Selective Adsorption of Uranium(VI) on U(VI) Ion-Imprinted Chitosan Composite Magnetic Microsphers

SummaryHerein we present a survey of the literature covering the development of molecular imprinting science and technology over the years 2004 to 2011. In total, 3779 references to the original papers, reviews, edited volumes and monographs from this period are included, along with recently identified uncited materials from prior to 2004 which were omitted in the first instalment of this series covering the years 1930 to 2003. 1 In the presentation of the assembled references, a section presenting reviews and monographs covering the area is followed by sections describing fundamental aspects of molecular imprinting including the development of novel polymer formats. Thereafter, literature describing efforts to apply these polymeric materials to a range of application areas is presented. Current trends and areas of rapid development are discussed.2

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Molecular imprinting science and technology: a survey of the literature for the years 2004-2011

Whitcombe

2014

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Selective adsorption of uranium (VI) on NaHCO3 leached composite γ-Methacryloxypropyltrimethoxysilane coated magnetic Ion-imprinted polymers prepared by precipitation polymerization

Tavengwa¹,

Cukrowska²,

Chimuka³

2015

S.Afr.j.chem

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Ion imprinted nano-magnetic composite polymers for selective removal of hexavalent uranium were prepared by a precipitation polymerization technique in the presence of ã-methacryloxypropyltrimethoxysilane (ã-MPS) coated magnetite and other pre-polymerization reagents. The synthesized magnetic polymers were then leached with NaHCO 3 to produce magnetic ion imprinted polymers (IIPs) with fabricated adsorption sites complementary to the uranyl ions in terms of size and shape. Several parameters were investigated to obtain conditions which gave the optimum adsorption of the uranyl onto the magnetic IIPs and their corresponding controls, magnetic ion non-imprinted polymers (NIPs). The optimum amount of magnetic sorbent, initial concentration and contact time were 50 mg, 2.5 mg L -1 and 45 min, respectively. The adsorption capacity of the magnetic IIP (1.15 ± 0.01 mg g -1 ) was higher than that of the magnetic NIP (0.93 ± 0.02 mg g -1 ). This indicated that the former had a somewhat higher affinity for U(VI) than the later. The magnetic polymers also displayed good selectivity of the order: U(VI) > Ni(II) > Mg(II). After six cycles of use, the magnetic polymers illustrated good stability and reusability.

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Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe<sub>3</sub>O<sub>4</sub> for selective extraction of hexavalent uranium

Tavengwa¹,

Cukrowska²,

Chimuka³

2014

WSA

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A selective and reliable method for the extraction of trace quantities of U(VI) by the use of a magnetic U(VI) ion-imprinted polymer (IIP) was developed. In this study, oleic acid (OA) coated magnetite nano-particles were incorporated into the cross-linked polymeric matrix of the selective sorbent, in order to gain the physical advantages of separating the polymers. Many physico-chemical factors influence the adsorption process; uranyl ion uptake ability based on these parameters was investigated. The optimum parameters obtained were sample pH 4, 50 mg of the magnetic polymer, a contact time of 45 min and an initial U(VI) concentration of 2 mg·ℓ , respectively. The adsorption behaviour of U(VI) in the presence of other competing metal ions onto the cross-linked magnetic polymers was also examined in binary mixtures and the order of selectivity was found to be U(VI) > Pb(VI) > Ni(II). The resulting magnetic nano-composite polymers were found to be stable up to the sixth cycle of use and reuse. The Freundlich adsorption model was used for the mathematical description of the adsorption equilibrium and the adsorption kinetic data fitted the pseudo-first-order model with R 2 > 0.92.

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Selective Adsorption of Uranium(VI) on U(VI) Ion-Imprinted Chitosan Composite Magnetic Microsphers

Cited by 3 publications

References 19 publications

Molecular imprinting science and technology: a survey of the literature for the years 2004-2011

Molecular imprinting science and technology: a survey of the literature for the years 2004-2011

Selective adsorption of uranium (VI) on NaHCO3 leached composite γ-Methacryloxypropyltrimethoxysilane coated magnetic Ion-imprinted polymers prepared by precipitation polymerization

Synthesis of bulk ion-imprinted polymers (IIPs) embedded with oleic acid coated Fe<sub>3</sub>O<sub>4</sub> for selective extraction of hexavalent uranium

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