负载型纳米TiO_2光催化降解水中微量二氯乙烷

Photo-catalytic Degradation of Soluble Dichloroethane in Water with Fixed Nanometer Titanium Dioxide

利用负载型纳米 Ti O2 作为光催化剂对水中微量二氯乙烷进行紫外光催化降解处理。研究表明二氯乙烷光催化降解属表观一级反应动力学过程。不同的二氯乙烷初始浓度、光强和催化剂用量等因素对二氯乙烷的光催化降解具有不同的效果。初始浓度在 4.82 1～ 2 2 .83 8mg/ L范围内 ,随着初始浓度的增大 ,二氯乙烷光催化降解的反应速率常数持续增大 ;光强的平方根与反应速率常数呈直线相关 ;随催化剂用量的增加 。

Photo catalytic degradation experiments of soluble dichloroethane in water were conducted using fixed nanometer TiO 2 as photo catalyst under ultraviolet light. The results reveal that the degradation process is a pseudo first order reaction kinatically. The kinetic equations and parameters show that the degradation efficiencies of dichloroethane in water are influenced by the initial concentrations of dichloroethane, amounts of photo catalyst and illumination intensities. The rate constant of photo catalytic degradation of dichloroethane increases with the increasing of the initial concentration, the illumination intensities, and the doses of photo catalyst.