Bactericidal and photocatalytic activity of Fe³⁺-TiO₂ thin films prepared by the sol-gel method

Abstract

Pure TiO₂ thin films and iron doped TiO₂ thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer (XRD), thermo-gravimetric analysis (TG-DSC), high resolution transmission electron microscope (HRTEM), scanning electron microscope (SEM) and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO₂ thin films and iron doped TiO₂ thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO₂ thin film is a better photocatalyst than pure TiO₂ thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO₂ photocatalyst.

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