Abstract: The electro-Fenton degradation of azo dye methyl orange (MO) in water was conducted with four different cathodes (plumbaginous cathode，steel wire cathode，titanizing steel wire cathode and silver-gilt steel wire cathode)，and the effect of cathode on the removal rate of MO was investigated. The decoloration value of MO is the highest with the silver-gilt steel wire cathode under same conditions，and then the titanizing steel wire cathode，the steel wire cathode and the plumbaginous cathode in turn. Moreover，the degradation of MO accorded with a first order kinetic equation with all the four different cathodes.

摘要： 选择偶氮染料甲基橙（MO）为目标污染物，在电-Fenton降解体系中考察了4种自制阴极电极（石墨电极、钢丝电极、镀钛钢丝电极和镀银钢丝电极）对MO的氧化降解的影响。研究表明，在相同的实验条件下，镀银钢丝电极作阴极时，MO的去除率最大，镀钛钢丝电极、钢丝电极、石墨电极依次减小，且4种阴极材料下MO的氧化降解反应均符合一级反应动力学。