Abstract
Sol-gel processed silica materials, which incorporated ionic liquids and N,N,N′,N′-tetra(n-octyl)diglycolamide (TODGA), were prepared and used as sorbents for extraction of La 3+ and Ba 2+ from aqueous solutions. Imidazolium-based ionic liquids (ILs), 1-alkyl-3-methylimidazolium bis(trifluoromethane)sulfonimide ([C nmim][NTf 2], n = 2, 4, 6, 8, 10) were entrapped in these monolithic composite sol-gel sorbents. The corresponding extraction efficiencies were found to be dependent on both the volume of IL used in the silica matrix and the alkyl chain length of the IL cation. The silica composite sorbent containing [C 8mim][NTf 2] exhibited the best extraction efficiency for La 3+ and the best separation factor for La 3+/Ba 2+. The separation results were analyzed by both Langmuir and Freundlich adsorption isotherm models and the Freundlich model was found to give better fit.
| Original language | English |
|---|---|
| Pages (from-to) | 244-249 |
| Number of pages | 6 |
| Journal | Separation Science and Technology (Philadelphia) |
| Volume | 47 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 2012 |
Funding
This research was supported by the U.S. Department of Energy, the Office of Nuclear Physics, the 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. BY and JRB acknowledge the Oak Ridge Associated Universities (ORAU) for postdoctoral fellowships.
| Funders | Funder number |
|---|---|
| Office of Basic Energy Sciences | |
| Office of Nuclear Physics | |
| UT-Battelle | |
| U.S. Department of Energy | |
| Oak Ridge National Laboratory | |
| Chemical Sciences, Geosciences, and Biosciences Division | DE-AC05-0096OR22725 |
Keywords
- La /Ba
- TODGA
- ionic liquids
- silica sol-gel composite