TiO<sub>2</sub>/MCM-41的制备及光催化脱色性能研究

窦琳; 李建章; 钟俊波; 王涛; 程朝柱; 陈久福; 李敏娇

doi:10.7513/j.issn.1004-7638.2015.02.005

TiO₂/MCM-41的制备及光催化脱色性能研究

doi: 10.7513/j.issn.1004-7638.2015.02.005

1. 绿色催化四川省高校重点实验室, 四川理工学院化学与制药工程学院, 四川自贡 643000;
2. 四川理工学院材料与化学工程学院, 四川自贡 643000

基金项目:

四川理工学院校级科研基金(No.2012KY11)；绿色催化四川省高校重点实验室开放课题(LYJ14203,LZJ1301)；四川理工学院研究生创新基金项目(Y2013025)；四川理工学院学科建设项目基金资助。

详细信息

作者简介:
窦琳(1987-),女,山西晋城人,助教,硕士,主要从事光催化研究;李建章(1965-),男,四川资中人,教授,博士,主要从事光催化研究,E-mail:lyl63@sina.com。

中图分类号: TF823,TQ426
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出版历程
- 收稿日期: 2014-12-18

Preparation and Photocatalytic Activities of TiO₂/MCM-41 Photocatalyst

1. Key Laboratory of Green Catalysis of Sichuan Institutes of Higher Education, School of Chemistry and Pharmaceutical Engineering, Zigong 643400, Sichuan, China;
2. College of Materials and Chemical Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan, China

摘要

摘要: 用溶胶-凝胶法制备了不同TiO₂含量的TiO₂/MCM-41光催化剂,以罗丹明B为模拟有机污染物,对催化剂的光催化脱色性能进行了考察。用XRD、UV-Vis漫反射、N₂吸附等方法对光催化剂进行了表征,结果表明:TiO₂/MCM-41的比表面积和孔体积随TiO₂含量的增加而减小,TiO₂/MCM-41负载型催化剂上TiO₂平均晶粒尺寸比纯TiO₂的小。20%TiO₂/MCM-41的光生电子-空穴分离效应最高,且光催化脱色活性最高。光催化反应体系中h+是主要的活性自由基,TiO₂/MCM-41的光催化活性由材料的吸附能力和所含TiO₂的光催化性能共同决定。
- TiO₂ /
- MCM-41 /
- 光催化脱色 /
- 自由基
Abstract: TiO₂/MCM-41 photocatalysts with different titania content were prepared by loading titania onto the mesopores of MCM-41 molecular sieves via a sol- gel method. The photocatalytic activities of TiO₂/MCM-41 photocatalysts were evaluated by the photocatalytic degradation of Rhodamine B aqueous solution.TiO₂/MCM-41 photocatalysts were characterized by X-ray diffraction （XRD）,UV- Vis diffuse reflectance spectroscopy and N₂ adsorption techniques. The results indicate that both the BET surface area and pore volume of TiO₂/MCM-41 photocatalyst decrease with the increase in content of loaded titania. The average crystal size of titania loaded on TiO₂/MCM-41 is smaller than that of pure titania nanoparticles. 20% TiO₂/MCM-41 photocatalyst has the highest photo- induced charge separation efficiency. Among all the photocatalysts,the 20% TiO₂/MCM-41 sample possesses the best photocatalytic activity. The h⁺ is main active species during the photocatalytic process. The photocatalytic activities of the TiO₂/MCM-41 photocatalyst depend on their adsorption abilities and the activity of titania loaded onto the MCM-41 molecular sieves.
- titania /
- MCM-41 /
- photocatalytic decolorization /
- radicals