Electrochemical degradation of Simulated Phenolic Wastewater using Ti/Ni_xO_y-RuO_2-SnO_2-Sb_2O_5 anode

摘要

The electrochemical oxidation of simulated phenolic wastewater was studied using Ti/Ni_xO_y-RuO_2-SnO_2-Sb_2O_5 electrode as anode in a single undivided batch electrochemical reactor. The synthesized anode was characterized for morphology and phase detection using SEM and XRD techniques. The effects of significant process parameters like pH, electrolyte concentration and current density on phenol degradation in terms of chemical oxygen demand (COD) removal efficiency were investigated. The electrolysis was carried out at atmospheric temperature and pressure with an initial phenol concentration of 300 mg/L using NaCl as supporting electrolyte. The effect of applied current density on COD decay was found to be more prominent than that of initial pH and electrolyte concentration. The favourable operating conditions for maximum COD removal (73.6%) were found to be initial pH 2, NaCl concentration of 4 g/L and current density of 70 mA/cm~2. It was observed that COD removal efficiency was enhanced in acidic medium with moderate electrolyte concentration and an increase in current density.