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Issue 15, 2018
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Insight into selectivity: uptake studies of radionuclides 90Sr2+, 137Cs+, and 233UO22+ with bis-amidoxime polymers

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Abstract

Uptake characteristics of a bis-amidoximated polymer are presented for 90Sr2+, 137Cs+, and 233UO22+ to assess rational ligand design and polymer engineering efforts applied to selective uranium extraction. Functionalized with the bis-amidoxime diaryl ether ligand at a loading of 1.98 mmol per gram of polymer, the polymer was found to sorb uranium from a pH 6 solution with a separation factor (α) over cesium of 1.2 × 103. Strontium uptake was negligible throughout the pH range studied whereas cesium uptake averaged <30%. Moreover, at near neutral pH, the sorbent was able to purify water to below the United States’ set maximum contaminant level for uranium, decreasing the U concentration from 330 ppb to below 3 ppb in 30 minutes. Density functional theory (DFT) calculations, used to probe the nature of the metal-bis-amidoxime interaction, help inform the empirically realized uptake selectivity.

Graphical abstract: Insight into selectivity: uptake studies of radionuclides 90Sr2+, 137Cs+, and 233UO22+ with bis-amidoxime polymers

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The article was received on 30 Dec 2017, accepted on 19 Mar 2018 and first published on 28 Mar 2018


Article type: Paper
DOI: 10.1039/C7DT04935H
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Dalton Trans., 2018,47, 5348-5358

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    Insight into selectivity: uptake studies of radionuclides 90Sr2+, 137Cs+, and 233UO22+ with bis-amidoxime polymers

    M. Piechowicz, R. Chiarizia and L. Soderholm, Dalton Trans., 2018, 47, 5348
    DOI: 10.1039/C7DT04935H

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