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Journal of Nanomaterials
Volume 2013 (2013), Article ID 627385, 11 pages
http://dx.doi.org/10.1155/2013/627385
Research Article

Solvothermal Synthesis of TiO2 Photocatalysts in Ketone Solvents with Low Boiling Points

1Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, 415 Chien-Kung Road, Kaohsiung 807, Taiwan
2Department of Chemical and Biotechnology Engineering, University of Colorado at Boulder, Boulder, CO 80309, USA
3Department of Chemical Engineering, Da Nang University of Technology, Da Nang, Vietnam

Received 4 February 2013; Revised 13 April 2013; Accepted 18 April 2013

Academic Editor: Yanbao Zhao

Copyright © 2013 Chau Thanh Nam et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The titanium dioxide (TiO2) photocatalysts were synthesized by a solvothermal process in highly alkaline 70 : 30 water : ketone solutions with a TiO2-P25 precursor and calcined at different temperatures. The ketone solvents, such as acetone and methyl ethyl ketone (MEK), had low boiling points (<100°C). The as-prepared samples were characterized by XRD, TEM, FTIR, UV-vis and Raman spectroscopy. The effects of the different solvents on the nanostructure, the morphology, and the photocatalytic performance of the TiO2 products were investigated. Nanotubes formed in water and water-MEK, while nanoparticle/nanowires formed in water-acetone and water-acetone-MEK. The ketone solvents played an important role in the improving nanostructure properties of these products, which affected their photocatalytic reactions. The results indicated that samples synthesized in solvents such as water and MEK had high adsorption and photocatalytic behaviors. The photocatalytic reactivity was the greatest for the TiO2 prepared in MEK and calcined at 100°C, which was even more reactive than the sample prepared in water and TiO2-P25 powder.