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Abstract: A new ion-imprinted polymer (IIP) was synthesized by thermal copolymerization of bis(2-methacryloxyethyl) phosphate as functional ligand and ethylene glycol dimethacrylate as cross-linker in the presence of Th4+ as a template ion. The molar ratio of the functional ligand to Th4+ was optimized to be 4 by 31P NMR titration, elemental analysis, and EXAFS, which was verified by comparing the adsorption capacities and selectivities of IIPs with different composition. Thorium(IV) ions were leached out using 0.1 mol L-1 ethylenediaminetetraacetic acid disodium salt and the prepared IIP was characterized by infra-red spectroscopy, thermogravimetric analysis and Brunauer-Emmett-Teller surface area measurement. It was found that the IIP could extract Th4+ from high acidity solution. The maximum adsorption capacity was as high as 33.3 mg g-1 in 1.0 mol L-1 HCl. Even in 6.0 mol L-1 HCl, its adsorption capacity was still considerable. Moreover, the IIP exhibited good selectivity towards Th4+, especially in the presence of competing ions such as La3+, Eu3+, Yb3+, UO22+, and Fe3+
Template and target information: thorium ion, Th(IV)