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Photocatalytic reaction and degradation of methylene blue on TiO2 films in vacuum: an X-ray photoelectron spectroscopy study

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Abstract

Photocatalytic reaction and degradation of methylene blue on TiO2 films illuminated by ultraviolet light in air and in vacuum were studied by X-ray photoelectron spectroscopy (XPS). The results show that TiO2 film has photocatalytic activity in high vacuum, while the oxygen-containing groups on TiO2 film play a very important role in maintaining photocatalytic reaction, a certain nitrogenous group has been removed from the methylene blue molecule to make the atomic ratio of its N and S decrease from 2.83 to 2.09, and form the intermediate reaction products containing benzene ring and N, S heterocycle, which can be degraded incompletely.

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Acknowledgments

The authors thank the National Natural Science Foundation of China (Projects 20863003) and Yunnan Province (Projects 2007PY01-9) for financial support.

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Authors and Affiliations

  1. Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming, 650093, People’s Republic of China

    XiKun Yang, Liang Xiong, XuanZhi Hu, Bin He & GuoDong Chu

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  1. XiKun Yang
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  2. Liang Xiong
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  3. XuanZhi Hu
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  4. Bin He
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Correspondence to XiKun Yang.

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Yang, X., Xiong, L., Hu, X. et al. Photocatalytic reaction and degradation of methylene blue on TiO2 films in vacuum: an X-ray photoelectron spectroscopy study. Res Chem Intermed 38, 67–75 (2012). https://doi.org/10.1007/s11164-011-0326-7

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  • DOI: https://doi.org/10.1007/s11164-011-0326-7

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