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Influence of Heat Treatment on Microstructure of TiO2/SiO2 Nanocomposite


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Influence of Heat Treatment on Microstructure of TiO2/SiO2 Nanocomposite
YANG YiWANG Qi-weiWANG Lian-jun
School of Chemical Engineering,NUST,Nanjing 210094,China
heat treatment nanometer composites sol-gel method microstructures
To study the effect of heat treatment on the microstructure of nanometer composites,the nanometer TiO2/SiO2 composites with high special surface area and high pore volume are prepared by sol-gel method with ethyl orthosilicate and tetrabutyl titanate.DSC,TGA,XRD,FTIR and special surface area(BET) tester are employed to analyse the microstructure of the nanocomposite treated by different temperature.The result indicates that the crystal transformation temperature of anatase and rutile of nanometer TiO2 in the TiO2/SiO2 composite increases from 350℃ and 600℃up to 660℃ and 770℃,respectively.It is obviously higher than its general crystal transformation temperature.Its crystal diameter increases with the increase of heat treatment temperature and treatment time.With the increase of heat treatment temperature,the special surface area of nanometer TiO2/SiO2 composite decreases visibly.The reduction proportion of the little micropore in the nanocomposite decreases too,while that of the bigger micropore is increased.


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Last Update: 2012-11-19