Extraction of Rare Earth Elements(III) from Nitric Acid Solutions with Binary Extractants Based on Dialkylamino Derivati
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ICAL CHEMISTRY OF SOLUTIONS
Extraction of Rare Earth Elements(III) from Nitric Acid Solutions with Binary Extractants Based on Dialkylamino Derivatives of Carbamoylmethylphosphine Oxides and Dinonylnaphthalenesulfonic Acid A. N. Turanova, V. K. Karandashevb, *, O. I. Artyushinc, E. V. Sharovac, and V. A. Khvostikovb aInstitute
of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia cNesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, 119991 Russia *e-mail: [email protected] b
Received January 31, 2020; revised March 2, 2020; accepted March 27, 2020
Abstract—Interphase distribution of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y between aqueous HNO3 solutions and solutions of binary extractants obtained by reaction of equimolar amounts of dialkylamino derivatives of carbamoylmethylphosphine oxides and dinonylnaphthalenesulfonic acid in organic solvents has been studied. Stoichiometry of extracted complexes has been determined, effect of HNO3 concentration in aqueous phase and organic solvent nature on the efficiency of metal ion recovery into organic phase has been considered. On the formation of extractable REE(III) complexes, the cationic moiety of binary extractant provides coordination solvation of REE(III) ions, while anionic moiety offers their high hydrophobicity, which favors to the efficient transition of metal ions into organic phase. Keywords: rare earth elements, carbamoylmethylphosphine oxides, dinonylnaphthalenesulfonates, ionic liquids DOI: 10.1134/S0036023620080185
INTRODUCTION Extraction methods are widely used for recovery, preconcentration, and separation of actinides and rare earth elements (REE) from solutions obtained on the processing of spent nuclear fuel [1]. High extraction ability toward these elements is shown by polydentate organophosphorus compounds [2–9], diamides of malonic [10], diglycolic [11] and N-heterocyclic carboxylic acids [12], organophosphorus acids [13], salts of quaternary ammonium bases (QAB) [14], as well as binary extractants: salts of amines and QAB with organic acid anions [15–21]. The latter can be classified as functionalized ionic liquids (FIL) whose anionic moiety participates in complexation with metal ion. In recent time, there is growing interest in the use of FIL in extraction practice for preconcentration and separation of actinides and REE(III) [22]. Extraction properties were studied for FIL synthesized by introducing thioether [23], monoaza crown ether [24], phosphoryl [25], calixarene–phosphine oxide [26], malonamide [27], diglycolamide [28], carbamoylphosphone oxide (CMPO) [29–31] and other
coordinating groups into cationic (1-alkyl-3methylimidazolium) moiety of ionic liquid molecule. The anionic moiety of these FIL were mainly hexafluorophosphate or bis[(trifluoromethyl)sulfonyl]imide anions. The aim of this work is to
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