Preparation of magnetic Fe 3 O 4 /SiO 2 /Bi 2 WO 6 microspheres and their application in photocatalysis

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Materials Research Bulletin, ISSN: 0025-5408, Vol: 48, Issue: 2, Page: 725-729

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Chen, Su-Hua, Yin, Zhen, Luo, Sheng-Lian, Au, Chak-Tong, Li, Xue-Jun
Elsevier BV, Elsevier
Materials Science, Physics and Astronomy, Engineering, A. Magnetic materials, B. Chemical synthesis, C. Electron diffraction, C. X-ray diffraction, D. Catalytic properties
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Magnetic Fe 3 O 4 /SiO 2 /Bi 2 WO 6 microspheres with photocatalytic properties have been synthesized using a silica layer for “bonding” (adhering Bi 2 WO 6 to Fe 3 O 4 ). The morphology, composition and magnetic properties of the Fe 3 O 4 /SiO 2 /Bi 2 WO 6 composites were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, vibrating sample magnetometry, and BET surface area analysis. The activity of the material in photocatalytic decoloration of aqueous rhodamine B (RhB) solution under visible light was evaluated. The results showed that Bi 2 WO 6 combined well with the magnetic Fe 3 O 4 /SiO 2 nanoparticles. The Fe 3 O 4 /SiO 2 /Bi 2 WO 6 composites were spherical in shape, having a mean size of 2 μm. The spent catalyst could be recycled with only slight decline in catalytic activity. It is envisaged that the stability, reusability, and magnetic nature of the Fe 3 O 4 /SiO 2 /Bi 2 WO 6 catalyst warrants its application in photocatalysis.

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