金红石型TiO2/ZnTiO3复合材料的制备及其光催化性能  

Preparation and Photocatalytic Activity of Rutile-TiO2/ZnTiO3 Composite

作　　者：朱晓东 王娟 罗宇浩 代华龙 喻强 冯威 ZHU Xiao-dong;WANG Juan;LUO Yu-hao;DAI Hua-long;YU Qiang;FENG Wei(College of Mechanical Engineering, Chengdu University, Chengdu 610106, China;Sichuan Xinya Non-destructive Testing Co. Ltd., Chengdu 610213, China)

机构地区：[1]成都大学机械工程学院,四川成都610106 [2]四川新亚无损检测有限公司,四川成都610213

出　　处：《发光学报》2020年第8期964-970,共7页Chinese Journal of Luminescence

基　　金：四川省科技厅应用基础研究项目(19YJ0664);成都大学大学生创新计划项目(CDU-CX-2020028,CDU-CX-2020034)资助。

摘　　要：采用溶胶-凝胶法制备了金红石型TiO2/ZnTiO3复合光催化剂,对其进行650℃保温1 h的热处理;通过X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、荧光光谱(PL)对样品进行表征,并以亚甲基蓝(MB)溶液为目标污染物,研究了样品的光催化性能。结果表明,TiO2为金红石结构,随着Zn/Ti量比增加,TiO2晶粒尺寸减小;当Zn/Ti的量比达到2%时,有新相ZnTiO3生成。TiO2/ZnTiO3(Zn/Ti=8%)展现出最高的光催化活性,这归因于表面羟基含量增加以及形成的TiO2/ZnTiO3半导体复合结构加快了光生电子与空穴的转移。反应进行90 min后,对MB的降解率达到68.3%,反应速率常数k为0.012 min-1,分别为纯TiO2的1.85倍和3倍。The rutile-TiO2/ZnTiO3 composite photocatalysts were synthesized by a sol-gel method,and were heat treated at 650℃for 1 h.The obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS)and photoluminescence spectra(PL).The photocatalytic performance of samples was studied taking the degradation of methylene blue(MB)as the target reactant.The results show that the crystal structure of TiO2 is rutile phase and the grain size of TiO2 decreases with the increasing Zn/Ti molar ratio.ZnTiO3 forms when the Zn/Ti molar ratio reaches 2%.TiO2/ZnTiO3(Zn/Ti=8%)exhibits the highest photocatalytic activity,which can be attributed to the increase of surface hydroxyl content and the formation of TiO2/ZnTiO3 semiconductor composite structure,accelerating the transfer of photogenerated electrons and holes.After 90 minutes of reaction,the degradation rate of MB by TiO2/ZnTiO3(Zn/Ti=8%)reaches 68.3%and the reaction rate constant k is 0.012 min-1,which are 1.85 times and 3 times higher than that of pure TiO2.

关 键 词：金红石 ZnTiO3 光催化性能 溶胶凝胶法 

分 类 号：TB332[一般工业技术—材料科学与工程]