Abstract: In order to degrade the amounts of trichloroacetonitrile(TCAN) contained in drinking water,ultraviolet light has been used for its degradation. The influences of the UV intensity,pH,TCAN initial concentration and temperature on TCAN degradation rate have been investigated. The results show that the degradation rate of TCAN is increased gradually with the increase of photons,pH and UV light intensity. It can be improved greatly in sub-alkaline environment due to the hydrolysis of TCAN and the irradiation of UV. It can also be improved gradually with the increase of TCAN initial concentration. Temperature do not have obvious influence on TCAN degradation rate. The rule of UV technology for the degradation of TCAN in drinking water conforms to the first-order kinetics,and the reaction rate constant is 0.002 66 when UV intensity is 110 μW/cm².

Key words: drinking water, disinfection by-products, trichloroacetonitrile(TCAN), ultraviolet light(UV), kinetics

摘要： 为降解饮用水中的三氯乙腈（TCAN），采用紫外光（UV）降解TCAN。考察了紫外光强度、pH、TCAN初始浓度和温度对TCAN降解速率的影响。结果表明：随紫外光强度增加，拥有的光子会增加；pH增加，TCAN降解率逐步提高，偏碱性环境下由于TCAN会发生水解，再加上紫外光的作用，降解效率大幅提高；TCAN初始浓度增加，降解率逐步提高。温度对TCAN的降解率影响不明显。UV技术降解饮用水中TCAN的规律符合一级反应动力学，紫外灯光强度为110 μW/cm²的反应速率常数为0.002 66。

关键词: 饮用水, 消毒副产物, 三氯乙腈（TCAN）, 紫外光（UV）, 动力学

CLC Number: 

• TU991.2