A novel “core/shell” structured magnetic nanocomposite Si-Fe-MNCs was prepared by coating SiO2 on the surface of Mn-Zn ferrite magnetic nanoparticles (Fe-MNPs) through in-situ hydrolysis of tetraethylorthosilicate (TEOS). The specific surface area, morphology, magnetic properties and surface species of Si-Fe-MNCs were characterized by N2 -adsorption/desorption, transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy, respectively. The synthesized magnetic adsorbents exhibited a good performance in the removal of methylene blue (MB) from water, and gave a maximum adsorption capacity of 184.1mg/g at 318K. The adsorption of MB on Si-Fe-MNCs reached equilibrium at 120min, and exhibited the kinetics of pseudo-second-order model according to the Langmuir adsorption isotherms. Additionally, it was found that the adsorption of MB on Si-Fe-MNCs was a spontaneous endothermic physical process according to thermodynamic calculations. FT-IR revealed that MB mainly interacted with the surface functional groups of Si-Fe-MNCs and MB through hydrogen bond. The regeneration of Si-Fe-MNCs after MB adsorption was found to be realized by conducting H2O2, and its adsorption capacity could preserve an excellent level of 93.64mg/g after five runs.
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