Solvent Extraction Research and Development, Japan
Online ISSN : 2188-4765
Print ISSN : 1341-7215
ISSN-L : 1341-7215
Original Articles
Selective Separation of Trivalent Europium(III) from Americium(III) using N,N′Dimethyl-N,N′-di-2-phenylethyl-diglycol Amide (MPEDGA) Extractant in Ionic Liquid
Seong-Yun KIMTadayuki TAKAHASHIHao WU
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2021 Volume 28 Issue 1 Pages 49-57

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Abstract

A diglycolamide based N,N′-Dimethyl-N,N′-di-2-phenylethyl-diglycol amide (MPEDGA) extractant was synthesized and dissolved into 1-butyl-3-methylimidazolium nonafluorobutanesulfonate ([C4mim][NfO]) to prepare the extraction phase. Its separation performance of Am-241 with Eu-152 in nitric acid solution was investigated. The extraction kinetics were fast and could reach equilibrium within 15 min. When [HNO3] = 0.1 M, the maximum SFEu-152/ Am-241 was obtained as 124. Moreover, with increase in the concentration of HNO3, the extraction ability decreased gradually, and SFEu-152/ Am-241 decreased as 3 when [HNO3] reached 4 M.Back extraction was successfully completed by using 1 M guanidine carbonate with 0.5 M ethylenediaminetetraacetic acid (EDTA) or 1 M guanidine carbonate with 0.5 M diethylenetriaminepentaacetic acid (DTPA), respectively. Slope analysis revealed a 1:3 complex was formed. Effect of temperature further clarified the extraction process was exothermic.

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