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Abstract: This article describes the preparation of a La(III) ion-imprinted nanoparticles (NPs) containing the La(III)-chelating ligand 2,2':6',6''-terpyridine (terpy). La(III) forms stable 1:1 and 1:2 complexes with terpy in acetonitrile solution. The NPs were prepared from ethyleneglycol dimethacrylate (the cross-linking monomer) via precipitation polymerization in the presence of the La(III)-terpy complex. La(III) ions were then removed from the NPs with nitric acid. The NPs were characterized by IR spectroscopy, scanning electron microscopy and elemental analysis. SEM micrographs showed the colloidal NPs to be slightly irregularly shaped and to have a diameter of 50 to 100 nm. The optimum pH value for sorption is 3.5. Sorption and desorption of La(III) is complete within 2 to 30 min. La(III) was quantified by ICP-AES. Figures of merit include a sorbent capacity for La(II) of 133.8 mg g-1, an enrichment factor of 17.5, a relative standard deviation of the determination of 1.7 % (at 3Sb/m), and a detection limit of 1.4 ng mL-1. The results indicate an increased affinity of the material toward La(III) over other multivalent metal ions of smaller ionic radius. The imprinted NPs were regenerated twenty times without a significant loss in affinity
Template and target information: lanthanum ion, La(III)
Author keywords: La(III), Ion-imprinted nanoparticles (NPs), precipitation polymerization, Terpyridine, sorption, Desorption