Separation of silver from other metal cations using pyridone and triazole macrocycles in liquid membrane systems
Selective transport of Ag/sup +/ over other metal ions in competitive experiments in bulk and emulsion liquid membrane systems has been accomplished by using macrocycles of the proton-ionizable pyridone and triazole types. The transport of Ag/sup +/ by the pyridone macrocycles involves the cotransport of an anion, while transport by the triazole macrocycles can involve either co-anion transport or the counter transport of H/sup +/. In particular, the affinity of Ag/sup +/ for the triazole moiety, the excellent fit of Ag/sup +/ into an 18-crown-6 sized cavity, and the presence of only one proton-ionizable site per macrocycle molecule combine to produce highly selective transport of Ag/sup +/ over Pb/sup 2 +/ and Tl/sup +/ with triazolo-18-crown-6 derivatives in membrane systems containing acid receiving phases. Transport of alkali-, alkaline-earth-, and several transition-metal cations is minimal in similar membrane systems and, hence, selective transport of Ag/sup +/ over these cations is also expected.
- Research Organization:
- Brigham Young Univ., Provo, UT (USA)
- DOE Contract Number:
- FG02-86ER13463
- OSTI ID:
- 6743204
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 60:17; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
AZOLES
CATIONS
CHARGED PARTICLES
DATA
EFFICIENCY
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
IONS
KETONES
LIQUIDS
MEMBRANES
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
SEPARATION PROCESSES
SILVER
TRANSITION ELEMENTS