文献类型：期刊文献

中文题名：扩散火焰法制备TiO_2纳米晶及其光催化活性

英文题名：Preparation of TiO_2 Nanocrystallite by co-Flow Diffusion Flames and Their Photocatalytic Activity

作者：刘秀红[1];赵尹[1];姜海波[1];干路平[1];李春忠[1]

机构：[1]华东理工大学超细材料制备与应用教育部重点实验室,上海200237

年份：2007

卷号：33

期号：2

起止页码：200

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：20072210628426);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：扩散火焰;气相水解;TiO2纳米晶;光催化

外文关键词：co-flow diffusion flames; gas hydrolysis; TiO2 nanocrystallite; photocatalyst

摘要：利用自行设计开发的扩散火焰燃烧反应器,以四氯化钛为前驱体,通过四氯化钛气相水解法,改变四氯化钛进料速率和中心环氧气含量,合成粒径和晶型组成可控的二氧化钛纳米晶。透射电镜(TEM)和X射线衍射仪(XRD)分析结果表明:制备的球形样品分散性好、粒径分布均匀、晶化完整。以罗丹明B染料在紫外光条件下的降解为模型反应,考察了球形二氧化钛纳米晶的粒径和晶型组成与光催化活性的关系。结果表明:晶型组成不变时,晶粒尺寸越小,光催化活性越好;而当晶粒尺寸不变时,随着锐钛矿型质量分数的增加,光催化降解罗丹明B的活性先增加后降低,锐钛矿型二氧化钛质量分数为0.80时,光催化活性最好。
TiO2 nanocrystallite was synthesized by gas hydrolysis of titanium tetrachloride conducted in co-flow diffusion flames. TIC14 feed rate and O2 mole fraction in the center tube were varied to tune the grain size and the anatase content of TiO2 nanocrystallite. Transmission electron microscopy （TEM） and X-ray powder diffraction （XRD） results show that the nanocrystallite is spherical in shape, uniformly distributed within the narrow size range. The photocatalyst activity of TiO2 nanocrystallites under UV irradiation is evaluated using RhB as a mode organic compound. The results indicate that when the anatase content of TiO2 nanocrystallite is constant, the grain size is in the range of 9.4 nm to 15.5 nm, smaller size has higher photocatalytic activity; when the grain size is constant, with the increasing of the anatase content, the photocatalytic activity increases first and then decreases. The anatase content of 0. 80 has the highest photocatalytic activity for RhB degradation.