掺铅TiO_2薄膜的制备及光催化性能

Synthesis and photocatalytic capability of Pb-TiO_2 film

以钛酸四丁酯为前驱体,采用溶胶-凝胶法在玻璃板表面制得均匀的TiO2,并利用浸渍法镀Pb2+得到掺铅的TiO2,用紫外漫反射、荧光光谱分析等手段对其进行了表征.研究结果表明,掺杂铅离子使TiO2的荧光峰明显增强,吸收带边发生红移,在紫外光区和可见光区的吸收明显增强.以紫外灯为光源,通过对甲基橙的光催化降解研究,发现掺铅TiO2薄膜的光催化活性明显大于掺Ag,Bi及纯TiO2薄膜,这是提高TiO2光催化活性的有效方法.

A TiO2 catalyst doped by Pb^2＋ was prepared by the sol-gel method and characterized by DRS and FS. The experimental results showed that Pb^2＋ strengthened the TiO2 fluorescence apex, the absorbance band edge moved in the red direction, and the absorbance strengthened obviously both in the UV range and in the visible range. Compared with Ag-TiO2, Bi-TiO2 and TiO2 films, the Pb^2＋-doped TiO2 thin film has the highest photocatalytic activity by studying the degradation of methyl orange under UV-ray, which is an effective way to increase the photocatalytic activity.