Potential uses of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste
- IBC Advanced Technologies, Inc., Provo, UT (United States)
- Pacific Northwest Lab., Richland, WA (United States)
This paper explores the potential of a relatively new separation material that is obtained by covalently binding macrocyclic ligands to silica gel. Fortunately, neutral macrocyclic ligands can be bound to silica gel such that metal binding constants do not differ significantly from the binding constants of the free ligands so that selectivities of free macrocyclic ligands can be used in designing silica-bound materials with appropriate selectivities. Accordingly, macrocyclic ligands known to have selectivities for Pd{sup +2}, Ag{sup +}, Ru{sup +3}, Sr{sup +2}, and Cs{sup +} were covalently bound to silica gel. These materials were then tested for their ability to separate these ions from a synthetic test solution representative of a nuclear process waste stream. Cs{sup +} and Sr{sup +2} are of interest because their radioactive isotopes are major radioactive constituents of defense nuclear wastes accumulated at the Hanford site. Removal of precious metals such as Pd{sup +2}, Ag{sup +} and Ru{sup +3} present in nuclear defense waste are of interest not just because of their obvious economic value, but also because these metals may hinder the waste vitrification process for confining radionuclides.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 10114820
- Report Number(s):
- PNL-SA-20054; CONF-911133-10; ON: DE92006469
- Resource Relation:
- Conference: American Institute of Chemical Engineers (AIChE) annual meeting,Los Angeles, CA (United States),17-22 Nov 1991; Other Information: PBD: Nov 1991
- Country of Publication:
- United States
- Language:
- English
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Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste. [Macrocyclic ligands covalently bonded to silica gel]
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