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Polyoxime-Functionalized Magnetic Nanoparticles for Uranium Adsorption with High Selectivity over Vanadium

Abstract

Competition between uranium ions and other metal ions is one of the great challenges for recovery of uranium (VI) from seawater. In particular, vanadium ions that bind strongly to sorbents are hardly stripped off, largely decreasing sorption capability of the sorbents for uranium. In this study, polyoxime was for the first time designed and conjugated onto magnetic nanoparticles for selective sorption of uranium (VI) against vanadium. Magnetic iron oxide nanoparticles were first grafted with polyglycerol on the surface, and then conjugated with oxime groups via esterification and oximation to give polyoxime-functionalized magnetic nanoparticles (POMN). POMN showed superior aqueous dispersibility and could be readily recovered by magnetic separation. The uranium (VI) sorption of POMN achieved equilibrium in 5 min with a capacity of 141.4 mg/g in single-element solution of uranium at pH 8.0 and 298.15 K. The sorption in simulated seawater demonstrated that the POMN possessed excellent selectivity for uranium (VI) against vanadium(V) and other competing metal ions. No significant change in sorption efficiency and selectivity for uranium was observed following four sorption-desorption cycles using Na2CO3 solution as an eluent. This work may unfold a new approach for selective sorption of uranium in seawater.

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Publication details

The article was received on 28 Mar 2017, accepted on 10 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7TA02684F
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Polyoxime-Functionalized Magnetic Nanoparticles for Uranium Adsorption with High Selectivity over Vanadium

    M. Xu, X. Han and D. Hua, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA02684F

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