Comparative Study of Commercial Oxide Electrodes Performance in Electrochemical Degradation of Reactive Orange 7 Dye in Aqueous Solutions

The C/PbO2, Pb+Sn/PbO2+SnO2 and Pb/PbO2 electrodes were prepared by electrodeposition and used as anodes for electrochemical degradation of Reactive Orange 7 (RO7) dye in aqueous solution. These electrodes containing lead dioxide which is characterized by high oxygen evolution overpotential, inexpensive, consume less electrical energy and inert for acidic and basic media. Different operating conditions and factors affecting the treatment process including current density, temperature, initial concentration of RO7, pH, conductive electrolyte and time of electrolysis were studied and optimized. After 15 min, nearly complete degradation of RO7 was achieved (97.66%, 95.33 and 94.60%) using C/PbO2, Pb+Sn/PbO2+SnO2 and Pb/PbO2 electrodes, respectively, at pH 2.54, current density 25 mA cm(-2) and in the presence of NaCl (4 g L-1) at 25 degrees C.