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《Acta Chimica Sinica》 2007-23
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Comparative Research on Degradation of Organic Pollutants with Nitrogen-Doped TiO_2 Photocatalyst under Visible Light

FANG, Yan-Fen HUANG, Ying-Ping* LIU, Li-Ming LUO, Guang-Fu (Alan G. MacDiarmid Research Institute for Renewable Energy, Three Gorges University, Yichang 443002)  
TiO2 nanoparticles doped with different content of nitrogen were prepared by sol-gel method, and preliminarily characterized by means of XRD, TEM and UV-vis spectra. The concentration of nitrogen of N/TiO2 was detected using XPS and elemental analyzer method (EA). It was confirmed by XPS that oxygen sites were substituted by nitrogen atoms and Ti3+ species was formed on the surface of the nitrogen-doped titania; UV-visible reflectance spectra measured the band gap (Eg) of nitrogen-doped titania in different content, which indicated that an N-induced midgap level was formed from above the valence band (O 2p). The Eg of N/TiO2 could be estimated to be 2.50 eV when the molar ratio of N to Ti was 0.0880, which was narrowest. The photocatalytic degradation of sulforhodamine-B (SRB) and 4-chlorophenol (4-CP) in aqueous solution was used as probe reactions to evaluate their photocatalytic activity with different doped content. It indicated that the N/TiO2 powder with molar ratio nN/nTi=0.0880 exhibited highly catalytic activity for degradation of SRB under visible light irradiation. The formed oxidation species, total organic carbon (TOC), chemical oxygen demand (CODCr) and infrared spectrophotometry (IR) assays showed that the mechanism of photocatalytic degradation involved the excitation of electrons from the isolated N 2p orbitals to the Ti 3d orbitals, generating ·OH for degradation of organic compounds.
【Fund】: 国家自然科学基金(Nos.20373074 50639070);; 湖北省青年杰出人才基金(No.2005ABB030);; 湖北省教育厅自然科学重大资助项目(No.2004z001)资助项目.
【CateGory Index】: X70
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