High-Performance Magnetic Fe₃O₄/SiO₂-NH₂ Nanocomposites: Synthesis and Application for the Removal of Zn²⁺ Ions from Water

In this study, magnetic Fe₃O₄@SiO₂-NH₂ (FSN) nanocomposite adsorbent was synthesized using a green and convenient method. The FSN adsorbent was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, and vibrating-sample magnetometry (VSM). The FSN nanocomposites exhibit excellent Zn²⁺ adsorption capacity. In addition, adsorption kinetics, isotherms, and adsorption mechanism of Zn²⁺ on the FSN nanocomposites were also studied. The FSN nanocomposites show rapid adsorption rate, easy separation process, and environmental friendliness, which are suitable for water and wastewater purification.