期刊
JOURNAL OF CATALYSIS
卷 276, 期 2, 页码 201-214出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.07.033
关键词
Nitrogen doping; TiO2; Photocatalyst; Visible light; Acetone; Photoactive centers
资金
- National Natural Science Foundation of China [21003021, 20673020, 20873022]
- National Basic Research Program of China [2007CB613]
- National High Tech R&D Program of China [2008AA06Z326]
- Natural Science Foundation of Fujian Province of PR China [2010J05024]
- Program for Changjiang Scholars and Innovative Research Team in University Fujian Province of PR China [PCSIRT0818]
- Program for New Century Excellent Talents in University Fujian Province of PR China [XSJRC2007-19]
This paper focuses on the photoactive centers of nitrogen-doped TiO2 visible light photocatalyst A series of N-doped TiO2 materials were prepared by a post-nitridation route at the temperature range of 400800 C The photocatalytic oxidation of acetone as a model reaction was used to evaluate the photocatalytic properties of the materials The chemical states of doped nitrogen species were characterized by near-edge X-ray absorption fine structure X-ray photoelectron and electron paramagnetic resonance spectroscopes The results reveal that four types of N species exist alone or together in TiO2 depending on nitridation temperature The photoactive centers of the materials are a diamagnetic [O-Ti4+-N3--Ti4+-V-0(-)] cluster containing an oxygen vacancy and a nitrogen anion The visible light photocatalysis of N-doped TiO2 is proposed to be initiated by an excited state of the surface [Ti4+-N3-] unit (C) 2010 Elsevier Inc All rights reserved
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