Polymer-Supported Primary Amines for the Recovery of Uranium from Seawater

The primary amine −CH2NH2 ligand bound to cross-linked polystyrene has a high affinity for the uranyl ion from a matrix of artificial seawater. The uranyl capacity is 14.8 mg U/gpolymer, compared to 2.34 mg U/gpolymer for a diamidoxime ligand on a polystyrene support. Secondary and tertiary amines h...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 52; no. 33; pp. 11792 - 11797
Main Authors Sellin, Remy, Alexandratos, Spiro D
Format Journal Article
LanguageEnglish
Published American Chemical Society 21.08.2013
Subjects
Affinity
Amines
Ligands
Mathematical analysis
Polystyrene resins
Sea water
Steric effects
Uranium
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Summary:The primary amine −CH2NH2 ligand bound to cross-linked polystyrene has a high affinity for the uranyl ion from a matrix of artificial seawater. The uranyl capacity is 14.8 mg U/gpolymer, compared to 2.34 mg U/gpolymer for a diamidoxime ligand on a polystyrene support. Secondary and tertiary amines have much lower affinities, indicating that steric effects are important to the complexation. The results with polystyrene-bound −CH2NH2 thus suggest at least a 3-fold increase in uranyl capacity (calculated on a per mole ligand basis (not per gram of polymer, in order to make the results independent of the weight of the polymer support)) and a 4-fold increase when ligands with two primary amines per ligand are utilized. An additional advantage of the primary amine over amidoxime is that it is a simpler ligand to prepare.
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ISSN:0888-5885
1520-5045
DOI:10.1021/ie401979e