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

doi:10.3724/SP.J.1077.2010.00815

Abstract

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 TiO₂growth 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.

Key words: microwave, TiO₂nanocrystal, crystal growth, study of kinetics

CLC Number:

O781

FENG Wei, ZOU Ke-Hua, ZHAI Zen-Xiu. Study on the Crystal Growth Kinetics of Nano TiO₂ Prepared with Microwave Aid at Low Temperature[J]. Journal of Inorganic Materials, 2010, 25(8): 815-819.

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

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