TiO2表面相变及其光催化性能的紫外拉曼光谱研究

摘要

以钛酸四丁酯为前驱体,采用沉淀法制备了纳米 TiO2,利用 X-射线粉末衍射(XRD)、紫外拉曼光谱(The UV Raman Spectroscopy)对样品进行了晶相结构表征。结果表明,焙烧温度的改变能在一定程度上控制TiO2晶相的改变。在此基础上,以罗丹明B为目标降解物考察了 TiO2表面晶相对光催化活性的影响。结果表明,纳米TiO2在紫外光照射下具有良好的光催化性能,光催化降解罗丹明B的活性主要与TiO2的表面晶相有关。%Nano TiO2 photocatalysts were prepared by coprecipitation method with ethanol as solvent and tetrabutyl titanate for precursor.Based on the results from XRD and UV Raman spectroscopy,it can be concluded that the bulk and surface crystal phase and phase composition can be controlled by changing the calcinable temperature.The Rhodamine B was used as the reactant to study influence of the surface phase on photocatalytic activity of TiO2 .It was found that the photocatalytic activity for decomposition of Rhodamine B was directly related to its surface phase.Furthermore,the photocatalytic activity can be enhanced when the surface phase was in the mixture of anatase and rutile.