Mesoporous Hollow Sphere Titanium Dioxide Photocatalysts through Hydrothermal Silica Etching
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- 作者：Tim Leshuk ; Stuart Linley ; George Baxter ; Frank Gu
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2012
- 出版时间：November 28, 2012
- 年：2012
- 卷：4
- 期：11
- 页码：6062-6070
- 全文大小：454K
- 年卷期：v.4,no.11(November 28, 2012)
- ISSN：1944-8252
文摘
Robust, monodisperse, mesoporous titanium dioxide (TiO2) submicrometer hollow spheres were synthesized through a single step hydrothermal silica etching reaction under mild conditions. Efficient silica (SiO2) removal was achieved without the use of toxic reagents, and a unique controllable silica redeposition mechanism was identified, imparting the hollow spheres with excellent structural integrity. The parameters of the hydrothermal reaction affecting the etching process, including pH, temperature, and silica concentration, were systematically investigated and optimized for the production of silica-templated hollow structures. The resulting processing conditions yielded TiO2 hollow spheres with a surface area of 300 m2 g鈥? and anatase phase crystallization, which exhibited high adsorption capacity for methylene blue dye and good photocatalytic activity without requiring high-temperature calcination.