Design of Porous Silica Supported Tantalum Oxide Hollow Spheres Showing Enhanced Photocatalytic Activity

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• 作者：Manu Sharma ; Debashree Das ; Arabinda Baruah ; Archana Jain ; Ashok K. Ganguli
• 刊名：Langmuir
• 出版年：2014
• 出版时间：March 25, 2014
• 年：2014
• 卷：30
• 期：11
• 页码：3199-3208
• 全文大小：686K
• 年卷期：v.30,no.11(March 25, 2014)
• ISSN：1520-5827

文摘

Silica-supported tantalum oxide (ST) hollow spheres were designed for photocatalytic applications in the UV range of 4.1 to 4.8 eV. These nanostructures with a variable diameter of 100鈥?50 nm and shell thickness of 24鈥?8 nm were obtained by the hydrothermal treatment of tantalum isopropoxide and tetraethylorthosilicate at 120 掳C for 48 h in the presence of cetyl trimethyl ammonium bromide, which was used as a capping agent. The maximum observed surface area was found to be 610 m²/g and pore size distribution of ST hollow spheres varied from 13.4 to 19.0 nm. Lewis acidity of silica and the contact area between SiO₂ and Ta₂O₅ plays a crucial role in controlling the photocatalytic properties of the ST hollow spheres. We observe a remarkable 6脳 enhancement in the photoactivity of silica-supported tantalum oxide hollow spheres compared to pure Ta₂O₅.