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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Well-crystallized mesoporous TiO_2 shells for enhanced photocatalytic activity: Prepared by carbon coating and silica-protected calcination
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Well-crystallized mesoporous TiO_2 shells for enhanced photocatalytic activity: Prepared by carbon coating and silica-protected calcination

机译：结晶良好的介孔TiO_2壳，可增强光催化活性：通过碳涂层和二氧化硅保护的煅烧制备

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摘要

Mesoporous anatase-phase TiO_2 hollow shells were successfully fabricated by the solvothermal and calcination process. This method involves preparation of SiO2@TiO_2 core-shell colloidal templates, sequential deposition of carbon and then silica layers through solvothermal and sol-gel processes, crystallization of TiO_2 by calcination and finally removal of the inner and outer silica to produce hollow anatase TiO_2 shells. The prepared samples were characterized by transmission electron microscopy, X-ray diffraction, N2 adsorption-desorption isotherms and UV-vis absorption spectroscopy. The results show that a uniform carbon layer is coated on the core-shell particles through the solvothermal process. The combustion of carbon offers the space for the TiO_2 to further grow into large crystal grains, and the outer silica layer serves as a barrier against the excessive growth of anatase TiO_2 nanocrystals. Furthermore, the initial crystallization of TiO_2 generated in the carbon coating step and the heat generated by the combustion of the carbon layer allow the crystallization of TiO_2 at a relatively low temperature without changing the uniform structure. When used as photocatalysts for the oxidation decomposition of Rhodamine B in aqueous solution under UV irradiation, the hollow TiO_2 shells showed enhanced catalytic activity. Moreover, the TiO_2 hollow shells prepared with optimal crystallinity by this method showed a higher performance than commercial P25 TiO_2.
机译：通过溶剂热和煅烧工艺成功制备了介孔锐钛矿相TiO_2空心壳。该方法包括制备SiO2 @ TiO_2核-壳胶体模板，通过溶剂热和溶胶-凝胶工艺依次沉积碳和二氧化硅层，通过煅烧使TiO_2结晶，最后去除内部和外部二氧化硅以生产空心锐钛矿TiO_2壳。通过透射电子显微镜，X射线衍射，N2吸附-解吸等温线和UV-vis吸收光谱对制备的样品进行表征。结果表明，通过溶剂热过程，均匀的碳层被覆盖在核-壳颗粒上。碳的燃烧为TiO_2进一步成长为大晶粒提供了空间，而外部二氧化硅层则成为阻止锐钛矿型TiO_2纳米晶体过度生长的障碍。此外，在碳涂覆步骤中产生的TiO 2的初始结晶和由碳层的燃烧产生的热量允许在相对低的温度下TiO 2的结晶而不会改变均匀的结构。当用作光催化若丹明B在水溶液中在紫外线照射下氧化分解时，空心TiO_2壳表现出增强的催化活性。此外，用这种方法制备的具有最佳结晶度的TiO_2中空壳比商用P25 TiO_2具有更高的性能。

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