Extraction of Lanthanides(III) from Aqueous Nitric Acid Solutions with Tetra(n-octyl)diglycolamide into Methyltrioctylammonium Bis(trifluoromethanesulfonul)imide Ionic Liquid and Its Mixtures with Molecular Organic Diluents

Abstract

The extraction of lanthanides(III) from aqueous nitric acid solutions with tetra(n-octyl)diglycolamide into methyltrioctylammonium bis(trifluoromethanesulfonul)imide ([N1888][Tf2N]) ionic liquid and its mixtures with molecular organic diluents is investigated in this study. This study also investigates the effect of HNO3 concentration in the aqueous phase on the extraction of Ln(III) ions. Subsequently, the stoichiometry of the extracted complexes is determined, and the mechanism of Ln(III) extraction in a system with [N1888][Tf2N] is discussed. It is shown that the intragroup selectivity of the extraction of Ln(III) ions is significantly higher when using [N1888][Tf2N] than when using the imidazolium-based ionic liquid [C4mim][Tf2N].

Recent Uses of Ionic Liquids in the Recovery and Utilization of Rare Earth Elements

“…These series of references [54][55][56] investigated the extraction of lanthanides using the extractants showed in the next Table 9. Studying these references, it can be concluded that the data has not practical interest since the diluent used in the investigation is highly toxic, the same can be extended to the results derived from the utilization of nitrobenzene, chloroform and 1,2-dichloroethane using TODGA plus ILs in the extraction of the lanthanides.…”

Efficient Metal Extraction from Dilute Solutions: A Review of Novel Selective Separation Methods and Their Applications

“…Turanov et al [205] explored the extraction of trivalent lanthanides from nitric acid aqueous solution. They investigated the extraction of Ln(III) ions (concentrations 0.002 mM) using TODGA(N,N,N,N Tetraoctyl Diglycolamide, C 36 H 72 N 2 O 3 ) and TBP (Tributyl phosphate, C 12 H 27 O 4 P) neutral extractants, along with [N1888][Tf 2 N] ionic liquid as a diluent.…”