Preparation and Photocatalytic Properties of Magnetically Separable Photocatalyst Nanospheres with Egg-like Structure

doi:10.3969/j.issn.0251-0790.2012.07.027

Abstract

Abstract: A novel magnetically separable photocatalyst nanosphere TiO₂@SiO₂@NiFe₂O₄(TSN) with egg-like structure was prepared by reverse micelles method and electrostatic self-assembly method. The photocatalyst shows high photocatalytic activity for the degradation of methyl orange in water. The magnetic property measurements indicate that the photocatalyst possesses a superparamagnetic nature, which can be separated and recycled conveniently through an external magnetic field. X-ray diffractometer(XRD) and transmission electron microscope(TEM) were used to characterize the structure of the TSN photocatalyst nanosphere. The results indicate that nickel ferrite core nanoparticles are completely encapsulated into silica nanospheres as carrier, and titania nanoparticles are assembled onto the surface of SN nanospheres, forming a TiO₂ shell for photocatalysis. The SiO₂ layer between the NiFe₂O₄ core and the TiO₂ shell effectively prevents the injection of charges from TiO₂ particles to NiFe₂O₄, which gives rise to an increase in photocatalytic activity.

Key words: Photocatalyst nanospheres, Magnetically separable, Egg-like structure, TiO₂

CLC Number:

O643

TrendMD:

XU Shi-Hong, ZHAO Song-Jian, TAN Dong-Dong, SHI Peng-Hui, BI De-Fu. Preparation and Photocatalytic Properties of Magnetically Separable Photocatalyst Nanospheres with Egg-like Structure[J]. Chem. J. Chinese Universities, 2012, 33(07): 1511.

References

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