Anodic oxidation of Methylene Blue dye from aqueous solution using SnO2 electrode

Document Type: Research Article

Authors

1 Laboratory of Materials & Environmental Science, Chemistry Department, Ibn Zohr University, Agadir, MOROCCO

2 Faculty of Materials and Chemical Engineering, GIK Institute of Engineering Sciences and Technology Topi, 23460, KPK, PAKISTAN

3 Team Innovation and Development in Engineering Food, Laboratory for Sustainable Innovation and Applied Research (LIDRA), International University of Agadir, Universiapolis, MOROCCO

4 Chernivtsi National University, 58012, Kotsyubyns’ky Str, 2, Chernivtsi, UKRAINE

Abstract

This study was performed to investigate the electrochemical oxidation of a solution containing methylene blue dye by using tin oxide (SnO2) electrode. The effect of several operating factors such as electrolyte types, current density, initial dye concentration and pH were investigated in terms of the decolorization and COD removal. The results show that the maximum color was removed by using chloride supporting electrolyte (i.e. KCl and NaCl) indicating that the indirect oxidation was promoted by the strong oxidant species (i.e. Cl2 and ClO–) generated at the anode surface. The best experimental conditions were attained for i = 60mA cm-2, 1% KCl and pH = 3, which 100% of color was removed after 30 minutes and the COD removal reached to 80.9% after 120 min. These results reveal that the anodic oxidation technique using SnO2 electrode could be used to remove the methylene blue dye from textile wastewater.

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