TiO_2光催化活性的研究

Study of the photocatalytic activity using TiO_2 as the catalyst

采用搅拌式光催化反应器,以中压汞灯作光源,甲基橙为模型化合物,考察了SO42- 处理及Cu2+对TiO2 光催化活性的影响.研究发现,SO42- 处理以及Cu2+ 的加入都能够提高TiO2 的光催化活性,在此反应体系中甲基橙的降解为一级反应,甲基橙的光催化降解速率与光强度成正比,TiO2 光催化剂的投加量为150 mg/L,Cu2+的加入量为200μg/L时光催化效果最佳.

The effects of Cu 2+ and SO_4 2- treatment on the photo catalytic activity of TiO_2 were investigated using methyl orange as a model compound and middle pressure mercury lamp as light source in a stirred photo catalytic reactor. The results show that SO_4 2- treatment and the addition of Cu 2+ can improve the photo catalytic activity of TiO_2 and degradation rate of methy1 orange is a first-order reaction under the present reaction conditions. The photo catalytic degradation rate of methyl orange is directly proportional to the light intensity. Moreover, the optimum photo catalytic degradation is gained when the quantums of TiO_2 and Cu 2+ are 150 mg/L and 200 μg/L respectively.