电化学氧化法是难降解有机物降解处理的1种有效方法,高效电极材料是该技术得以实现的关键,近年来,金属氧化物电极的研究倍受重视.作者制备了钛基RuOx-PdO电极,并以其为阳极进行了苯胺的电催化氧化降解研究.发现该电极对苯胺有较好的电催化氧化性能:在以NaCl(1g/L)为支持电解质、初始pH=5.0、电流密度=20mA?cm-2的条件下,对浓度为640mg/L的苯胺溶液电催化氧化降解1h,苯胺去除率可达99.4%,溶液COD(化学需氧量)去除率达84.0%,电极具有较长使用寿命.苯胺的去除主要是活性氯的间接氧化作用实现的,苯胺降解中间产物的去除则是活性氯间接氧化和电极直接氧化协同作用的结果.用GC-MS检测到苯胺电催化氧化过程中有对氯苯胺、2,4-二氯苯胺、2,4,5-三氯苯胺和苯醌等中间产物生成,据此探讨了苯胺的降解途径.
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