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Liu Ping, Lin Huaxiang, Fu Xianzhi (Research Institute of Photocatalysis, Fuzhou University, Fuzhou 350002) Meng Chun (Department of Bioengineering, Fuzhou University, Fuzhou 350002)  
The doped TiO 2 film was prepared by sol gel method. The effects of preparation conditions on the sol stability were investigated and the bactericidal mechanism of the film material was analyzed on basis of TiO 2 photocatalyzed reactions. The results showed that both the forming rate and the particle size distribution of the sol were very sensitive to the peptizing temperature. At 40℃ the sol was stable, and making period was short. The bactericidal essence of TiO 2 film was that the free radical OH·and O - 2· produced by irradiation directly attacked the cell of bacteria, and caused the protein denatured or decomposed, leading to the bacteria to be killed and broken down. The efficiency for killing bacteria was correlative with the crystal phase composition of the TiO 2 film, and the efficiency was increased with increasing the anatase content in the film.
【Fund】: 国家产业化前期关键技术开发项目;国家自然科学基金;福建省自然科学基金
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