Large scale synthesis of FeS coated Fe nanoparticles as reusable magnetic photocatalysts

doi:10.1007/s11706-013-0213-9

Front Mater Sci

2013, Vol. 7

Issue (3) : 308-311 https://doi.org/10.1007/s11706-013-0213-9

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Large scale synthesis of FeS coated Fe nanoparticles as reusable magnetic photocatalysts

He FENG, Ping-Zhan SI(

), Xiao-Fei XIAO, Chen-Hao JIN, Sen-Jiang YU, Zheng-Fa LI, Hong-Liang GE

Zhejiang Key Lab of Magnetic Materials, China Jiliang University, Hangzhou 310018, China

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Abstract

The FeS coated Fe nanoparticles were prepared by using high temperature reactions between the commercial Fe nanoparticles and the S powders in a sealed quartz tube. The simple method developed in this work is effective for large scale synthesis of FeS/Fe nanoparticles with tunable shell/core structures, which can be obtained by controlling the atomic ratio of Fe to S. The structural, magnetic and photocatalytic properties of the nanoparticles were investigated systematically. The good photocatalytic performance originating from the FeS shell in degradation of methylene blue under visible light and the high saturation magnetization originating from the ferromagnetic Fe core make the FeS/Fe nanoparticles a good photocatalyst that can be collected and recycled easily with a magnet. An exchange bias up to 11 mT induced in Fe by FeS was observed in the Fe/FeS nanoparticles with ferro/antiferromagnetic interfaces. The enhanced coercivi-ty up to 32 mT was ascribed to the size effect of Fe core.

Keywords magnetic photocatalyst exchange bias FeS coated Fe nanoparticle

Corresponding Author(s): SI Ping-Zhan,Email:pzsi@cjlu.edu.cn

Issue Date: 05 September 2013

Cite this article:

He FENG,Ping-Zhan SI,Xiao-Fei XIAO, et al. Large scale synthesis of FeS coated Fe nanoparticles as reusable magnetic photocatalysts[J]. Front Mater Sci, 2013, 7(3): 308-311.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-013-0213-9
https://academic.hep.com.cn/foms/EN/Y2013/V7/I3/308

Fig.1 The XRD pattern of the Fe/FeS nanoparticles, which could be indexed with Fe, FeS, and trace amount of FeO.

Fig.2 TEM image of a Fe/FeS nanoparticle. The high resolution image of the surface area shows an inter-planar distance of 0.298 nm of the FeS. The compositional analysis indicates the coexistence of FeS and Fe in the interfacial area. The energy dispersive X-ray analysis indicates that the interfacial spot is mainly composed of Fe and S with an atomic ratio of ~1.6:1.

Fig.3 The magnetic hysteresis loops of the FeS/Fe nanoparticles measured at 78 and 230 K. The central portion was enlarged as shown in the fourth quadrant as an insert.

Fig.4 The absorbance spectral change of MB aqueous solution degraded by Fe/FeS nanoparticles under Xe lamp irradiation. The insets: the time dependence of the concentration of the MB solution, the color of the MB aqueous solution faded after degradation by Fe/FeS nanoparticles.

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