Preparation of CdS-containing silica脙脙脙脙脙脙titania composites by the sol脙脙脙脙脙脙gel process

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• 作者：Costa ; Vilma C. ; Lameiras ; Fernando S. ; Sansviero ; Maria Terezinha C. ; Sim脙脙es ; A.B. ; Vasconcelos ; W.L.
• 关键词：S160 ; T250 ; S310
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2004
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：November 15, 2004
• 卷：348
• 期：Complete
• 页码：190-194
• 文件大小：378 K

摘要

Silica芒芒芒titania composite materials containing 20mol%TiO₂ were prepared by sol芒芒芒gel process using tetraethoxysilane (TEOS) and titanium isopropoxide (Ti(OPr)₄) as precursors. A two-stage hydrolysis procedure was performed in acid conditions for preparation of the TiO₂芒芒芒SiO₂ oxides. Nanometer sized crystallites of CdS were incorporated into TiO₂芒芒芒SiO₂ matrices by complex formation with thiourea, SC(NH₂)₂. The influence of the preparation route and calcination temperature on the structural characteristics and physico-chemical properties of TiO₂芒芒芒SiO₂ and CdS/TiO₂芒芒芒SiO₂ materials was studied by means of nitrogen physisorption, X-ray diffraction, infrared spectroscopy and atomic force microscopy. The results indicate that anatase phase is stable at temperatures up to 600芒芒C for TiO₂芒芒芒SiO₂ matrices and the addition of CdS particles affects the system crystallization.