Nanocrystalline titania was prepared by the homogeneous-precipitation method at temperature lower than 120℃.The properties of powders were identified by XRD, TEM and diffuse reflection spectra. The results showed that rutile titania formed at 70℃ without calcination in air. Nanometer rutile TiO2 had good crystalline and small particle size. The formation mechanism of rutile was also discussed. The photocatalytic activity of the prepared particles was tested for the degradation of methyl orange. The photocatalytic activity of rutile TiO2 was higher than those obtained from Degussa P-25 TiO2. The reasons for high photocatalytic activity of rutile were discussed.
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