Degradation of aniline by electrocatalytic process with combinated anode and gas diffusion cathode
组合阳极联合气体扩散阴极电催化降解苯胺

A novel electrochemical oxidation system using gas diffusion electrode as the cathode, Ti/SnO2-Sb2O5-IrO2 and Fe as the combinated anode was constructed for the degradation of organic pollutants. The efficiency of aniline degradation and the related degradation behaviors were investigated under different experimental conditions by this oxidation system. The results show that the cathodic potential, the time of current passing through Fe anode and the initial concentration of aniline have obvious effects on aniline degradation. Under the conditions of -0.7 V cathodic potential, pH 3.0 and 20 min for current passing through Fe anode, TOC removal rate was 80.4% by the treatment of 480 min for 200 mg/L aniline solution and a mineralization current efficiency of 8.6% could be obtained, which indicated that the oxidation system had a fine ability for organics degradation. In addition, the variation of ammonium and nitrate nitrogen concentration revealed that the original nitrogen was mainly transformed into NH4+ and NO3-.