锐钛矿型纳米TiO_2溶胶的性能研究  

Study on properties of anatase nano-TiO_2 sol

作　　者：纳薇[1] 朱忠其[1] 张谨[1] 杨鑫[1] 段志刚[1] 柳清菊[1] 

机构地区：[1]云南大学材料科学与工程系,云南昆明650091

出　　处：《功能材料》2006年第11期1822-1824,共3页Journal of Functional Materials

基　　金：国家自然科学基金(50162002)教育部新世纪优秀人才支持计划资助项目(NCET-04-0915)云南省自然科学基金(2005ED007M)

摘　　要：采用溶胶法,以水为溶剂,在60℃下合成了TiO_2溶胶。采用X射线衍射、差热分析、Zeta电位分析对其性能进行了表征,结果表明,所合成溶胶中的TiO_2为纯锐钛矿型,平均粒径分布为2．3nm．Zeta电位为34mV。对甲基橙的降解实验表明,催化剂用量为5ml时,溶胶对甲基橙的降解率最高；在紫外光下,与P25粉体相比,溶胶降解速率更快,20min后对甲基橙的降解率即可达到93%。在可见光及荧光灯下溶胶也具有较好的降解效率。Anatase nano-TiO2 sols were directly prepared at 60℃ by sol method with distilled water as solvent. The sol and the dried powder have been investigated by means of XRD, DSC-TGA and zeta potential analyses. The results show that the crystal structure of TiO2 in the sol is anatase, and the particle average size is 2.3nm, and the Zeta potential of the sol is 34inV. The degradation of methyl orange demonstrates that the optimum catalyst dosage is 5ml. The degradation rate of methyl orange is 93% after 20min under UV light, but that degradation by P25 is just 37.4 %. The sol also demonstrates higher photocatalytic activity under sunlight and fluorescent light.

关 键 词：TIO2溶胶 锐钛矿 甲基橙 

分 类 号：O643[理学—物理化学] O648[理学—化学]