Mechanism and behaviors of Cr3+-doped TiO2
- 111 Downloads
TiO2 powder and TiO2 thin film on the surface of glazed ceramic tile were prepared by sol-gel method. The influences of different doping Cr3+ concentration on the photocatalytic activity of TiO2 were discussed, UV-visible and X-ray diffraction analysis were used to test the performance of TiO2 powder and film. The results indicate that photocatalytic activity of doping Cr3+-TiO2 thin film is higher than that of powder, and the interaction between Cr3+-doped and substrate can greatly enhance the photocatalytic activity. The results of X-ray diffraction and photoabsorption show that the Cr3+-doped energy level in TiO2 is 0.62 eV high from the top of valence band, which belongs to the type of deep energy level doping. On the basis of the semiconductor energy level theory and Cr3+ dopant energy level, the semiconductor energy level model of Cr3+ in TiO2 powder and thin film were established, and the doping mechanisms of Cr3+-doped in TiO2 powder and thin film were analyzed.
Key wordssol-gel method TiO2 powders and thin films Cr3+-doped photocatalytic activity
Unable to display preview. Download preview PDF.
- LI Xiao-ping, XU Bao-kun, LIU Guo-fan, et al. The research and development of photocatalytic degradation of organic contaminant over nanosized TiO2 in water [J]. Function Material, 1999, 30(3): 242–247.Google Scholar
- Sakata Y, Yamamoto T, Okazaki T, et al. Visible light response of titania photocatalyst containing copper ion [J]. Chem Lett, 1998, (12): 1253–1254.Google Scholar
- ZHANG Feng, LI Qing-lin, YANG Jian-jun, et al. Study of visible spectral sensitization of nanocrystalline TiO2 photocatalyst[J]. Chinese Journal of Catalysis, 1999, 20(3): 329–332.Google Scholar
- WANG Wei-wei, ZHANG Zhi-kun. Doping mechanism of TiO2 with transitional metal ions and there effects on light absorption characteristics[J]. Journal of Qingdao University of Science and Technology, 2003, 20(2): 102–104.Google Scholar
- YU Xiang-yang, CHENG Ji-jian. Photocatalytic activities of iron and chromium ion doped TiO2 films [J]. Journal of Inorganic Materials, 2001, 16(4): 742–746.Google Scholar
- HE Chao, YU Yun, ZHOU Cai-hua, et al. Influence Ag additive on the microstructure of TiO2 powders [J]. Journal of Inorganic Materials, 2003, 18(2): 457–464.Google Scholar
- WANG Peng, CHEN Wen-xin, LIU Ying-liang, et al. Effect of rare earth ions doping on structure and photocatalytic activity of TiO2[J]. Journal of Jinan University(Natural Science), 2003, 24(5): 81–87.Google Scholar
- LIU En-ke, ZHU Bing-sheng, LUO Jing-sheng, et al. Semiconductor Physics[M]. Beijing: Electronics Industry Press, 2004, 8: 220.Google Scholar
- Milnes A G. Deep Impurities in Semiconductors[M]. Beijing: Science Press, 1981.Google Scholar
- Fernandez A, Lassaletta G, Jimenez V M, et al. Preparation and characterization of TiO2 photocatalysis supported on various rigid supports (glass, quartz and stainless steal) comparative studies of photocatalytic activity in water purification[J]. Appl Catal B: Environ, 1995, 7(1–2): 49–63.CrossRefGoogle Scholar