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International Journal of Photoenergy
Volume 2007 (2007), Article ID 97308, 7 pages
http://dx.doi.org/10.1155/2007/97308
Research Article

Photocatalytic Inactivation Effect of Gold-Doped TiO2 (Au/TiO2) Nanocomposites on Human Colon Carcinoma LoVo Cells

1Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
2Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, China
3Institute of Genetics School of Life Sciences, Fudan University, Shanghai 200433, China

Received 28 May 2007; Accepted 6 September 2007

Academic Editor: P. Robertson

Copyright © 2007 Juan Xu 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 photocatalytic inactivation effecting of gold-doped TiO2 (Au/TiO2) nanocomposites on human colon carcinoma LoVo cells was investigated for the first time. The Au/TiO2 samples containing different amounts of Au (1–4 wt%) were prepared by deposition-precipitation (DP) method. These synthesized Au/TiO2 nanocomposites were characterized by transmission electron microscopy (TEM) and inductively coupled plasma atomic emission spectroscopy. It was found that the photocatalytic inactivation effect of TiO2 nanoparticles on LoVo cancer cells could be greatly improved by the surface modification of Au nanoparticles. Furthermore, the loading amount of Au on the surface of TiO2 nanoparticles affects the photocatalytic inactivation efficiency strongly, and it was found that the most efficient nanocomposites were TiO2 nanoparticles doped with 2 wt% Au. When 50 μg/mL 2 wt% Au/TiO2 nanocomposites were used, all of the LoVo cancer cells were killed under the irradiation of UV light (λmax = 365 nm, Intensity = 1.8 mW/cm2) within 100 minutes. But for 50 μg/mL TiO2 nanoparticles, only 40% cancer cells were killed under the same condition.