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本文报道了一种由TiOCl2 液相直接合成金红石型TiO2 纳米粒子的新方法 ,即微波诱导沸腾回流强迫水解法 ,用该法制备出常规条件下不能得到的产品。所得产物用粉末X射线衍射仪和透射电子显微镜表征 ,证明产物为金红石型 ,粒子尺寸 5～ 30nm可控。研究表明 ,产物物相取决于Ti4+ 的初始水解速率 ,水解速率越快 ,越有利于金红石相成核 ;通过控制初始Ti4+ 的浓度 ,可改变纳米TiO2 的粒径。另外还讨论了该金红石型TiO2 纳米粒子的成核机理。
In this paper, a new method for the direct synthesis of rutile TiO2 nanoparticles from the liquid phase of TiOCl2 was reported. The microwave-induced boiling reflux forced hydrolysis method was used to prepare the products which can not be obtained under the normal conditions. The obtained product was characterized by powder X-ray diffractometry and transmission electron microscopy, which proved that the product was rutile and the particle size was 5 ~ 30nm. The results show that the phase of the product depends on the initial hydrolysis rate of Ti4 +. The faster the hydrolysis rate, the more favorable the rutile phase nucleation. By controlling the initial concentration of Ti4 +, the particle size of TiO2 can be changed. In addition, the nucleation mechanism of the rutile TiO2 nanoparticles is also discussed.