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A novel amino-functionalized Fe3O4@SiO2 magnetic nanomaterial with a core–shell structure was developed,aiming to remove heavy metal ions from aqueous media. The structural, surface, and magneticcharacteristics of the nanosized adsorbent were investigated by elemental analysis, FTIR, N2 adsorption–desorption, transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy,vibrating sample magnetometry, thermogravimetric analysis, and zeta-potential measurement.The amino-functionalized Fe3O4@SiO2 nanoadsorbent exhibited high adsorption affinity for aqueousCu(II), Pb(II), and Cd(II) ions, resulting from complexation of the metal ions by surface amino groups.Moreover, the adsorption affinity for heavy metal ions was not much impacted by the presence of a cosoluteof humic acid (10.6 mg/L) or alkali/earth metal ions (Na+, K+, Mg2+) (0.025–0.30 mmol/L). The metalloadedFe3O4@SiO2–NH2 nanoparticles could be recovered readily from aqueous solution by magneticseparation and regenerated easily by acid treatment. Findings of the present work highlight the potentialfor using amino-functionalized Fe3O4@SiO2 magnetic nanoparticles as an effective and recyclable adsorbentfor the removal of heavy metal ions in water and wastewater treatment.
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