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Reference type: Journal
Authors: Singh DK, Mishra S
Article Title: Synthesis and characterization of UO22+-ion imprinted polymer for selective extraction of UO22+.
Publication date: 2009
Journal: Analytica Chimica Acta
Volume: 644
Issue: (1-2)
Page numbers: 42-47.
DOI: 10.1016/j.aca.2009.04.020
Alternative URL: http://www.sciencedirect.com/science/article/B6TF4-4W3PT73-2/2/d8f02958b3bc3b6c9ff42f1b082a2b76

Abstract: Ion-imprinted polymers (IIPs) were prepared for uranyl ion (imprint ion) by formation of binary (salicylaldoxime (SALO) or 4-vinylpyridine (VP)) or ternary (salicylaldoxime and 4-vinylpyridine) complex in 2-methoxy ethanol (porogen) following copolymerization with methacrylic acid (MAA) as a functional monomer and ethylene glycol dimethacrylate (EGDMA) as crosslinking monomer using 2,2'-azobisisobutyronitrile as initiator. Control polymers (CPs) were also prepared under identical experimental conditions without using imprint ion. The above synthesized polymers were characterized by surface area measurement, microanalysis and FT-IR analysis techniques. The imprinted polymer formed with ternary complex of UO22+-SALO-VP (1:2:2, IIP3) showed quantitative enrichment of uranyl ion from dilute aqueous solution and hence was chosen for detailed studies. The optimal pH for quantitative enrichment is 3.5-6.5. The adsorbed UO22+ was completely eluted with 10ámL of 1.0áM HCl. The retention capacity of IIP3 was found to be 0.559ámmolág-1. Further, the distribution ratio and selectivity coefficients of uranium and other selected inorganic ions were also evaluated. Five replicate determinations of 25áμgáL-1 of uranium(VI) gave a mean absorbance of 0.032 with a relative standard deviation of 2.20%. The detection limit corresponding to three times the standard deviation of the blank was found to be 5áμgáL-1. IIP3 was tested for preconcentration of uranium(VI) from ground, river and sea water samples
Template and target information: uranyl ion, UO2 2+
Author keywords: Ion-imprinted polymer, Salicylaldoxime, uranyl ion, preconcentration, Ternary complex

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