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Coaction of Sub‐band and Doped Nitrogen on Visible Light Photoactivity of N‐Doped TiO 2
Author(s) -
Feng Caixia,
Jin Zhensheng,
Zhang Jingwei,
Wu Zhishen,
Zhang Zhijun
Publication year - 2010
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2010.00808.x
Subject(s) - electron paramagnetic resonance , visible spectrum , doping , photocatalysis , photoluminescence , photochemistry , materials science , ultraviolet , oxygen , irradiation , nitrogen , analytical chemistry (journal) , chemistry , nuclear magnetic resonance , physics , optoelectronics , catalysis , biochemistry , organic chemistry , chromatography , nuclear physics
Abstract We found in our previous work that the high photoactivity of N‐doped TiO 2 for the oxidation of propylene under visible light was attributed to the photoactive center V o • ‐NO‐Ti and the formation of sub‐band originated from a large amount of single‐electron‐trapped oxygen vacancies (denoted as V o • ; 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 E g 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 TiO 2 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 (V o •• ), and hence suppress the PL, enhancing the photocatalytic activity.