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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。
Ti 3+ self-doping TiO 2 visible light catalysts were prepared by a simple one-step vacuum activation method using commercial TiO 2 (Degussa P25) as raw material. The catalytic properties of the catalyst were characterized by XRD, UV-Vis, FT-IR and XPS. Characterization. Subsequently, methyl orange was used to simulate the target pollutants and the photocatalytic activity and long-term efficiency of Ti 3+ self-doped TiO 2 under visible light were studied. The results showed that under visible light irradiation, the efficiency of P25 degrading methyl orange after vacuum activation was obviously better than that of pure P25. The results of the cycle test show that the long-term effect of the catalyst under visible light irradiation is not satisfactory because Ti 3+ is more active and easily oxidized. However, since the catalyst can be regenerated repeatedly by the vacuum activation method, it compensates for the shortcomings of the rapid loss of visible light activity to a certain extent.