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Study on the Crystal Growth Kinetics of Nano TiO2 Prepared with Microwave Aid at Low Temperature

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Author(s): FENG Wei, ZOU Ke-Hua, ZHAI Zen-Xiu

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 815;
Date: 2010;
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Keywords: microwave; TiO2 nanocrystal; crystal growth; study of kinetics

ABSTRACT
The TiO2 nanocrystal particles were prepared by low-temperature method. Firstly, hydrolysis of reactants was promoted with microwave radiation aid, then crystallization could be facilitated through the process of the second microwave radiation or aging in water bath. The characterization results show that the shape of TiO2 nanocrystal is sphere or short column, which are all in pure anatase phase. The kinetic studies indicate that the anatase TiO2 growth can be described as the twice order kinetic equation and the apparent activity energy is 59.47 kJ/mol with two-step microwave radiation, while the kinetic equation is conformed to the third order and the apparent activity energy is 19.44 kJ/mol with ageing process. The above comparison proves that the nanocrystal TiO2 would grow faster in short time with the two-step microwave radiation at low temperature.
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Tango Jona
Tangokurs Rapperswil-Jona