Metal ion separations using hydrophobic anions: Aspects of ligand design
- Los Alamos National Lab., NM (United States)
- Colorado State Univ., Fort Collins, CO (United States)
Metal ion extraction using hydrophobic anions has been investigated by several researchers for remediation of Cs-137 and Sr-90 in nuclear waste. The rich derivative chemistry of the cobalt bis-dicarbollide anion makes it amendable to systematic studies of the relative importance of anion structure, solvent, and synergists on the extraction selectivity and efficiency. Halogenation or alkylation of cobalt dicarbollide strongly influences the anion`s solubility and stability but has little effect on extraction properties. Alkali metal selectivity depends primarily on solvent, while alkaline earth selectivity is driven by the concentration and molecular weight of polyethylene glycol synergists. Additional aspects of ligand design, including a simple extraction and recovery cycle based on redox-active metal centers, will be discussed.
- OSTI ID:
- 560084
- Report Number(s):
- CONF-970443--
- Country of Publication:
- United States
- Language:
- English
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