Photocatalytic reaction and degradation of methylene blue on TiO2 films in vacuum: an X-ray photoelectron spectroscopy study
- 285 Downloads
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.
- 8.Q.J. Liu, X.K. Yang, Q. Liu, B.L. Wang, X.H. Wu, J. Inorg. Mater. (China) 18(6), 1331–1336 (2003)Google Scholar
- 9.X.K. Yang, Q.J. Liu, Z.Q. Zhu, Y. Li, J. Zhang, S.H. Wang, J. Funct. Mater. (China) 38(1), 101–104 (2007)Google Scholar
- 10.X.L. Cui, S.T. Wo, D.S. Ren, J. Shen, X.L. Yang, Z.J. Zhang, Acta Chim. Sin. (China) 61(11), 1872–1876 (2003)Google Scholar
- 15.D. Briggs, Surface Analysis of Polymers by XPS and Static SIMS (Chem Ind Press, Bejing, 2001), pp. 35–50Google Scholar
- 16.F.M. John, F.S. William, E.S. Peter, D.B. Kenneth, (Perkin-Elmer Corporation Physical Electronics Division, 1992), pp. 227–236Google Scholar