Sulfate Separation from Aqueous Alkaline Solutions by Selective Crystallization of Alkali Metal Coordination Capsules
- Oak Ridge National Laboratory (ORNL)
- ORNL
Self-assembly of a tris(urea) anion receptor with Na{sub 2}SO{sub 4} or K{sub 2}SO{sub 4} yields crystalline capsules held together by coordinating Na{sup +} or K{sup +} cations and hydrogen-bonding water bridges, with the sulfate anions encapsulated inside urea-lined cavities. The sodium-based capsules can be selectively crystallized in excellent yield from highly competitive aqueous alkaline solutions ({approx}6 M Na{sup +}, pH 14), thereby providing for the first time a viable approach to sulfate separation from nuclear wastes.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- EM USDOE - Environmental Restoration and Waste Management (EM)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 1027827
- Journal Information:
- Crystal Growth & Design, Vol. 11, Issue 7; ISSN 1528-7483
- Country of Publication:
- United States
- Language:
- English
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