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International Journal of Photoenergy
Volume 2012, Article ID 265760, 9 pages
http://dx.doi.org/10.1155/2012/265760
Research Article

Enhanced Photocatalytic Activity of Powders (P25) via Calcination Treatment

1College of Chemistry and Environmental Engineering, Hubei Normal University, Huangshi, Hubei 435002, China
2State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, China

Received 14 September 2011; Revised 7 November 2011; Accepted 8 November 2011

Academic Editor: Jiaguo Yu

Copyright © 2012 Guohong Wang 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

P25 TiO2 powders were calcined at different temperatures in a muffle furnace in air. The P25 powders before and after calcination treatment were characterized with XRD FTIR, UV-visible diffuse reflectance spectra, SEM, TEM, HRTEM, and N2 adsorption-desorption measurements. The photocatalytic activity was evaluated by the photocatalytic oxidation of methyl orange aqueous solution under UV light irradiation in air. The results showed that calcination treatment obviously influenced the microstructures and photocatalytic activity of the P25 TiO2 powders. The synergistic effect of the phase structure, BET surface area, and crystallinity on the photocatalytic of TiO2 powders (P25) after calcination was investigated. An optimal calcination temperature ( ) was determined. The photocatalytic activity of TiO2 powders calcined at was nearly 2 times higher than that of the uncalcined P25 TiO2. The highest photocatalytic activities of the calcined samples at for 4 h might be ascribed to the enhancement of anatase crystallization and the optimal mass ratio (ca. 1 : 2) of rutile to anatase.