饮用水中三氯乙酸的紫外光降解研究

Study on the degradation of trichloroacetic acid in drinking water by UV-light

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+、NO2-、NO3-和Fe3+对降解率的影响。

High carcinogens risk of trichloroacetic acid in drinking water removed. Trichloroacetic acid with high concentration can be removed from by using ultraviolet light. The removing rate reaches 72% efficient, environment-friendly and convenient method. The exists everywhere, and is difficult to be drinking water in a relatively short time within 150 min. The results show photodegradation reaction conforms that it is a highly to the pseudo-first order reaction kinetics. The effects of initial concentration, pH of water samples, and common ions, Mn2＋, NO2-, NO3- and Fe3＋, on degradation rate are investigated.