活性碳纤维电极法去除水中敌草隆的研究

Removal of diuron from aqueous solution by activated carbon fiber electrode

实验研究了活性炭纤维电极对敌草隆的去除作用。考察了电流强度以及敌草隆浓度对敌草隆去除的影响，对活性炭纤维用于吸附和用作电极去除敌草隆的效应进行了比较分析。结果表明，在0．01～0．05A内，敌草隆的去除随着电流强度的增加而增加，其去除率为58％～91％。敌草隆浓度在5～40mg／L时，其去除率随着浓度的增加而减小，但至1．5h时，去除率均可达95％以上。对于20mg／L的敌草隆，活性炭纤维对其吸附去除率为90％左右，重复使用导致去除效率下降；活性炭纤维电极电化学氧化对其去除率达95％，并且重复使用其效果未见下降。活性炭纤维电极电化学氧化导致敌草隆分子结构破坏、苯环开环发生分解而最终得以去除。活性炭纤维电极可用于水中敌草隆的去除。

Elimination of diuron on activated carbon fiber （ACF） electrode was carried out. Effects of current intensity and concentration of diuron on the removal rate were studied. To evaluate the performance of ACF electrode, adsorption of diuron on ACF was conducted. The results show that in the current range 0.01 - 0.05 A, the removal rate of diuron was 58% -91%. Increasing current intensity led to increase of removal rate. Lower removal efficiency was shown at higher concentration of diuron in the range 5 -40 mg/L. A total removal rate above 95% was achieved for all the concentrations after 1.5 h of electrolysis. Adsorption of diuron reached a removal rate around 90%. Reuse of the ACF resulted in a decrease in the removal efficiency of diuron. Electrochemical oxidation of diuron on ACF electrode reached a removal rate around 95%. Furthermore, no decrease was observed on the removal efficiency for ACF electrode in a three-round electrolysis. The electrochemical oxidation resulted in the ring fracture and degradation of diuron on ACF electrode.