Journal of Jishou University(Natural Sciences Edition) ›› 2025, Vol. 46 ›› Issue (3): 46-61.DOI: 10.13438/j.cnki.jdzk.2025.03.007

• Chemistry • Previous Articles     Next Articles

Preparation of a Fe3O4@SiO2@Fe-MIL-101 for the Adsorption Removal of Fluoride in Zinc Sulfate Electrolyte

LIAO Jia,WANG Chunmei,LI Fei,YANG Chengcheng,GUO Xianyu,TAN Wentao,LI Hui   

  1. (College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,Hunan China)
  • Online:2025-05-25 Published:2025-06-12
  • Supported by:
    National Natural Science Foundation of China (21865011);2024 Innovation and Entrepreneurship Project of College Student in Jishou University (JDCX20241122)

Abstract: To remove the fluoride in zinc sulfate electrolyte to an appropriate level,mitigate environmental fluoride pollution,and drive the development of the hydrometallurgy industry of zinc,a novel Fe3O4@SiO2@Fe-MIL-101 magnetic composite material was successfully synthesized via the one-pot method.Preparation conditions were optimized and structural characterization of this material conducted using FTIR,SEM,EDS,XRD and Hysteresis analysis.The results show that this composite exhibits a more rapid fluoride adsorption dynamics and a higher fluoride adsorption capacity (18.34 mg/g) and its adsorption behavior fitted for the first order dynamic model and the Freundlich isotherm model.The adsorption of fluorine by this composite is mainly physical adsorption according to the mean adsorption energy (1.216 kJ/mol).The interfering ions co-existed in fluoride-containing solutions,like HCO-3,NO- and Cl-,have a significant effect on fluorine adsorption.This composite has also been proved with magnetism,higher adsorption selectivity and satisfactory reusability.When this composite is employed as an adsorbent for adsorption removing fluoride in zinc sulfate electrolyte,it exhibits higher pH-dependent behavior as well as high fluoride removal efficiency at pH 6.5.

Key words: Fe3O4@SiO2@Fe-MIL-101 composite, fluoride, removal, adsorption, zinc sulfate electrolyte

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