以四氯化钛为反应前驱体, 用低温水热法制备纯金红石相纳米TiO2, 研究了反应温度和反应时间对TiO2微结构和形貌的影响。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----11.5 nm。 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, 反应温度为60--80℃的TiO2样品呈梭形, 且彼此聚集呈束状, 但反应温度高于120℃时呈粒状, 且粒径增加。随着反应时间(4--40 h)的延长, TiO2呈棒状、梭状及颗粒状。
The pure rutile phase nano–TiO2 was prepared by low temperature hydrothermal method using titanium tetrachloride as reaction precursors. The effects of reaction temperature and reaction time on the microstructure and the morphology of the TiO2 samples were investigated. The X–ray diffraction patterns showed that all of the TiO2 samples were pure rutile phase. The average crystallite size was found to vary in the range of 4.0–11.5 nm. Fourier transform infrared spectra and thermogravimetry analysis showed that the nano–TiO2 samples have surface hydroxyl group and surface adsorbed water. Transmission electron microscopy analysis showed that the morphology and average size of the synthesized rutile nano– TiO2 were strongly effected by both hydrothermal reaction temperature and time. The rutile nano–TiO2 shows a similar shuttle–like morphology and were bunched together at the reaction temperature of 60–80 , however, at the reaction temperature above 120 they tended to resolve into spherical particles andattained larger sizes. The morphology of the rutile nano–TiO2 samples changed form rod–like to shuttle– like and spherical–like with increase of reaction time from 4 h to 40 h.
参考文献
| [1] | |
| [2] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%