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Abstract: The Cu2+ ion-imprinted magnetic chitosan beads (MIPs) were prepared by chitosan, using Fe3O4 as magnetic core, Cu2+ ion as template, and chitosan as functional monomers. The optimum preparation conditions were confirmed by investigating the dosage of chitosan, Fe3O4 and cross-linker. The MIPs were characterized by scanning electron microscope (SEM), Fourier transformation infrared (FTIR) spectroscope and vibrating sample magnetometer (VSM). The results showed that the Cu2+ ion imprinted magnetic chitosan beads had a 3-dimension network structure. The magnetic properties were measured by vibrating sample magnetometer and the saturation magnetization was 0.39 A m-1. The adsorption of Cu2+ ion on MIPs was investigated by static adsorption method. The adsorption isotherm study showed that the Langmuir isotherm equation was best fitted for the monolayer adsorption processes. The MIPs were used for selectivity adsorption of Cu2+, Zn2+, Co2+ and Ni2+ ions in an aqueous solution. The results showed a high selectivity toward Cu2+ ion in the mixture solution, the selectivity coefficients (K) of MIPs for Cu2+/Zn2+, Cu2+/Ni2+ and Cu2+/Co2+ were 40.13, 71.21 and 128.13, respectively. Furthermore, the MIPs could be regenerated and reused for 10 times without a significant decrease in adsorption capacity. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
Template and target information: copper ion, Cu(II)
Author keywords: adsorption, chitosan, imprinting, Magnetic, selective recognition