Abstract
In this paper, Fe3O4/SiO2/Bi2MoO6 microspheres were prepared by a facile hydrothermal method. The scanning electron microscope (SEM) results revealed that flower-like three dimensional (3D) Bi2MoO6 microspheres were decorated with Fe3O4/SiO2 magnetic nanoparticles. The UV–vis diffuse reflection spectra showed extended absorption within the visible light range compared with pure Bi2MoO6. We evaluated the photocatalytic activities of Fe3O4/SiO2/Bi2MoO6 microspheres on the degradation of Rhodamine B (RhB) under visible light irradiation and found that the obtained composite exhibited higher photocatalytic activity than pure Bi2MoO6 and P25. Moreover, the Fe3O4/SiO2/Bi2MoO6 composite also displayed excellent stability and their photocatalytic activity decreased slightly after reusing 5cycles. Meanwhile, the composite could be easily separated by applying an external magnetic field. The trapping experiment results suggest that superoxide radical species O2− and hydroxyl radicals OH play a major role in Fe3O4/SiO2/Bi2MoO6 system under visible light irradiation. The combination of flower-like three dimensional (3D) Bi2MoO6 microspheres and Fe3O4/SiO2 magnetic nanospheres provides a useful strategy for designing multifunctional nanostructure materials with enhanced photocatalytic activities in the potential applications of water purification.
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