Effect of calcination temperature on the photocatalytic activity of porous TiO2 film

To obtain porous TiO(2) film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO(2) film was fabricated by dip-coating method on quartz glass substrates using this sol. The TiO(2) films were calcined at 500-900 degrees C. The photocatalytic activities of the films were evaluated by examining decomposition of methylene blue in aqueous solution under UV light irradiation. The photocatalytic activity of the porous TiO(2) film showed a different tendency according to the irradiation wavelength of UV light. The activity of the film evaluated under UV light irradiation with a wavelength of 254 nm was not affected a great deal by the clacination temperature. In the case of UV light irradiation with a wavelength of 365 nm, the activity of the film increased with increasing calcination temperature and that of the film calcined at 800 degrees C was the highest.