真空活化法制备TiO_2可见光催化剂及其长效性研究

Preparation of TiO_2 Visible-light Catalyst by Vacuum Activation Method and Study on Its Long-term Efficiency

以商业TiO_2(Degussa P25)作为原料,采用简单的一步真空活化法制备了Ti^(3+)自掺杂TiO_2可见光催化剂,并通过XRD、UV-Vis、FT-IR、XPS等手段对催化剂性能进行表征。随后,以甲基橙模拟目标污染物,在可见光下对Ti^(3+)自掺杂TiO_2的可见光催化性能以及长效性进行研究。结果表明:在可见光照射下,真空活化后的P25降解甲基橙的效率明显优于纯P25。循环测试结果表明:由于Ti^(3+)较活跃,容易被氧化,因此催化剂在可见光照射下长效性并不理想。但由于可以通过真空活化法反复对催化剂进行再生,这在一定程度上弥补了其可见光活性快速流失的缺憾。

A simple vacuum activation method was applied to prepare Ti3＋ self-doping TiO2 visible-light catalyst by using commercial TiO2 （Degussa P25）as the raw material.The properties of the catalyst were characterized by XRD,UV-Vis,FT-IR and XPS.Finally,visible light catalysis property and long-term efficiency of Ti3＋ self-doping TiO2 were studied by using methyl orange as a target pollutant under the illumination of visible light.The results indicate that under the visible-light irradiation,the methyl orange degradation efficiency of P25 after vacuum activation is obviously superior to that of pure P25.Cyclic test result shows that since Ti3＋ is active,it can be easily oxidized.Thus,long-term efficiency of the catalyst is not ideal under visible light illumination.However,the catalyst can be regenerated by vacuum activation method,which could make up the rapid inactivation of visible light activity.