磁功能性TiO2光催化剂的制备及特性

doi:10.7517/j.issn.1674-0475.2013.03.008

影像科学与光化学 ›› 2013, Vol. 31 ›› Issue (3): 229-237.DOI: 10.7517/j.issn.1674-0475.2013.03.008

• 应用与发展 • 上一篇

磁功能性TiO₂光催化剂的制备及特性

费学宁¹, 刘星星¹, 李金蕊², 姜远光¹

1. 天津城市建设学院, 天津 300384;
2. 许昌一方建筑设计有限公司, 河南许昌 461000

收稿日期:2013-01-23 修回日期:2013-04-04 出版日期:2013-05-15 发布日期:2013-05-15
通讯作者: 费学宁(1957-),教授,电话:022-23773042,E-mail:xueningfei@126.com.

Preparation and Characteristics of Magnetic TiO₂ Photocatalysts

FEI Xue-ning¹, LIU Xing-xing¹, LI Jin-rui², JIANG Yuan-guang¹

1. Tianjin Institute of Urban Construction, Tianjin 300384, P.R.China;
2. Xuchang Party Architectural Design Co. Ltd, Xuchang 461000, Henan, P.R.China

Received:2013-01-23 Revised:2013-04-04 Online:2013-05-15 Published:2013-05-15

摘要/Abstract

摘要： 采用溶胶-凝胶法以Fe₃O₄为磁核制备了磁功能性光催化剂,以甲基橙为模拟污染物,考察了掺杂Fe比例、催化剂煅烧温度以及煅烧时间对催化剂活性的影响.催化剂的最佳制备条件为:Fe₃O₄掺杂Fe含量为5%,煅烧温度为450 ℃,煅烧时间为2 h.通过TG-DTA、XRD、UV-Vis、TEM对催化剂进行了表征,结果表明:制备的催化剂具有明显的核壳结构,原Fe₃O₄磁核经过高温煅烧被氧化;TiO₂包覆在磁核表面;催化剂的吸收带边发生红移,在可见光区的吸收强度有所增强;催化剂颗粒的平均粒径为20 nm.

关键词: 溶胶-凝胶法, 磁性催化剂, 光催化活性

Abstract: A magnetic TiO₂ photocatalyst of Fe₃O₄ magnetic core was prepared with a sol-gel method, and its photocatalytic activity was evaluated by the photo degradation of methyl orange aquous solution. The effects of Fe doping amount, calcination temperature and calcination time on the photocatalytic activity were investigated. The results showed that the optimal preparation conditions were of 5% Fe doping amount, 450 ℃ calcination temperature and 2 h calcination time. The prepared catalyst was characterized by thermo-gravimetric differential thermal analysis (TG-DTA), X-ray diffraction (XRD), ultraviolet-visible spectroscopy (UV-Vis) and transmission electron microscope (TEM), and the results showed that prepared catalyst had a core-shell structure with the coating of TiO₂ on the surface of magnetic core. The original magnetic Fe₃O₄ core was oxidized by high temperature calcination .There was a red shift in the absorption band edge of prepared catalyst, its absorption intensity in the visible light region increased slightly, and the average particle size of prepared catalyst was 20 nm.

Key words: sol-gel method, magnetic catalyst, photocatalytic activity

中图分类号:

费学宁, 刘星星, 李金蕊, 姜远光. 磁功能性TiO₂光催化剂的制备及特性[J]. 影像科学与光化学, 2013, 31(3): 229-237.

FEI Xue-ning, LIU Xing-xing, LI Jin-rui, JIANG Yuan-guang. Preparation and Characteristics of Magnetic TiO₂ Photocatalysts[J]. Imaging Science and Photochemistry, 2013, 31(3): 229-237.

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磁功能性TiO₂光催化剂的制备及特性

Preparation and Characteristics of Magnetic TiO₂ Photocatalysts

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