组合阳极联合气体扩散阴极电催化降解苯胺

采用气体扩散电极为阴极，钛基氧化物（Ti／SnO2-Sb2O5-IrO2）和金属铁构成组合阳极，构建了新型电化学氧化体系用于降解有机污染物。利用该氧化体系，在不同实验条件下考察了苯胺降解的效果与降解过程的相关规律。结果表明，阴极电位、铁阳极通电时间以及苯胺初始浓度均显著影响苯胺的降解效果。当阴极电位为-0．7V，pH3．0，铁阳极通电时间20min时，电化学处理200mg／L苯胺480min，TOC的去除效率达到80．4％，矿化电流效率（MCE）为8．6％，显示了该氧化体系具有良好的有机物降解能力。此外，苯胺降解过程中氨氮和硝态氮浓度的变化表明，苯胺分子中的氮主要转化为NH4和NO3^-。

Degradation of aniline by electrocatalytic process with combinated anode and gas diffusion cathode

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^-.