高铁酸钾去除饮用水中二氯乙腈

Removal of dichloroacetonitrile in drinking water by potassium ferrate

选取含氮消毒副产物二氯乙腈(DCAN)作为目标物,采用液液萃取(LLE)-气相色谱仪(GC)方法,研究在不同的反应条件下高铁酸钾(K 2FeO 4)对DCAN的氧化去除效果、降解机制及动力学。结果表明:pH值对DCAN的降解影响较大,当pH=6.5时,高铁酸钾对DCAN的去除效果最佳,高铁酸钾投加量增加,DCAN的降解速率不断提高;温度提高,活化能增大,对DCAN的去除有一定效果;随着反应时间增加,对DCAN的去除效果显著增强,其降解符合一级动力学。

Liquid-liquid extraction(LLE)-Gas Chromatograph(GC)was utilized to investigate the performance,mechanism and kinetics of oxidative degradation of dichloroacetonitrile(DCAN)by potassium ferrate under various reaction conditions.The results showed the degradation of DCAN was greatly influenced by pH value,which was the most efficient when the pH value was 6.5.In addition,the degradation rate of DCAN increased with increasing dosage of potassium ferrate,while it has limited improvement when temperature was increased.Furthermore,increasing reaction time would significantly enhanced the degradation efficiency,of which the kinetics was consistent with the first order.