钯负载泡沫镍电极电化学还原水中三氯乙酸

采用非电沉积法制备了钯负载泡沫镍电极,运用SEM技术对其进行了表征,并以其阴极、铂丝为阳极进行了电化学还原三氯乙酸的研究,考察了工艺条件对三氯乙酸降解效果的影响,并对反应动力学和反应机理和进行了探讨。结果表明:钯负载泡沫镍电极具有较高的比表面积和良好的储氢性能;以20 mmol/L硫酸钠为电解质,在电解温度为20℃、钯负载量为4.5 mg/cm~2的条件下恒流(10 mA)电解240 min,三氯乙酸降解率达99.76%,氯原子脱除率达73.86%;三氯乙酸的电化学还原反应过程以及三氯乙酸上未脱除氯原子浓度的变化均符合拟一级反应动力学方程;三氯乙酸在电化学还原过程中逐个脱除氯原子。

Electrochemical reduction of acetocaustin in aqueous solution by Pd-loaded nickel foam electrode

The Pd-loaded Ni foam electrode was prepared by non electro deposition method and characterized by SEM. The electrochemical reduction of acetocaustin was researched using Pd-loaded Ni foam electrode as cathode and platinum wire as anode. The effects of process conditions on acetocaustin degradation were investigated,the kinetic and mechanism of the reaction were discussed. The results showed that：The Pd-loaded Ni foam electrode had high specific area and good hydrogen storage performance;Under the conditions of using 20 mmol/L sodium sulfate as electrolyte,electrolysis temperature 20 ℃,Pd-loading amount 4.5 mg/cm²,constant current 10 mA and electrolysis time 240 min,the acetocaustin degradation rate and the chlorine removal rate were 99.76% and 73.86% respectively;The electrochemical reduction process of acetocaustin and the concentration change of the residual chlorine atoms on acetocaustin both met the pseudo first order kinetic equation;The dechlorination of acetocaustin took place by removing chlorine atoms one by one.