摘要
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。
Nanometer titanias in different crystal structures with high specific surface area have been prepared at low temperature by the hydrolysis of titanium（Ⅳ） chloride （TiCl4）, titanium（Ⅳ） nitrate （Ti（NO3）4） or titanium（Ⅳ） sul- fate （Ti（SO4）2） precursor under highly acidic condition. The phase composition, morphology and the specific surface area of nanometer titania powders were characterized by means of XRD, TEM and N2-adsorption measurements. It is found that, titania in pure rutile phase or anatase-rutile mixed phase or pure anatase phase could be synthesized at low temperature in liquid media through controlling the hydrolyzation conditions. The well-crystallized rutile TiO2 with small particle size and high specific surface （above 200 m^2·g^-1） was formed at temperature equal to or below 80 ℃, while the anatase TiO2 was formed at higher temperature in hydrochloric or nitric acid solution. But in sulfuric acid solution the crystal phase was always anatase at any temperatures and the BET surface area of the as-prepared anatase titania was all more than 300 m^2·g^-1.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2006年第7期1196-1202,共7页
Chinese Journal of Inorganic Chemistry
关键词
纳米TIO2
晶型控制合成
比表面积
nanometer TiO2
crystal structure controlled synthesis
specific surface area
