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以钛酸丁酯、硝酸铋、硝酸铁为主要原料,采用溶胶-凝胶法制备了铁铋共掺杂TiO_2复合薄膜。通过XRD、UV-VIS、及降解率等方法对样品进行了表征。以甲基橙作为降解物,考察Bi~(3+)和Fe~(3+)共掺杂对TiO_2复合薄膜催化剂的光催化活性影响。结果表明:Bi~(3+)和Fe~(3+)共掺杂TiO_2复合薄膜导致吸收带边红移,纳米TiO_2复合薄膜光催化活性有了较大的提高。可能是抑制了光电子的复合,减小了禁带宽度,加速了界面电子电荷转移速率。Bi~(3+)和Fe~(3+)共掺杂TiO_2复合薄膜的光催化活性在紫外灯照射下高于单一掺杂TiO_2复合薄膜的光催化活性,在500℃光催化降解率达到92.86%。
Bismuth titanate co-doped TiO 2 films were prepared by sol-gel method using butyl titanate, bismuth nitrate and ferric nitrate as the main raw materials. The samples were characterized by XRD, UV-VIS, and degradation rate. Using methyl orange as degradation product, the effects of co-doping Bi ~ (3+) and Fe ~ (3+) on the photocatalytic activity of TiO_2 composite thin film catalysts were investigated. The results show that the photocatalytic activity of nano-TiO 2 composite thin films is greatly enhanced by co-doping TiO 2 film with Bi 3+ and Fe 3+. It is possible to suppress the photoelectron recombination, reduce the forbidden band width and accelerate the interfacial electron charge transfer rate. The photocatalytic activity of Bi ~ (3+) and Fe ~ (3+) co-doped TiO_2 composite films was higher than that of single doped TiO_2 composite films under ultraviolet light irradiation, and the photocatalytic degradation rate at 500 ℃ was 92.86 %.