Abstract:

High carcinogens risk of trichloroacetic acid in drinking water exists everywhere,and is difficult to be removed.Trichloroacetic acid with high concentration can be removed from drinking water in a relatively short time by using ultraviolet light.The removing rate reaches 72% within 150 min.The results show that it is a highly efficient,environment-friendly and convenient method.The photodegradation reaction conforms to the pseudo-first order reaction kinetics.The effects of initial concentration,pH of water samples,and common ions,Mn²⁺,NO_2-,NO_3- and Fe³⁺,on degradation rate are investigated.

Key words: drinking water, trichloroacetic acid, UV-light degradation

摘要：

饮用水中高致癌物风险物三氯乙酸,普遍存在且难以去除。采用紫外光光降解可在较短时间内去除饮用水中高浓度的三氯乙酸,150 min内去除率达到72%。结果表明,这是一种高效、环保、简便的去除方法。其光降解反应符合一级反应动力学模型。实验还考察了水样品pH及常见离子Mn²⁺、NO_2-、NO_3-和Fe³⁺对降解率的影响。

关键词: 饮用水, 三氯乙酸, 紫外光降解

CLC Number: 

• TU991.2

• TQ085+.4