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Fe3O4/SiO2/Bi2WO6磁性复合光催化剂的制备及其光催化性能
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浙江大学材料科学与工程学院,浙江大学材料科学与工程学院;浙江加州国际纳米研究院,浙江大学材料科学与工程学院,浙江大学材料科学与工程学院,浙江大学材料科学与工程学院,浙江加州国际纳米研究院

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国家高技术研究发展计划(863计划)(项目号2015AA034701)


Preparation of magnetic composite photocatalyst Fe3O4/SiO2/Bi2WO6 and its photocatalytic activity
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Department of Materials Science and Engineering of Zhejiang University,Hangzhou PR China,Department of Materials Science and Engineering of Zhejiang University,Hangzhou PR China Zhejiang-California International NanoSystems Institute;China,Department of Materials Science and Engineering of Zhejiang University,Hangzhou,Department of Materials Science and Engineering of Zhejiang University,Hangzhou PR China,Department of Materials Science and Engineering of Zhejiang University,Hangzhou PR China Zhejiang-California International NanoSystems Institute

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    摘要:

    钨酸铋(Bi2WO6),结构最简单的Aurivillius相化合物,是近期受到研究者关注的新型光催化材料。然而,光催化剂粉末在反应介质中难被回收,工业化应用成本较高。本文用三步方法合成了可回收的Fe3O4/SiO2/Bi2WO6磁性复合光催化剂,通过溶剂热法合成具有磁性的Fe3O4,用溶胶凝胶法在Fe3O4表面覆盖SiO2层,后将磁性颗粒与Bi2WO6纳米片相结合。光催化剂的形貌结构及性能通过XRD、SEM、PL、UV-vis进行表征测试。结果表明,直径约500 nm的Fe3O4微球附着在边长约500 nm的Bi2WO6纳米片的表面,SiO2在两者之间起到了粘连作用。光催化剂Fe3O4/SiO2/Bi2WO6对于罗丹明B的光降解活性较好,且有一定磁性,可以通过外加磁场将其从溶液中分离,有较大的应用潜力。

    Abstract:

    Bismuth tungstate (Bi2WO6), one of the simplest Aurivillius phase oxides, has been used as a new photocatalyst that works under visible light irradiation. However, it is not easy to reuse the photocatalyst due to difficulty in its recovery from the reaction media. Indeed, reusability and recyclability of photocatalyst are major factors considered in industrial applications. In the paper, magnetically recoverable photocatalyst Fe3O4/SiO2/Bi2WO6 was synthesized by a three-step approach. After a hydrothermal process of preparing ferroferric oxide (Fe3O4), these Fe3O4 nanoparticles were coated with SiO2 by sol-gel method. Finally, Fe3O4/SiO2 nanoparticles were immobilized onto the surface of Bi2WO6 by a second hydrothermal process. The morphology, structure and properties of the composite were characterized by XRD, SEM, PL spectra and UV-vis absorption spectrum. The results show that the Bi2WO6 nanosheets structures with average diameters of 500nm are further decorated by Fe3O4 nanoparticles with an average diameter of 500nm. The photocatalytic activity of Fe3O4/SiO2/Bi2WO6 to degrade rhodamine B was close to that of pure Bi2WO6. The photocatalyst with appropriate superparamagnetism can be easily re-collected by applying an external magnetic field. It shows potential applications in pollutant degradation.

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巫华婷,丁新更,李文琪,任春溶,杨辉. Fe3O4/SiO2/Bi2WO6磁性复合光催化剂的制备及其光催化性能[J].稀有金属材料与工程,2018,47(S2):199~203.[Huating Wu, Xingeng Ding, Wenqi Li, Chunrong Ren, Hui Yang. Preparation of magnetic composite photocatalyst Fe3O4/SiO2/Bi2WO6 and its photocatalytic activity[J]. Rare Metal Materials and Engineering,2018,47(S2):199~203.]
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  • 收稿日期:2017-11-28
  • 最后修改日期:2017-11-28
  • 录用日期:2018-02-01
  • 在线发布日期: 2018-11-01
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