强悬浮性纳米TiO2的制备、表征及光催化活性研究Ⅱ.光催化活性研究

将甲基橙溶液作为模拟废水，在紫外灯照射下，通过测量甲基橙溶液在470nm处吸光度的变化，考察了热分解制备纳米TiO2后处理过程中采用硅油淬火改性和自然冷却所得产物的光催化活性，并初步分析了两者光催化甲基橙的机理和在35min内的降解率和动力学反应过程。结果表明：两者均具有良好的光催化降解效果，且活性差别不大。但经硅油淬火改性的纳米TiO2因在水中具有强悬浮性，可更为有效地利用外部光源在工业废水的表层降解有害成分。

Study of Photocatalytic Activity,Characterization and Preparation of Supersuspended Nano-TiO2 Ⅱ.Study of Photocatalytic Activity

From the change in the absorption of methyl-orange solution at 470 nm, the photocatalytic activity of nano-TiO_2 prepared by pyrolysis method, and then by cooling treatment in silicon oil and in air respectively, was studied with methyl-orange solution as model waste water under irradiation by UV-lamp. Their photocatalytic mechanisms, the percentage of degradation in 35 min and the kinetic reactive process were also analyzed. The results show that the photocatalytic activity of both products is obvious with little (difference). However, the nano-TiO_2 powder modified with silicone oil can degrade harmful components more effectively on the surface of waste water with sunlight and other extra light.