摘要
以四氯化钛和盐酸为反应介质，利用低温水热法制备纯金红石相纳米TiO2，考察了反应温度和反应时间对TiO2微结构及形貌的影响。X射线衍射分析表明所有产物均为纯金红石型纳米TiO2，晶粒尺寸范围4．0-11．5nm。红外光谱和热重分析表明产物TiO2存在表面羟基和表面水。TEM分析表明，TiO2形貌和粒径随反应温度或反应时间变化，反应温度60～80℃时样品呈梭形，且彼此聚集呈柬状，但120℃以上时呈粒状，且粒径增加。随反应时间（4～40h）延长，TiO2呈棒状、梭状及球状变化。此外，还对强酸性及低温水热条件下金红石型纳米TiO2的形成及形貌变化机理作了初步分析。
The pure rutile phase nano crystalline TiO2 particles were prepared by low temperature hydrothermal method using titanium tetrachloride and HCl as reaction media. The effects of reaction temperature and reaction time on the microstructure and the morphology of the TiO2 particles were investigated. The X-ray diffraction patterns show that all of the TiO2 samples were pure rutile phase. The average grain size is in the range of 4.0 - 11.5 nm. Fourier transform infrared spectra and thermogravimetry analysis show that the nano crystalline TiO2 particles have surface hydroxyl group and surface adsorbed water. Transmission electron microscopy analysis show that the morphology and average particle size of the synthesized rutile nano crystalline TiO2 particles are strongly effeeted by both hydrothermal reaction temperature and time. The rutile nano crystalline TiO2 particles appear shuttle-like shape and are bunched together at the reaction temperature of 60 -80℃ , however, with temperature increasing to above 120℃ they tend to resolve into spherical particles and increase size. The morphology of the rutite nano crystalline TiOz particles change from rod-like to shuttle-like and spherical particles with increase of reaction time from 4h to 40h. The mechanisms of the formation and the morphological transformations of futile nano crystalline TiO2 particles in the strong acid and low-temperature hydrothermal conditions were also analyzed.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2009年第6期403-407,413,共6页
Powder Metallurgy Technology
基金
江西省教育厅科技项目(GJJ08302)
东华理工大学校长基金项目(DHXK0919)
关键词
金红石型TIO2
低温水热法
形貌
反应温度
反应时间
rutile TiO2
low temperature hydrothermal method
shape
reaction temperature
reaction time
