Abstract
Three functionalized ionic liquids (ILs), tetrabutylammonium di(2-ethylhexyl)phosphate ([TBA][DEHP]), trioctylmethylammonium di(2-ethylhexyl)phosphate ([TOMA][DEHP]), and trihexyl(tetradecyl)phosphonium di(2-ethylhexyl)phosphate ([THTP][DEHP]), are synthesized and characterized. These ILs are used as DEHP-based ionic extractants and are investigated for rare earth elements (REEs) separation in 1-hexyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C6mim][NTf2]) and diisopropylbenzene (DIPB) along with di(2-ethylhexyl)phosphoric acid (HDEHP). Solubilities of the DEHP-based ionic extractants in [C6mim][NTf 2] are much better than that of HDEHP in [C6mim][NTf 2]. We herein report the achievement of enhanced extractabilities and selectivities for separation of REEs using DEHP-based ionic extractants in [C6mim][NTf2]. This work highlights the potential of developing a comprehensive ionic liquid-based extraction strategy for REEs using ionic liquids as both extractant and diluent.
| Original language | English |
|---|---|
| Pages (from-to) | 132-137 |
| Number of pages | 6 |
| Journal | Talanta |
| Volume | 90 |
| DOIs | |
| State | Published - Feb 15 2012 |
Funding
This research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences under Contract DE-AC05-0096OR22725 with Oak Ridge National Laboratory , managed by UT-Battelle, LLC. XQS acknowledges Oak Ridge Associated Universities for postdoctoral fellowships.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory | |
| Chemical Sciences, Geosciences, and Biosciences Division | DE-AC05-0096OR22725 |
| UT-Battelle |
Keywords
- Functionalized ionic liquid
- Rare earth elements
- Solvent extraction