Coaction of sub-band and doped nitrogen on visible light photoactivity of N-doped TiO2 |
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Authors: | Feng Caixia Jin Zhensheng Zhang Jingwei Wu Zhishen Zhang Zhijun |
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Institution: | Key Laboratory of Ministry of Education for Special Functional Materials, Henan University, Henan, China. |
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Abstract: | We found in our previous work that the high photoactivity of N-doped TiO2 for the oxidation of propylene under visible light was attributed to the photoactive center Vo•-NO-Ti and the formation of sub-band originated from a large amount of single-electron-trapped oxygen vacancies (denoted as Vo•; C. X. Feng, Y. Wang, Z. S. Jin, J. W. Zhang, S. L. Zhang, Z. S. Wu, Z. J. Zhang 2008], New J. Chem. 32 , 1038). In the present study, the structure of the sub-band within Eg of a representative sample N-NTA-400 was investigated by means of photoluminescence (PL) spectrometry and ultraviolet-visible light-near infrared diffuse reflectance spectra. The coaction of the sub-band and doped nitrogen on visible light photocatalytic activity of N-doped TiO2 was also investigated. The electron spin resonance spectra measured under laser irradiation (λ = 532 nm) indicate that the doped nitrogen may contribute to stabilize the trapping electron center, i.e. surface oxygen vacancy (Vo••), and hence suppress the PL, enhancing the photocatalytic activity. |
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