Preparation and characterization of Schiff-base modified Fe3O4 hybrid material and its selective adsorption for aqueous Hg2+
2022
Zeng, Xiangchu | Zhang, Guanghua | Wu, Zhe
A Fe₃O₄ hybrid material (Fe₃O₄@SiO₂-S₂) modified by Schiff-base was prepared by grafting methyl acrylate (MA), ethylenediamine (EDA), and salicylaldehyde (SA) to the prepared magnetic hybrid material (Fe₃O₄@SiO₂-NH₂) successively; what’s more, the structure was characterized by FTIR, XRD, SEM, TEM, and VSM. The results showed that the Fe₃O₄@SiO₂-S₂ has an obvious core–shell structure and a saturation magnetization of 45.9 emu/g. Study on the adsorption of aqueous heavy metal ions showed that Fe₃O₄@SiO₂-S₂ posed selective adsorption for Hg²⁺ with the saturated adsorption capacity of 362 mg/g (1.12 mmol/g), which was superior to Fe₃O₄@SiO₂-NH₂, Fe₃O₄@SiO₂-HO-S, and other adsorbents, at the condition of pH = 6, 45℃, the adsorption capacity remained 89% after 5 cycles of adsorption–desorption; what is more, adsorption equilibrium was reached at about 300 min, and the adsorption isotherm conformed to the Langmuir isotherm adsorption model; in addition, pseudo-second-order model could be well described the adsorption kinetic process of Fe₃O₄@SiO₂-S₂ to Hg²⁺. The adsorption mechanism demonstrated that the N atoms of Schiff-base were mainly contributed to the adsorption of Hg²⁺; what is more, the N atom of tertiary amine and the O atoms of hydroxy and carbonyl also help to the adsorption of Hg²⁺.
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