Effects of Gelatin on Phase Transformation and Photocatalytic Activity of Nano-size Titanium Dioxide

doi:10.7517/j.issn.1674-0475.2006.02.93

Abstract

Abstract: Nanocrystalline TiO₂ powders were prepared with gelatin dispersants by sol-gel method.The effects of gelatin on phase transformation and average particle sizes of nanocrystalline TiO₂ during calcination were investigated by the means of XRD,TG-DTA,AFM,and N₂ 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 TiO₂ 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.)

Key words: gelatin, titanium dioxide, phase transformation, average particle size, photocatalytic activity

CLC Number:

O643

TIAN Bao-zhu, TONG Tian-zhong, CHEN Feng, ZHANG Jin-long. Effects of Gelatin on Phase Transformation and Photocatalytic Activity of Nano-size Titanium Dioxide[J]. Imaging Science and Photochemistry, 2006, 24(2): 93-101.

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