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Nonstoichiometric Zn Ferrite and ZnFe2O4/Fe2O3 Composite Spheres: Preparation, Magnetic Properties, and Chromium Removal

  • Structure of Matter and Quantum Chemistry
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Abstract

Monodisperse and porous nonstoichiometric Zn ferrite can be prepared by a solvothermal method. Such non-Zn ferrite was used to be the precursor for synthesis of ZnFe2O4/Fe2O3 composite via calcination at 600°C for 3 h in air. X-ray powder diffractometer (XRD) and Energy Dispersive Spectrometer (EDS) proved the nonstoichiometry of Zn ferrite synthesized by solvothermal method and the formation of ZnFe2O4/Fe2O3 composite via calcination. TEM image showed that non-Zn ferrite spheres with wormlike nanopore structure were made of primary nanocrystals. BET surface area of non-Zn ferrite was much higher than that of ZnFe2O4/Fe2O3 composite. Saturation magnetization of non-Zn ferrites was significantly higher than that of ZnFe2O4/Fe2O3 composites. Calcination of non-Zn ferrite resulted in the formation of large amount of non-magnetic Fe2O3,which caused a low magnetization of composite. Because of higher BET surface area and higher saturation magnetization, non-Zn ferrite presented better Cr6+ adsorption property than ZnFe2O4/Fe2O3 composites.

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Authors and Affiliations

  1. School of Chemistry and Materials Science, Ludong University, Yantai, 264025, China

    Chun-Liang Hang, Li-Xia Yang, Chang-Mei Sun & Ying Liang

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  1. Chun-Liang Hang
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  2. Li-Xia Yang
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  3. Chang-Mei Sun
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  4. Ying Liang
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Correspondence to Li-Xia Yang.

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Hang, CL., Yang, LX., Sun, CM. et al. Nonstoichiometric Zn Ferrite and ZnFe2O4/Fe2O3 Composite Spheres: Preparation, Magnetic Properties, and Chromium Removal. Russ. J. Phys. Chem. 92, 496–501 (2018). https://doi.org/10.1134/S0036024418030044

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  • DOI: https://doi.org/10.1134/S0036024418030044

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