indirect) favor specific oxidation pathways depending on electrocatalytic material. Phenol degradation generates several intermediates eventually leading to complete mineralization, as indicated by the results obtained with the High-performance liquid chromatography (HPLC) technique.

Keywords

Phenol; anode material; chlorine active species, indirect electrochemical oxidation

Hrčak ID:

130225

URI

https://hrcak.srce.hr/130225

Publication date:

6.12.2014.

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