Degradation of the crystal violet by electro-oxidation on Ti/TiO2 and Ti/IrO2-RuO2 electrodes: study of the effects of operating parameters on the process efficiency
The degradation of crystal violet in aqueous solution has been studied by an electro-oxidation process using Ti/TiO2 and Ti/IrO2-RuO2 anode electrodes. The study reveals that the deposition of metal oxide on a suitable metal support, such as pure titanium, improves the electrochemical activity of the electrodes. Different operating parameters were investigated such as current density (4.4 to 6.6 mA∙cm-2), initial concentration of dye (2.5 x 10-5 to 10-4 M), supporting electrolyte concentration (0.5 to 1.5 g∙L-1) and electrode surface (4.55, 5.85 and 7.15 cm2). The best performances of the electrolytic system were recorded using Ti/IrO2-RuO2 and 92% of COD could be removed in 2 h. By comparison, a maximum of 83% of COD could be removed using Ti/TiO2 for a similar imposed treatment time of 2 h.