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以硅藻土为载体,采用水解沉淀法制备了纳米TiO2/硅藻土复合粉体,利用X射线粉末衍射和透射电镜对样品进行了表征和计算分析,并对负载在硅藻土载体上的TiO2晶型转变和晶粒生长规律进行了探讨。结果表明:硅藻土载体对TiO2/硅藻土复合粉体中的TiO2晶型转变和晶粒生长都有一定的阻碍作用,TiO2粉体的晶型转变温度为750℃左右,复合粉体中TiO2晶型转变温度为900℃左右;随温度的升高,TiO2粉体的晶粒生长速度比复合粉体中TiO2晶粒快;TiO2粉体的锐钛矿和金红石晶粒生长的表观活化能分别为18.04kJ/mol和53.96kJ/mol,复合粉体中TiO2的分别为20.04kJ/mol和117.89kJ/mol。
Abstract：With diatomite as carrier, nanometer TiO2/diatomite composite powder was prepared by means of hydrolyzation/deposition. The obtained composite powder was characterized by X-ray powder diffraction and transmission electron microscope, and the rules of phase transformation and crystallite growth of TiO2 coated on the diatomite particles were studied. The results show that the diatomite carrier retards the phase transformation and the crystallite growth of TiO2 coated on the diatomite particles. The temperature of crys-talline phase transformation for TiO2 powder is about 750 ℃, and the temperature of crystalline phase transformation of TiO2 in the composite powder is about 900 ℃ . Compared with the composite powder, the speed of crystallite growth for TiO2 powder becomes faster with the increase of treatment temperature. The activation energy E (anatase) and E (rutile) are 18.04 and 53.96 kJ/mol respec-tively for the TiO2 powder, while they are 20.04 and 117.89 kJ/mol respectively for TiO2 in the composite powder.
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基本信息:
中图分类号:TB383.1
引用信息:
[1]王利剑,郑水林,田文杰.载体对TiO_2/硅藻土中TiO_2相变及晶粒生长的影响[J].硅酸盐学报,2008,No.235(11):1644-1648.
基金信息:
河南省教育厅自然科学研究计划项目(2008B43001);; 洛阳理工学院博士科研启动基金项目(2007R102);; 吉林省科技创新基金(2004107)资助项目
2008-11-15
2008-11-15