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Abstract: Acrylonitrile (AN) was graft-polymerized on micron-sized silicon particles, resulting in grafted particles PAN/SiO2. Subsequently, the grafted PAN was converted to poly(amidoxime) (PAO) via amidoximation reaction, obtaining functional particles PAO/SiO2. Then, the ionic imprinting towards the grafted PAO was performed with Gd3+ ion as template ion and glutaral as crosslinking agent by using the novel surface-molecular imprinting technique established by our research group, and the Gd3+ ion-imprinted material TIP-PAO/SiO2 was prepared. Rare earth element Eu and Sm are adjacent to Gd in lanthanum elements, and the ionic radius difference between Eu3+ and Sm3+ ions and Gd3+ ion is only 1 similar to 3 pm. In this work, with Eu3+ and Sm3+ ions as contrast substances, both static and dynamic methods were adopted to study the binding properties and ion recognition character of IIP-PAO/SiO2 for Gd3+ ion. The experiment results show that IIP-PAO/SiO2 have specific recognition selectivity and excellent binding affinity for Gd3+ ion, and the selectivity coefficients of IIP-PAO/SiO2 for Gd3+ ion with respect of Eu3+ ion and Sm3+ ion are 7.49 and 7.93, respectively. Besides, IIP-PAO/SiO2 has excellent elution property, with diluted HCl solution as eluent, the desorption ratios of Gd3+ ion reach 99.54% in 29 BV
Template and target information: Gd3+, gadolinium ion
Author keywords: Poly(amidoxime), silica gel, ionic imprinting, surface imprinting, rare earth ion, ion recognition