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Enhanced photocatalytic activity of TiO2–niobate nanosheet composites

Published online by Cambridge University Press:  19 November 2012

Jian Liu ,
Eric J. Nichols ,
Jane Howe  and
Scott T. Misture
Jian Liu
Affiliation:
Department of Materials Science & Engineering, Kazuo Inamori School of Engineering, Alfred University, Alfred, New York 14802
Eric J. Nichols
Affiliation:
Department of Materials Science & Engineering, Kazuo Inamori School of Engineering, Alfred University, Alfred, New York 14802
Jane Howe
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Scott T. Misture*
Affiliation:
Department of Materials Science & Engineering, Kazuo Inamori School of Engineering, Alfred University, Alfred, New York 14802
*
a)Address all correspondence to this author. e-mail: misture@alfred.edu
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Abstract

Protonated niobate nanosheets, H1.8Bi0.2CaNaNb3O10 (BCNN), were synthesized using a new organic-free simultaneous ion exchange and exfoliation process from the Aurivillius phase Bi2CaNaNb3O12. Nanosheet/TiO2 composites were prepared by thermal treatment of physical mixtures of commercially available anatase TiO2 and the nanosheet suspension. Methylene blue (MB) dye degradation studies for the composite show a clear correlation between the MB surface adsorption and the degradation rate. The composite exhibits strongly enhanced photocatalytic activity as the calcination temperature increases, suggesting the possibility of charge transfer at the BCNN–TiO2 interface and the existence of Nb5+ and O2−acid–base pairs. Both phenomena are attributed to the processing approach, which includes topochemical dehydration of the BCNN nanosheets during heat treatment.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 3: Focus Issue: Titanium Dioxide Nanomaterials , 14 February 2013 , pp. 424 - 430
Copyright
Copyright © Materials Research Society 2012

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