NOvel Fission Product Separation Based on Room-Temperature Ionic liquids
- University of Mississippi, University, MS
The effective extraction of Cs+ and Sr2+ into a relatively new and heretofore untested hydrophobic ionic liquid, tri-n-butylmethylammonium bis[(trifluoromethyl)sulfonyl]imide was demonstrated with calix[4]arene-bis(tert-octylbenzo-crown-6) and dicyclohexano-18-crown-6, respectively. The coordinated Cs+ and Sr2+ were subsequently removed from the ionic liquid extraction solvent by an electrochemical reduction process carried out at mercury electrodes. This process is non-destructive, permitting the ionic liquid and ionophores to be recycled. Although the process is based on mercury electrodes, this is a benefit rather than a detriment because the liquid mercury containing the Cs and Sr can be easily transported to another electrochemical cell where the Cs and Sr could be electrochemically recovered from the mercury amalgam and concentrated into a minimum volume of water or some other inexpensive solvent. This should facilitate the development of a suitable waste form for the extracted Cs+ and Sr2+. Thus, the feasibility of the proposed ionic liquid-based extraction cycle for the removal of 137Cs+ and 90Sr2+ from simulated aqueous tank waste was demonstrated.
- Research Organization:
- University of Mississippi
- Sponsoring Organization:
- USDOE - Office of Environmental Management (EM); US - Atomic Energy Commission
- DOE Contract Number:
- FG07-01ER63286
- OSTI ID:
- 859442
- Report Number(s):
- DOE/ER/63286
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
54 ENVIRONMENTAL SCIENCES
ELECTROCHEMICAL CELLS
ELECTRODES
FISSION PRODUCTS
MERCURY
MERCURY ALLOYS
REMOVAL
SOLVENTS
TANKS
WASTE FORMS
WASTES
WATER
calix[4]arene-bis(tert-octylbenzo-crown-6)
cesium
dicyclohexano-18-crown-6
electrochemistry
ionic liquids
mercury electrodes
strontium
tank waste
tri-n-butylmethylammonium bis[(trifluoromethyl)sulfonyl]imide