No abstract

A B S T R A C TA new type of Zn 2+ ion-imprinted polymer (Zn 2+ -IIP) was synthesized on the surface of attapulgite, displaying high affinity and selectivity to Zn 2+ . Fourier transform infrared spectra (FTIR) revealed Zn 2+ -IIP to be an organic-inorganic hybrid polymer, with Zn 2+ imprinted cavities formed by CTS groups and connected to the surface of the attapulgite by A-187 cross-linked network. The adsorption kinetic investigation showed that the adsorption of Zn 2+ on Zn 2+ -IIP was a pseudo-second-order process. The maximum adsorption capacities of Zn 2+ were 0.536, 0.665, 0.715, and 0.722 meq/g at 288, 298, 308, and 318 K, respectively, where the activation energy, E a , was evaluated as 23.8 kJ/mol. By thermodynamic study, ΔH˚and ΔS˚of the adsorption were determined as 30.862 kJ/mol and 108.664 J/mol K, respectively, while the negative ΔG˚decreased with rising temperatures, indicating that the adsorption process was feasible and spontaneous. The adsorption selectivity of the Zn 2+ -IIP was also investigated via competitive adsorption of Zn 2+ , Cd 2+ , Cs + , Co 2+ , Ba 2+ , Sr 2+ , and Pb 2+ from a mixture, demonstrating that Zn 2+ -IIP had the capability of recognizing Zn 2+ with high affinity and selectivity. The study of multi adsorption-desorption cycles showed that the Zn 2+ -IIP can be reused many times without a significant decrease in the adsorption capacity.

No abstract

No abstract