掺锡TiO_2复合薄膜的制备和光催化性能的研究

PREPARATION OF Sn-DOPED TiO_2 COMPOSITE THIN FILMS BY SOL-GEL PROCESSING AND THEIR PHOTO-CATALYTIC PROPERTIES

通过溶胶 -凝胶工艺在玻璃表面制备了均匀透明的掺锡锐钛矿型 Ti O2 光催化复合薄膜 ,用 SEM、XRD、XPS等对薄膜进行了表征。薄膜中除含有 Ti,O,Sn等元素外 ,还存在一定量的来自有机前驱物未完全燃烧的 C元素和从玻璃表面扩散到薄膜中的 Na和 Ca元素。甲基橙水溶液的光催化降解实验表明 :掺锡 Ti O2 复合薄膜的表观降解速率常数明显高于未掺锡 Ti O2 薄膜的表观降解速率常数 ,这为进一步提高 Ti O2

The uniform, transparent anatase Sn-doped TiO2 composite thin films deposited on glass substrates were prepared by sol-gel processing. The films were composed of TiO2 sphere particles in size of 50-100 nm. The thickness of the films shows some orientation effect in (101) peak. XPS results show that besides Ti, O and Sn in films there are a certain amount of residual carbon from the starting organometallic components and a small amount of Na and Ca diffused from the glass substrates. Photocatalytic degradation of methyl orange aqueous solution indicates that the sol-gel derived Sn-doped TiO2 films show good photocatalytic activity, and its apparent degradation rate constant is larger than that of undoped TiO2 films. These results are explained on the basis of the principle of charge separation in a SnO2/TiO2 composite semiconductor system.