Fe3O4@SiO2@Fe-MIL-101的制备及其对硫酸锌电解液中氟化物的吸附去除

doi:10.13438/j.cnki.jdzk.2025.03.007

摘要/Abstract

摘要：为了将硫酸锌电解液中的氟化物去除至适度水平，减少环境氟污染并推动锌湿法冶金行业发展，采用一锅法制备一种新型Fe₃O₄@SiO₂@Fe-MIL-101磁性复合材料，并对制备条件进行优化，利用FTIR、SEM、EDS、XRD和磁滞分析进行结构表征.结果表明，Fe₃O₄@SiO₂@Fe-MIL-101磁性复合材料具有较快的氟吸附动力学特性和较高的氟吸附量(18.3 mg/g)，其吸附行为符合一级动力学模型和Freundlich等温线模型；根据平均吸附能(1.216 kJ/mol)可知，吸附过程以物理吸附为主；含氟溶液中共存的干扰离子（如HCO^-₃，NO^-₃和Cl^-）对氟的吸附影响显著；Fe₃O₄@SiO₂@Fe-MIL-101复合材料具有磁性、较高的吸附选择性和良好的可重复使用性，在吸附去除硫酸锌电解液中的氟化物时，有较高的pH值依赖性，当pH值为6.5时，除氟效率最高.

关键词： Fe₃O₄@SiO₂@Fe-MIL-101复合材料, 氟化物, 去除, 吸附, 硫酸锌电解液

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

廖佳, 王春梅, 李飞, 杨城城, 郭先育, 谭文涛, 李辉. Fe₃O₄@SiO₂@Fe-MIL-101的制备及其对硫酸锌电解液中氟化物的吸附去除[J]. 吉首大学学报（自然科学版）, 2025, 46(3): 46-61.

LIAO Jia, WANG Chunmei, LI Fei, YANG Chengcheng, GUO Xianyu, TAN Wentao, LI Hui. Preparation of a Fe₃O₄@SiO₂@Fe-MIL-101 for the Adsorption Removal of Fluoride in Zinc Sulfate Electrolyte[J]. Journal of Jishou University(Natural Sciences Edition), 2025, 46(3): 46-61.

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Fe₃O₄@SiO₂@Fe-MIL-101的制备及其对硫酸锌电解液中氟化物的吸附去除

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

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