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pp.889-896
The nanosized TiO2 photocatalysts were prepared by the hydrolysis of TiCl4 and calcined at different temperatures. The resulting materials were characterized by TGA, DSC, XRD, and TEM testing techniques. XRD, TEM, and BET measurements indicated that the particle size of TiO2 was increased with rise of calcination temperature and surface area was decreased with rise of it. The prepared TiO2 photocatalysts were used for the photocatalytic degradation of congo red. The effects of calcination temperature, TiO2 loading, the initial concentration of congo red, and usage frequencies were investigated and the rate constants were determined by regressing the experimental data. Calcination is an effective treatment to increase the photoactivity of nanosized TiO2 photocatalysts resulting from the improvement of crystallinity. The optimum calcination temperature of the catalyst for the efficient degradation of congo red was found to be 400℃. The rate constant was decreased with increase in the initial concentration of congo red and increased with increase in the TiO2 loading. In the case of TiO2 photocatalysts, the photocatalytic activity wasn't greatly affected by the usage frequencies.
