摘要:
以钛酸四丁酯为钛源,通过溶胶—凝胶法合成了纳米TiO2光催化材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外—可见光光度计(UV-Vis)、比表面及孔径分析仪对样品的物相组成、显微结构及光催化性能进行分析测试。研究结果表明:低温煅烧下,纳米TiO2由单一的锐钛矿相组成,具有一定的团聚现象,尺寸约为20~60μm,随着温度的升高,尺寸变大。当煅烧温度达到600℃时,试样中出现金红石第二相,抑制晶粒长大尺寸约为6~12 nm。试样中产生4~6 nm的介孔孔道,比表面积为136.872 m2·g-1,对甲基橙的降解率达到92%。
Abstract:
Nano-TiO2 photocatalyst was prepared by sol-gel method with tetrabutyl titanate as the raw material.The phase composition,microstructure and photocatalytic properties of the obtained nano-TiO2 samples were characterized by XRD,SEM,UV-Vis,specific surface and aperture analyzer,respectively. The results show that the nano-TiO2 samples are composed of single anatase phase under low calcination temperatures,having a certain degree of agglomeration with size of about 20 ~60 μm. With increase of the temperature,the size of agglomerations increases.The rutile phase is formed in the samples when the calcination temperature reaches 600 ℃,with size of crystals about 6 ~12 nm which inhibite the grain growth of anatase phase.There is a large number of 4 ~6 nm mesoporous in the sample having a specific surface area of 136.872 m2·g-1.Degradation rate of methyl orange by the nano-TiO2 can reach above 92%.
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