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《CHINESE JOURNAL OF CATALYSIS》 1999-03
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STRUCTURE OF TITANIA BASED SOLID SUPERACIDS AND THEIR PROPERTIES FOR PHOTOCATALYTIC OXIDATION

Fu Xianzhi, Ding Zhengxin, Su Wenyue (Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002) Li Danzhen (Department of Electronic Science and Applied Physics, Fuzhou University, Fuzhou 350002)  
Porous SO 2- 4/TiO 2 solid superacid catalysts with high specific surface area were prepared by sol gel method and characterized by X ray diffraction (XRD), X ray photoelectron spectroscopy (XPS), N 2 sorption analysis applying BET method, and UV Vis reflectance spectroscopy. Photocatalytic oxidation of CH 3Br, C 6H 6 and C 2H 4 in air stream was studied over pure and sulfated TiO 2 catalysts, respectively. The results showed that the photocatalytic and structural properties of TiO 2 were greatly improved by sulfation. The sulfated TiO 2 (SO 2- 4/TiO 2) exhibited excellent reaction activity for photocatalytic decomposition of the organic compounds. When compared to unmodified TiO 2, the sulfated TiO 2 exhibited higher resistance to crystal phase transformation from anatase to rutile, higher resistance to crystal grain growth, higher specific surface area. As a result of sulfation, the band gap of SO 2- 4/TiO 2 increased and the band edge blue shifted to yield larger redox potential, leading to the increased photocatalytic efficiency.
【Fund】: 国家产业化前期关键技术开发项目; 国家自然科学基金;福建省自然科学基金
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