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Sol-gel prepared InTaO4 and its photocatalytic characteristics

Published online by Cambridge University Press:  31 January 2011

Hsiang-Chen Chen ,
Hung-Chi Chou ,
Jeffrey C.S. Wu  and
Hsin-Yu Lin
Hsiang-Chen Chen
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617
Hung-Chi Chou
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617
Jeffrey C.S. Wu*
Affiliation:
Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan 10617
Hsin-Yu Lin
Affiliation:
Department of Materials Science and Engineering, National Dong Hwa University, Hualien, Taiwan 97401
*
a)Address all correspondence to this author. e-mail: cswu@ntu.edu.tw
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Abstract

InTaO4 is an efficient visible-light photocatalyst, which used to be synthesized by solid-state fusion at over 1100 °C. However, irregular morphology and severe agglomeration of particles were acquired due to nonuniform fusion of solid precursors. In this study, InTaO4 was synthesized by two sol-gel routes, the thermal hydrolysis and esterification methods. The precursors were indium (III) nitrate pentahydrate [In(NO3)3] and tantalum(V) butoxide [Ta(OC4H9)5] dissolved in solutions. The InTaO4 powders with a uniform grain size of 17.7 nm were successfully synthesized using the esterification method at a calcination temperature of 950 °C. A uniform InTaO4 thin film nearly 40 nm thick formed on an optical fiber at 1100 °C using the sol prepared by the esterification method. For the first time, InTaO4 was evaluated by the photocatalytic activity of CO2 photo reduction, which was conducted in aqueous solution under visible light irradiation. Cocatalyst NiO was loaded on the surface of InTaO4 to further enhance the methanol yield. The methanol yields of NiO/InTaO4 by esterification method were significantly higher than those by solid-state fusion. The esterification method provided homogeneous mixing of Ta(OC4H9)5 and In(NO3)3, resulting in nano-sized InTaO4 with uniform crystallinity and superior photocatalytic activity.

Keywords

Sol-gelPhotochemicalCatalytic
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1364 - 1370
Copyright
Copyright © Materials Research Society 2008

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References

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