双极电化学氧化降解水中苯胺

采用钛基氧化物涂层材料（Ti/SnO2-Sb2O5）为阳极,石墨为阴极,在含Fe2＋和不含Fe2＋2种电解质条件下研究了苯胺的电化学氧化降解效率和机制.结果表明,Ti/SnO2-Sb2O5阳极氧化降解有机物的电位约2.0 V±0.1 V,而石墨阴极还原O2生成H2 O2的优化电位为-0.65 V.H2 O2单独作用不能...

Degradation of Aniline by a Dual-Electrode Electrochemical Oxidation Process

The efficiency and the mechanism of aniline degradation by an electrochemical oxidation process using a Ti/SnO₂-Sb₂O₅ electrode as the anode and a graphite electrode as the cathode, were studied in two aqueous electrolytes with/without Fe²⁺. The results showed that the reasonable anodic potential was about 2.0 V±0.1 V for Ti/SnO₂-Sb₂O₅ electrode to oxidize organic compounds, while the optimum cathodic potential was -0.65 V for graphite electrode to reduce O₂ generating H₂O₂. The oxidation degradation of aniline could not take place only by the single action of H₂O₂. Anodic oxidation was accounted for the degradation of aniline in the absence of Fe²⁺, while in the presence of Fe²⁺ both electro-Fenton oxidation and anodic oxidation (dual-electrode electrochemical oxidation) could degradate aniline effectively, and in this case the former was the main mechanism. Under the conditions of -0.65 V cathodic potential, pH 3.0 and 0.5 mmol·L^-1 Fe²⁺, the removal rate of COD was 77.5% after 10 h treatment and a current efficiency of 97.8% for COD removal could be obtained. This work indicates that the dual-electrode electrochemical oxidation is feasible for the degradation of organic compounds with a high current efficiency by using Ti/SnO₂-Sb₂O₅ as anode as well as the reasonable anodic and cathodic potentials.