The role of crystal phase in determining photocatalytic activity of nitrogen doped TiO2

Liu, Gang, Wang, Xuewen, Chen, Zhigang, Cheng, Hui-Ming and Lu, Gao Qing (Max) (2009) The role of crystal phase in determining photocatalytic activity of nitrogen doped TiO2. Journal of Colloid and Interface Science, 329 2: 331-338. doi:10.1016/j.jcis.2008.09.061


Author Liu, Gang
Wang, Xuewen
Chen, Zhigang
Cheng, Hui-Ming
Lu, Gao Qing (Max)
Title The role of crystal phase in determining photocatalytic activity of nitrogen doped TiO2
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2009-01-15
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jcis.2008.09.061
Volume 329
Issue 2
Start page 331
End page 338
Total pages 8
Place of publication Washington, D.C.
Publisher Academic Press
Language eng
Subject C1
100708 Nanomaterials
970109 Expanding Knowledge in Engineering
Abstract Two series of nitrogen doped TiO2 samples with different ratios of anatase to rutile phases were prepared by milling the mixture of P25 TiO2 and C6H12N4 in air and gaseous NH3 atmosphere, respectively. Compared to air, NH3 atmosphere plays an important role in delaying the crystallite transformation from anatase to rutile in the mechanochemical reaction of TiO2 and C6H12N4. In contrast to the previously reported results for pure TiO2, it is found that nitrogen doped TiO2 with higher content of rutile phase demonstrates higher photocatalytic activity in photodegrading pollutant Rhodamine B under both UV light and visible light irradiation (lambda > 420 nm), and the amount of the surface-adsorbed water and hydroxyl groups on nitrogen doped TiO2 have little correlations with their crystallite phases (anatase or rutile) and photocatalytic activity. The more abundant surface states characterized by photoluminescence spectroscopy together with the lowered valence band maximum of rutile TiO2 by nitrogen doping are considered as the key factors for the higher activity of nitrogen doped TiO2 with higher content of rutile phase.
Keyword TiO2
Visible-light photocatalysis
Anatase
Rutile
Nitrogen Doping
Crystal phase
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Article history: Received 8 August 2008 Accepted 17 September 2008 Available online 27 September 2008

Document type: Journal Article
Sub-type: Article (original research)
Collection: Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Thu, 03 Sep 2009, 09:12:26 EST by Mr Andrew Martlew on behalf of Aust Institute for Bioengineering & Nanotechnology