Ag掺杂改性TiO_2催化降解水体中的邻苯二甲酸二甲酯

邻苯二甲酸酯是环境中普遍存在的有机污染物(内分泌干扰物)之一。通过湿式机械混合法制备Ag掺杂改性TiO2催化剂。光催化降解实验的结果表明Ag掺杂浓度为1×10-4mol/g,焙烧温度为400℃下所得的催化剂活性较好。对降解体系的研究表明,当催化剂的投加量为0.1~0.3 g/L、pH=5~8时降解效率较高(62.0%)。相对于催化剂的降解过程而言,其吸附作用是比较小的,而是以光催化反应为主。并利用荧光光谱对催化剂的性能进行了初步表征。

Photocatalytic Degradation of Dimethyl Phthalate in Aqueous Solution by Ag Doping TiO2

Phthalic acid esters are becoming a kind of widespread environmental organic pollutants(environmental hormone).Ag doping TiO2 modified catalyst was prepared by damp mechanical-mixed method.In the test of photocatalytic reaction,results showed that the optimized photocatalyst could be obtained under the conditions of Ag concentration 1 ×10-4 mol/g and the calcination temperature 400 ℃.The study of degradation system showed that under the conditions of amount of Ag-TiO2 catalyst 0.1~0.3 g/L,solution pH value 5~8,the degradation rate of solution can reach a better level of 62.0%.In comparison of photodegradation effect,the absorption of dimethyl phthalate to catalyst particles was relatively small,and photodegradation reaction was a more important process.Ag doping TiO2 modified catalyst was primarily characterized by FT.