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Photocatalytic Activity and Characterization of the Sol-Gel Derived Pb-Doped TiO2 Thin Films

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Abstract

Photocatalytically active Pb-doped TiO2 thin films were prepared on a soda-lime glass substrate by sol-gel dip-coating technique using TiO2 sols containing lead(II) nitrate. The thin films were characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), UV-VIS spectroscopy and X-ray diffraction (XRD). A shift of the UV-VIS absorption towards longer wavelengths was observed, which indicated a decrease in the band-gap of TiO2 upon Pb doping. XRD results showed both pure and Pb-doped TiO2 thin films were polycrystalline, anatase type, and oriented predominantly to the (101) plane. A slight shift in the d-spacing for the Pb-doped film indicated the incorporation of Pb into the TiO2 lattice to form Pb x Ti1−x O2 solid solution. AFM results showed Pb-doped TiO2 thin films were composed of larger TiO2 particles and had rougher surface, compared with un-doped TiO2 thin films. XPS results showed that except for the enrichment of Pb near the surface, Pb exists in the forms of Pb x Ti1−x O2 and PbO. Dimethyl-2,2-dichlorovinyl phosphate (DDVP) was efficiently degraded in the presence of the Pb-doped TiO2 thin films by exposing the insecticide solution to sunlight. The mechanism of photocatalytic activity enhancement of the Pb-doped TiO2 thin films was discussed.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, People's Republic of China;

    Jiaguo Yu, Bei Cheng & Xiujian Zhao

  2. Department of Chemistry and Materials Science & Technology Research Center, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, People's Republic of China

    Jiaguo Yu & Jimmy C. Yu

Authors
  1. Jiaguo Yu
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  2. Jimmy C. Yu
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  3. Bei Cheng
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  4. Xiujian Zhao
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Yu, J., Yu, J.C., Cheng, B. et al. Photocatalytic Activity and Characterization of the Sol-Gel Derived Pb-Doped TiO2 Thin Films. Journal of Sol-Gel Science and Technology 24, 39–48 (2002). https://doi.org/10.1023/A:1015109515825

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