Photocatalytic reaction and degradation of methylene blue on TiO2 films in vacuum: an X-ray photoelectron spectroscopy study
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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.
KeywordsPhotocatalysis TiO2 film Vacuum Methylene blue XPS
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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