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Solvent Extraction and Stripping of Silver Ions in Room-Temperature Ionic Liquids Containing Calixarenes
Abstract
We found that a calix[4]arene-bearing pyridine is soluble in a typical room-temperature ionic liquid (RTIL), 1-alkyl-3-methylimidazolium hexafluorophosphate. Pyridinocalix[4]arene showed a high extraction ability and selectivity for silver ions. The extraction performance of the calix[4]arene was greatly enhanced by dissolution in RTILs compared to in chloroform. In a competitive extraction test using five different metal ions (Ag+, Cu2+, Zn2+, Co2+, Ni2+), only silver ions were transferred by the calix[4]arene from the aqueous feed phase into the RTILs, through a cation-exchange mechanism. The pyridinocalix[4]arene was found to form a stable 1:1 complex with silver ions, both by slope analysis and by Job's method. Since it is easy to strip silver ions from RTILs by controlling the aqueous-phase pH, the extraction performance of calix[4]arene in RTILs was maintained after five repeated uses.
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Citations
Cited by
Use of ionic liquids as ‘green’ solvents for extractions
Zhao, H., Xia, S., & Ma, P. (2005) · Journal of Chemical Technology & Biotechnology · doi:10.1002/jctb.1333 · Cited by 873
Analytical applications of room-temperature ionic liquids: A review of recent efforts
Pandey, S. (2006) · Analytica Chimica Acta · doi:10.1016/j.aca.2005.06.038 · Cited by 756
Ionic liquids in analytical chemistry
Sun, P., & Armstrong, D. W. (2010) · Analytica Chimica Acta · doi:10.1016/j.aca.2009.12.007 · Cited by 727
Application of ionic liquids in analytical chemistry
Liu, J.-F., Jiang, G.-B., Liu, J.-F., & Jönsson, J. Å. (2005) · TrAC Trends in Analytical Chemistry · doi:10.1016/j.trac.2004.09.005 · Cited by 600
Ionic Liquids as Extraction Solvents: Where do We Stand?
Dietz, M. L. (2006) · Separation Science and Technology · doi:10.1080/01496390600743144 · Cited by 390
Metadata
- Authors
- Shimojo, K., & Goto, M.
- Venue
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-07-10
- Volume
- 76
- Issue
- 17
- Pages
- 5039-5044
- ISSN
- 0003-2700 (ISSN-L)
- 1520-6882
- OpenAlex
- W2040615561
- Cited by
- 242
- References
- 0
- FWCI
- 11.72
- Type
- journal article
- Language
- en
- Open access
- closed
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- Shimojo, K., & Goto, M. (2004). Solvent Extraction and Stripping of Silver Ions in Room-Temperature Ionic Liquids Containing Calixarenes. Analytical Chemistry. https://doi.org/10.1021/ac049549x
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