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Photocatalytic activities of tin(IV) oxide surface-modified titanium(IV) dioxide show a strong sensitivity to the TiO 2 crystal form
Jin, Qiliang; Fujishima, Musashi; Nolan, Michael; Iwaszuk, Anna; Tada, Hiroaki
Surface modification of rutile TiO2 with extremely small SnO2 clusters gives rise to a great increase in its UV light activity for degradation of model organic water pollutants, while the effect is much smaller for anatase TiO2. This crystal form sensitivity is rationalized in terms of the difference in the electronic modification of TiO2 through the interfacial Sn−O−Ti bonds. The increase in the density of states near the conduction band minimum of rutile by hybridization with the SnO2 cluster levels intensifies the light absorption, but this is not seen with modified anatase. The electronic transition from the valence band to the conduction band causes the bulk-to-surface interfacial electron transfer to enhance charge separation. Further, electrons relaxed to the conduction minimum are smoothly transferred to O2 due to the action of the SnO2 species as an electron transfer promoter.
Keyword(s): Visible light; Organic Compounds; Anatase; Rutile; Particles; Oxidation
Publication Date:
2012
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University College Cork
Funder(s): Science Foundation Ireland; Higher Education Authority
Citation(s): Jin, Q., Fujishima, M., Nolan, M., Iwaszuk, A. and Tada, H. (2012) 'Photocatalytic activities of tin(IV) oxide surface-modified titanium(IV) dioxide show a strong sensitivity to the TiO 2 crystal form'. Journal of Physical Chemistry C, 116(23), pp. 12621-12626. doi:10.1021/jp302493f
Publisher(s): American Chemical Society
File Format(s): application/pdf
First Indexed: 2016-09-30 05:36:13 Last Updated: 2017-11-04 06:37:00