Photodegradation of Phenol in Water using Silica-Supported Titania Catalysts
Photodegradation of Phenol in Water using Silica-Supported Titania Catalysts
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DOI：
10.1515/jaots-1998-0208
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发表时间：
1997-11
影响因子：
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通讯作者：
L. Alemany;M. Bañares;F. Martín;M. Galan-Fereres;J. Blasco
中科院分区：
文献类型：
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作者：
L. Alemany;M. Bañares;F. Martín;M. Galan-Fereres;J. Blasco
摘要采用TiCl 3均匀沉淀法制备了含0.5 ~ 3.0理论层TiO 2的二氧化钛包覆二氧化硅微球。采用X射线衍射、紫外-可见光谱、拉曼光谱和X射线光电子能谱等手段对样品进行了表征。二氧化硅负载的沉淀物的煅烧导致二氧化钛的形成。TiO 2物种分布在表面上的小晶体，并具有类似二氧化钛的行为，具有更好的性能比散装TiO 2的苯酚的光降解。二氧化钛颗粒的晶体尺寸对于催化剂的最佳性能是关键的，因为它决定了钛位点的适当表面暴露。
Abstract Titania-coated silica microspheres containing between 0.5 and 3.0 theoretical layers of TiO2 have been prepared by homogeneous precipitation of TiCl3. All these xTiO2-SiO2 materials were characterized by X-ray diffraction, UV-Vis, FT-Raman and XPS. Calcination of silica-supported precipitates leads to the formation of titanium dioxide. TiO2 species are distributed on the surface as small anatase crystals and possess a titania-like behaviour with a much better performance than bulk TiO2 for the photodegradation of phenol. Crystal size of titania particles is critical for optimum performance of the catalyst since it determines the appropriate surface exposure of titanium sites.