摘要：

Nanocrystalline TiO_2 powders were prepared with gelatin dispersants by sol-gel method.The effects of gelatin on phase transformation and average particle sizes of nanocrystalline TiO_2 during calcination were investigated by the means of XRD,TG-DTA,AFM,and N_2 adsorption-desorption.Moreover,the effects of gelatin dosage on photocatalytic activity of samples were evaluated from an analysis of the photodegradation of methyl orange.The experimental results indicate that the gelatin has effects of inhibiting phase transformation from amorphism to anatase and decreasing the anatase-to-rutile transformation temperature,and the average particle size of nanocrystalline TiO_2 decreases with increasing the gelatin dosage.The photocatalytic activity of samples calcined at 600 ℃ increases with increasing gelatin dosage.As for samples calcined at 800 ℃,the highest photocatalytic activity was obtained when m_G:m_(TBOT)(mass ratio of gelatin to tetrabutyl titanate)=(1∶8.)

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