Abstract
Schiff base decorated magnetic composites (Fe3O4@SiO2-HO-S and Fe3O4@SiO2-HE-S) were synthesized via homogeneous and heterogeneous method, respectively. The adsorption property for Co(II) and Zn(II) from ethanol was investigated systematically by considering the effects of contact time, temperature, initial metal ion concentration, and coexisting metal ion. Result shows that the magnetic composites exhibit better adsorption performance toward Co(II) and Zn(II) as compared with Fe(III), Cd(II), and Cu(II). The adsorption of Co(II) and Zn(II) can reach equilibrium at about 175 and 200 min, respectively. Adsorption kinetic can be well fitted by pseudo-second-order model and is controlled by film diffusion process. Adsorption isotherm indicates that the adsorption favors high initial metal ion concentration and temperature. The adsorption isotherm suggests the adsorption proceeds by monolayer behavior and chemical mechanism. Thermodynamic parameters demonstrate that the adsorption is exothermic, spontaneous, and entropy increased process. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculation demonstrate the participation of nitrogen and oxygen atoms during the adsorption, and nitrogen atoms play the dominant role for the adsorption. Regeneration indicates Fe3O4@SiO2-HE-S and Fe3O4@SiO2-HO-S can be reused as promising adsorbents for the removal of metal ion from ethanol.
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