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Abstract: The ion-imprinted magnetic chitosan resins (IMCR) prepared using uranium [U(VI)] as a template have the diameter of 10 μm~35 μm and the magnetic strength of 29.7 emu/g. The optimum pH value for U(VI) adsorption onto IMCR was pH 5.0, and U(VI) adsorption capacity decreased with the temperature increasing. The adsorption process was spontaneous and exothermic, following the second-order kinetics. Equilibrium isotherms were well-fitted with Langmuir isotherm equation for the monolayer adsorption. The E values (>8 kJ/mol) calculated from Dubinin-Radushkevich model indicate that the adsorption of the U(VI) ions is predominant on the chemisorptions process. The maximum adsorption capacity value 187.3 mg/g for IMCR is higher than that for un-imprinted resins (NIMCR160.8 mg/g). Moreover, the higher selectivity for U(VI) was also observed for IMCR. The regeneration of IMCR could be achieved using 0.5 mol/L ethylenediaminetetraacetic acid solution for adsorbing U(VI) again
Template and target information: uranium ion, U(VI)
Author keywords: chitosan, Ion-imprinted resins, Magnetic adsorption, U(VI) ions