Improvement of the cloud point extraction of uranyl ions by the addition of ionic liquids
Gao, S; Sun, T; Chen, Q; Shen, X
HERO ID
2232693
Reference Type
Journal Article
Year
2013
Language
English
PMID
| HERO ID | 2232693 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Improvement of the cloud point extraction of uranyl ions by the addition of ionic liquids |
| Authors | Gao, S; Sun, T; Chen, Q; Shen, X |
| Journal | Journal of Hazardous Materials |
| Volume | 263 Pt 2 |
| Page Numbers | 562-568 |
| Abstract | The cloud point extraction (CPE) of uranyl ions by different kinds of extractants in Triton X-114 (TX-114) micellar solution was investigated upon the addition of ionic liquids (ILs) with various anions, i.e., bromide (Br(-)), tetrafluoroborate (BF4(-)), hexafluorophosphate (PF6(-)) and bis[(trifluoromethyl)sulfonyl]imide (NTf2(-)). A significant increase of the extraction efficiency was found on the addition of NTf2(-) based ILs when using neutral extractant tri-octylphosphine oxide (TOPO), and the extraction efficiency kept high at both nearly neutral and high acidity. However, the CPE with acidic extractants, e.g., bis(2-ethylhexyl) phosphoric acid (HDEHP) and 8-hydroxyquinoline (8-HQ) which are only effective at nearly neutral condition, was not improved by ILs. The results of zeta potential and (19)F NMR measurements indicated that the anion NTf2(-) penetrated into the TX-114 micelles and was enriched in the surfactant-rich phase during the CPE process. Meanwhile, NTf2(-) may act as a counterion in the CPE of UO2(2+) by TOPO. Furthermore, the addition of IL increased the separation factor of UO2(2+) and La(3+), which implied that in the micelle TOPO, NTf2(-) and NO3(-) established a soft template for UO2(2+). Therefore, the combination of CPE and IL provided a supramolecular recognition to concentrate UO2(2+) efficiently and selectively. |
| Doi | 10.1016/j.jhazmat.2013.10.014 |
| Pmid | 24225581 |
| Wosid | WOS:000330814600037 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | Uranium; Cloud point extraction; Ionic liquids |