Abstract
ABSTRACT The extraction of lanthanides(III) from aqueous nitric acid solutions with tetra(n-octyl)diglycolamide into trioctylammonium di-2-ethylhexylsulfosuccinate ([N888H][SSu]) ionic liquid and its mixtures with molecular organic diluents is studied. It is showed that the efficiency and selectivity of the Ln(III) extraction from nitric acid solutions with TODGA into [N888H][SSu] is significantly higher than when using 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide IL [C4mim][Tf2N] as a diluent. Additionally, in the system with [N888H][SSu], the transfer of SSu− ions into the aqueous phase occurs to a much lesser extent than the transfer of Tf2N− in systems with [C4mim][Tf2N]. It is established that the efficiency of extraction of Ln(III) ions with TODGA increases significantly when [N888H][SSu] is added to the organic phase. The synergistic effect arises due to the higher hydrophobicity of the extractable Ln(III) complexes formed by the TODGA ligand and di-2-ethylhexylsulfosuccinate anions compared to those containing NO3 − ions as counterions. The stoichiometry of the extracted complexes is determined, and the influence of the composition of the aqueous phase, and the nature of the organic solvent on the efficiency of the Ln(III) extraction into the organic phase is considered.
Published Version
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