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《CHINESE JOURNAL OF CATALYSIS》 1998-02
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RELATIONSHIP BETWEEN OPTICAL SURFACE PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF TITANIUM DIOXIDE

Sun Fengyu, Wu Ming, Li Wenzhao, Li Xinyong, Gu Wanzhen, Wang Fudong(Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023)  
The influence of heat treatment of TiO_2 in hydrogen atmosphere on its photocatalytic performance in degradation of phenol in aqueous suspension is investigated. Diffuse reflectance spectra, luminescence spectra and X-ray diffraction techniques have been used to characterize the optical absorption, fluorescence intensity and crystalline phase of TiO_2. It is found that the photocatalytic activity of TiO_2 consists well with its optical absorbance and fluorescence intensity. Based on this, we propose a concept, optical surface state, and assume that the optical surface state related closely with photocatalytic activity is determined by the amount and the ratio of hydroxyl groups to the titanium cations of lower valence on the surface of TiO_2.
【Fund】: 国家自然科学基金 中国科学院基础局95预研项目
【CateGory Index】: O647,O643
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