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Soft-chemical method for fabrication of SnO–TiO2 nanocomposites with enhanced photocatalytic activity

Published online by Cambridge University Press:  31 May 2013

Qiwen Yan ,
Jingyu Wang ,
Xijiang Han  and
Zhihong Liu
Qiwen Yan
Affiliation:
Department of Chemistry, Harbin Institute of Technology, Harbin 150001, China
Jingyu Wang*
Affiliation:
Department of Chemistry, Harbin Institute of Technology, Harbin 150001, China
Xijiang Han
Affiliation:
Department of Chemistry, Harbin Institute of Technology, Harbin 150001, China
Zhihong Liu*
Affiliation:
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

The present work reports a soft-chemical pathway for preparing SnO–TiO2 composite nanocrystallites as photocatalyst through co-hydrolysis of tetrabutyl titanate and tin (II) chloride followed by acidic peptization of the hydrolysate under mild conditions. The procedure is simple and straightforward, from which a well-dispersed semitransparent hydrosol sample is obtained. The freestanding nanocrystallites observed in the as-prepared composite show diameters of 3–5 nm. TiO2 nanoparticles have almost entirely transformed into anatase phase, and the trace amounts of Sn in existence are mainly found in SnO crystals with tetragonal structure. The photocatalytic activity of the SnO–TiO2 composites is confirmed through the photodegradation of methyl blue dye under visible light irradiation (λ > 420 nm). As a p-type semiconductor, the incorporated SnO effectively improves the photocatalytic activity of TiO2 through promoting the separation of photo-generated charge carriers, inhibiting their recombination, and facilitating the reduction of O2 by the photo-generated electrons.

Keywords

compositephotochemicalenvironmentally protective
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1862 - 1869
Copyright
Copyright © Materials Research Society 2013 

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