CAI Li, ZHANG Shu
(College of Chemistry and Material, Sichuan Normal University, Chengdu 610068, China)
Abstract: Nitrogen-doped TiO2 catalysts (N-TiO2) with different nitrogen content 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, 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 has an excellent long-term stability and can be repeated used.
Key words: N-TiO2; photo-catalysis; sol-gel method; potassium dichromate; phenol
E-mail:sys1997@163.com
Journal of Molecular Catalysis, Vol. 26, Issue 2, 2012, 184-191
