Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada.
ACS Appl Mater Interfaces. 2012 Nov;4(11):6062-70. doi: 10.1021/am3016922. Epub 2012 Nov 6.
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⁻¹ and anatase phase crystallization, which exhibited high adsorption capacity for methylene blue dye and good photocatalytic activity without requiring high-temperature calcination.
通过在温和条件下进行单步水热二氧化硅刻蚀反应，成功合成了具有强韧、单分散、介孔的二氧化钛（TiO₂）亚微米级空心球。在不使用有毒试剂的情况下，实现了高效的二氧化硅（SiO₂）去除，并确定了独特的可控二氧化硅再沉积机制，赋予空心球优异的结构完整性。系统研究和优化了影响刻蚀过程的水热反应参数，包括 pH 值、温度和二氧化硅浓度，以制备二氧化硅模板空心结构。所得的处理条件可得到比表面积约为 300 m² g⁻¹、具有锐钛矿相结晶的 TiO₂空心球，其对亚甲基蓝染料表现出高吸附能力，并且无需高温煅烧即可表现出良好的光催化活性。
