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分别以TiCl4,Ti(NO3)4和Ti(SO4)2为前驱体,在低温和强酸性条件下,通过水解反应可控地合成了具有不同晶相组成,且比表面积较高的纳米TiO2,并用XRD,TEM和N2-吸附脱附技术对其晶相、粒径大小、形貌及比表面积进行了表征。结果表明,钛离子在有Cl-、NO3-存在的酸性溶液中水解,水解温度≤80℃,可以生成结晶良好的具有细小晶粒尺寸和较高比表面积的金红石型纳米TiO2粉体,水解温度>80℃,反而有锐钛矿型TiO2生成,而在有SO42-存在的酸性溶液中,TiO2样品的晶相组成不随水解温度的变化而改变,均为锐钛矿型,其比表面积可达300m·2g-1。
TiCl4, Ti (NO3) 4 and Ti (SO4) 2 were used as precursors respectively to synthesize nano TiO2 with different crystal phase and high specific surface area under the conditions of low temperature and strong acid. The crystal phase, particle size, morphology and specific surface area were characterized by XRD, TEM and N2-adsorption-desorption. The results show that the titanium ions are hydrolyzed in the presence of Cl- and NO3-, and the hydrolysis temperature is less than or equal to 80 ℃, the rutile nano-TiO2 powder with fine crystallite size and high specific surface area can be obtained. The hydrolysis temperature > 80 ℃, but there is anatase TiO2 generation, and in acidic solution with SO42-, the crystalline phase composition of TiO2 sample does not change with the change of hydrolysis temperature, both anatase type, the specific surface area of up to 300m · 2g-1.