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Abstract: Cu2+ ion imprinted magnetic chitosan beads (MIPs) were synthesized using Fe3O4 as the magnetic core, Cu2+ as the template ion, and chitosan as the functional monomer. The structure and properties of the MIPs were studied by TEM, XRD, VSM, FTIR and XRD, and the results show that the MIPs has a 3-dimension network structure with Fe3O4 uniformly distributed inside. The magnetic properties were measured by vibrating sample magnetometer and the saturation magnetization was 10.8 emu g-1. Cu2+ adsorption was investigated by a static adsorption method. The results show that the optimum adsorption pH value is ~ 5, and the adsorption equilibrium is established within 3 h. The kinetic study shows that the adsorption process follows the pseudo-second-order kinetic equations. The selection recognition ability of the MIPs were evaluated by relative selectivity coefficient (K') in an aqueous solution. The results show that the MIPs has a high selectivity toward Cu2+, and the relative selectivity coefficient (K') of MIPs for Cu2+/Zn2+, Cu2+/Ni2+ and Cu2+/Co2+ are 2.07, 2.59 and 3.44, respectively. Furthermore, the MIPs can be regenerated and reused for 10 times without a significantly decrease of adsorption capacity. © 2016, Zhejiang University. All right reserved.
Template and target information: copper ion, Cu(II)
Author keywords: adsorption, characterization, chitosan, Magnetic, Metal ion-imprinted, selectivity