采用一次微波辅助促进水解, 水浴陈化或二次微波辐射促进晶化的热处理方法, 在较低温度下制得纳米TiO2晶体颗粒, 样品表征结果证明为单一锐钛矿晶型, 且具有球形或短柱型形貌特征. 晶体生长宏观动力学研究显示, 二次微波辐射下纳米TiO2晶体生长规律可描述为2次方程, 表观生长活化能为59.47 kJ/mol, 而水浴陈化方式下晶体生长则可描述为3次方方程, 表观生长活化能为19.44 kJ/mol, 因此二次微波辐射方法制备纳米TiO2晶体具有更大的表观生长活化能和独特的动力学性质.
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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