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, Institute of Chemistry, Campus Universitario, Lagoa Nova, RN - Brazil
  • Elisma Vieria dos Santos Federal University of Rio Grande do Norte, Institute of Chemistry, Campus Universitario, Lagoa Nova, RN - Brazil
  • Mariana Medeiros Oliveira Federal University of Rio Grande do Norte, Institute of Chemistry, Campus Universitario, Lagoa Nova, RN - Brazil
  • Djalma Ribeiro da Silva Federal University of Rio Grande do Norte, Institute of Chemistry, Campus Universitario, Lagoa Nova, RN - Brazil
  • João Fernandes de Souza Federal University of Rio Grande do Norte, CCET – Department of Chemical Engineering, Lagoa Nova - CEP 59.072-970, RN, Brazil
  • Carlos Alberto Martinez-Huitle Federal University of Rio Grande do Norte, Institute of Chemistry, Campus Universitario, Lagoa Nova, RN - Brazil
Keywords: Phenol, anode material, chlorine active species, indirect electrochemical oxidation

Abstract

The indirect electrochemical oxidation of phenol has been studied in at Ti/IrO2 and Ti/Pt-SnO2-Sb2O5, electrodes by bulk electrolysis experiments under galvanostatic control. The obtained results have clearly shown that the electrode material is an important parameter for the optimization of such processes, deciding of their mechanism and of the 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. Also the effect of the amount of NaCl dissolved was studied. It has been 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.

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Published
05-12-2014
Section
Electrochemical Engineering