Electrochemical Treatment of Synthetic Wastewaters Containing Alphazurine A Dye: Role of Electrode Material in the Colour and COD Removal

Authors

  • José L. Nava Universidad Autónoma Metropolitana-Iztapalapa
  • Marco A. Quiroz Universidad de las Américas-Puebla
  • Carlos A. Martínez-Huitle University of Milan

DOI:

https://doi.org/10.29356/jmcs.v52i4.1076

Keywords:

anodic oxidation, dyes, boron doped diamond electrode, iridium dioxide electrode, lead dioxide electrode

Abstract

The electrochemical oxidation of Alphazurine A (azA) has been studied in Na2SO4 media at Ti/IrO2, Pb/PbO2 and boron-doped diamond (Si/BDD) electrodes by bulk electrolysis experiments under galvanostatic control at j = 30 and 60 mA cm-2. The obtained results have clearly shown that the electrode material plays an important role for the electrochemical incineration of azA, where Pb/PbO2 and Si/BDD lead complete mineralization of dye, while Ti/IrO2 disfavoured such process. The complete mineralization of ±zA on Pb/PbO2 and Si/BDD is due to the production of hydroxyl radicals on these materials surfaces. Current efficiencies obtained at Ti/IrO2, Pb/PbO2 and Si/ BDD gave values of 3, 24 and 42%, for each electrode material, at 30 mA cm-2, respectively. These values were higher than those obtained at 60 mA cm-2. Energy consumption values from the electrolyses performed at 30 mA cm-2 were 254, 124 and 51 kWh m-3, for Ti/IrO2, Pb/PbO2 and Si/BDD, respectively. UV spectrometric measurements showed faster azA elimination at the Si/BDD electrode than those obtained on Ti/IrO2 and Pb/PbO2.

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Author Biographies

José L. Nava, Universidad Autónoma Metropolitana-Iztapalapa

Departamento de Química

Marco A. Quiroz, Universidad de las Américas-Puebla

Departamento de Química y Biología

Carlos A. Martínez-Huitle, University of Milan

DiSTAM, Laboratory of Electrochemistry

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Published

2019-07-31

Issue

Vol. 52 No. 4 (2008): Regular Issue

Section

Regular Articles

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