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《Journal of Molecular Catalysis》 2012-02
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Preparation,Characterization and Photo-catalytic Activities of N-TiO_2 with Urea as Nitrogen Source

CAI Li,ZHANG Shu(College of Chemistry and Material,Sichuan Normal University,Chengdu 610068,China)  
Nitrogen-doped TiO2 catalysts(N-TiO2) with different nitrogen contents were prepared by a modified sol-gel method,using tetrabutyl titanate as the precursor and urea as the nitrogen source.Their structure and physical properties were characterized by means of X-ray diffraction(XRD),UV-Vis absorption spectroscopy,photoluminescence(PL),and X-ray photoelectron spectroscopy(XPS).The results show that the doping of Nitrogen can effectively suppress the phase transformation of TiO2 from anatase phase to rutile phase,can extent the absorption edge wavelength to visible light,and can accelerate the separation of electron-hole pairs and improve the photo-catalytic activity.The photo-catalytic activities of N-TiO2 were evaluated using the photo-catalytic reduction of Cr(VI) and oxidation of phenol under visible light irradiation.It was found that the 9% N-TiO2-500 exhibits higher activities than those of Degussa P25 and TiO2 without Nitrogen,and had an excellent long-term stability and can be repeated used.
【Fund】: 国家自然科学基金(20776090);; 四川省教育厅面上项目(11ZB074)
【CateGory Index】: O643.36
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