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《Journal of Inorganic Materials》 2004-01
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Preparation and Photocatalytic Activity of Pb-doped TiO_2 Thin Films

ZHAO Xiu-Feng, MENG Xian-Feng, ZHANG Zhi-Hong, LIU Lang, JIA Dian-Zeng (Institute of Applied Chemistry, Xinjiang University, Urmqi 830046, China;Department of Chemistry, Changji College, Changji 831100, China)  
Pb-doped TiO2 thin films were prepared on the surface of active carbon via a sol-gel dip-coating method by using PbNO3 and Ti(OBt)4 as precursors. The as-prepared thin films were characterized by UV-VIS spectrophotometry, transmission electron microscopy (TEM) and X-ray diffraction (XRD). Photocatalytic activities of the thin films were evaluated by photocatalytic decoloration of methyl orange aqueous solution and photocatalytic degradation of omethoate aqueous solution, respectively. The results show that the rutile phase is precipitated ad well as anatase phase. With an increase in the Pb amount in the films, the rutile content increases. Therefore, the band edges of the various Pb-doped TiO2 thin films exhibit slightly red shift compared with un-doped TiO2 thin film. Photocatalytic activities of the thin films are obviously enhanced due to Pb-doping. The thin film shows the highest photocatalytic activity when the Pb/TiO2 mass ratio =1.7%. This is probably ascribed to the fact that Pb(Ⅱ) and Pb(Ⅳ) in the Pb-doped TiO2 thin films can transform each other via low-potential-capturing the photo-generated holes and electrons of TiO2 under UV illumination. Thus, the recombination of photo-generated electrons and holes is reduced, and the photocatalytic activity of thin film is enhanced.
【Fund】: 新疆大学应用化学研究所及昌吉学院科研基金
【CateGory Index】: O643.3
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