期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 104, 期 3-4, 页码 268-274出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2011.03.020
关键词
Nanotubular titanic acid; P25-TiO2; Nitrogen-doping; Visible light active; Oxygen vacancy
资金
- National Natural Science Foundation of China [20973054]
Three kinds of precursors, nanotubular titanic acid (denoted as NTA), raw P25-TiO2 and novel-TiO2, were separately used to prepare visible light active N-doped TiO2 samples by annealing in flowing NH3, aiming to reveal the determinative factors on visible light response. The physicochemical properties of resultant N-doped TiO2 samples were investigated by means of X-ray diffraction (XRD). X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectra (DRS), and electron spin resonance (ESR). The visible light photocatalytic activity of the three kinds of N-doped samples was compared by monitoring the photocatalytic oxidation of propylene. It was found that N-doped TiO2 catalyst obtained by using NTA as the precursor possessed the highest photocatalytic activity. The absorption edge observed in the visible spectral region of 2.34-2.53 eV is closely related with single-electron-trapped oxygen vacancy (denoted as SETOV, i.e., F+ color centers), while another absorption edge at 2.95-3.10 is assigned to the intrinsic absorption. The visible light sensitization of N-doped TiO2 was due to the formation of SETOV in NH3-treatment process, and doped-N played a role in preventing photogenerated electrons and holes from recombination, resulting in visible light photocatalytic activity. N-doped TiO2 samples made from different precursors had different concentrations of SETOV and hence different visible light photocatalytic performance. (C) 2011 Elsevier B.V. All rights reserved.
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