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《Chinese Journal of Catalysis》 2007-03
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Synthesis and Characterization of Mesoporous TiO_2-SO_4~(2-)

SHEN Jun, LUO Ni, ZHANG Mingjun, TIAN Congxue, ZHANG Zhao*(College of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China)  
Mesoporous anatase TiO_2-SO_4~(2-) with high thermal stability was synthesized without organic templates. The sample was characterized using X-ray diffraction, N2 adsorption, scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy, and its photocatalytic activity was tested. SO2-4 that is bonded to free-OH on pore walls of metatitanic acid during the calcination acts as the pore structure-directing agent and pore structure support. After calcination at 500 ℃, the mesoporous TiO_2-SO_4~(2-) has a surface area of 202.2 m2/g and an average pore diameter of 2.8 nm. The electron inductive effect of S=O in TiO_2-SO_4~(2-) not only makes adjacent Ti a superacidic center but also causes a red shift of the adsorption spectrum of the sample by 30 nm. Its photocatalytic activity is also enhanced obviously.
【Fund】: 国家自然科学基金(50474071).
【CateGory Index】: O614.411
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