Decolourization and mineralization of Reactive black-5 with transition metal oxide coated electrodes by electrochemical oxidation

摘要

The electrochemical oxidation of RB-5 was investigated at thermally prepared Ti/ CuO_x, Ti/ NiO, Ti/CoO_x, Ti/AgO_x electrodes. The synthetic wastewater of 100 mg/L Reactive black-5 was prepared as a model component for electrochemical treatment. The electro-oxidation was carried out in a discontinuous operation mode under galvanostatic conditions, equipped with a single compartment electrochemical cell. The laboratory fabricated DSA electrodes were allowed to decolorize and mineralize RB-5 at 50 mA/cm~2 constant current density at acidic pH and in presence of chlorine compound. The performance of various electrodes was measured in terms of reduction of colour, COD and TOC with respect to time. This confirms that all electrodes are proved to be efficient for colour and COD reduction but not very promising for TOC reduction.