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International Journal of Photoenergy
Volume 2012 (2012), Article ID 536194, 8 pages
http://dx.doi.org/10.1155/2012/536194
Research Article

Preparation and Characterization of ( I 𝟐 ) 𝑛 Sensitized Nanoporous T i O 𝟐 with Enhanced Photocatalytic Activity under Visible-Light Irradiation

1School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
2State key labs of Crystal Materials, Shandong University, Jinan 250100, China

Received 18 December 2011; Accepted 31 January 2012

Academic Editor: Xuxu Wang

Copyright Β© 2012 Juzheng Zhang 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

A yellow/brown powder of ( I 𝟐 ) 𝑛 sensitized nanoporous TiO2 was obtained via an hydrolysis with TiCl4 and iodine hydrosol as raw material. I2 nanoparticles in the hydrosol were used as seeds to initiate the nucleation of a precursory TiO2 shell. The hybridized jumbles were further calcinated at different temperatures. The structure, crystallinity, morphology, and other physical-chemical properties of the samples are characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms measurements, and UV-vis diffuse reflectance spectroscopy (DRS). The formation mechanism of these ( I 𝟐 ) 𝑛 sensitized nanoporous TiO2 is discussed. Methylene blue solutions were used as model wastewater to evaluate the visible light photocatalytic activity of the samples. The results indicate that iodine can exist even in high-temperature calcination for iodine being encapsulated in the nanocavities inside TiO2. The degradation of methylene blue (MB) accorded with the first-order reaction model.