TiO_2光催化降解水中内分泌干扰物17β-雌二醇

Photocatalytic Endocrine Disruptor 17β-Estradiol(E2) in Drinking Water by Nano Titanium Suspended System

以低压汞灯为光源,采用间歇式光氧化反应器,研究了17β-雌二醇(E2)在纳米TiO2(Degussa P-25)悬浆体系中的光催化降解.考察了溶液pH、E2初始浓度、TiO2光催化剂投加量、UV光强、H2O2、O2对E2光催化降解的影响.结果表明,TiO2光催化工艺可以有效地去除水中的E2,E2的光降解过程符合一级反应动力学模型;TiO2投加量为200 mg/L时,在14 W低压汞灯照射下,初始浓度为400μg/L的E2在自来水中的光降解一级反应速率常数为0.018 min-1,E2的光催化降解速率常数与其初始浓度、TiO2光催化剂的用量、溶液的pH值、UV光强等因素有关;外加H2O2、O2可以影响催化剂的光降解效率.

Photocatalytic degradation of endocrine disruptor 17β-estradiol （E2）in drinking water by nano titanium（ Degussa P-25 ） suspended system was studied in a low pressure mercury lamp batch photo-reactor. Effects of reaction pH, E2 concentration, applied TiO2 dose, UV light power, H2O2 , O3 were investigated respectively. The results show that the removal of E2 was effectively, The rate of photodegradation in aqueous solution followed first-order kinetics. When TiO2 was dosed as 200 mg/L, irradiated by a 14 W low pressure mercury vapor discharge lamp, the first order photodegradation rate constant of E2（initial concentration was 400 μg/L） in tap water was 0.018 min^-1 . The photodegradation rate constant of E2 was related to the influential factors mentioned above and that it can be affected by add H2O2, O2.