An NMR study on the adsorption of a metal chelating agent at a micelle/water interface
- Univ. of Melbourne, Parkville (Australia)
- Univ. of South Australia, The Levels (Australia)
The complexation of aqueous Zn[sup 2+] with a solvent extraction chelate, 7-(4-ethyl-1-methyloctyl)-8-hydroxyquinoline (K7HQ), in micellar solutions of n-dodecyloctaoxyethylene glycol monoether (C[sub 12]E[sub 8]) has been examined using an NMR technique. The ring resonance effect of the aromatic moiety of the K7HQ molecule has been used to determine the loci of solubilization of the free ligand and the metal complex in the host micelle. It has been found that the free ligand resides preferentially at the micelle core/water interface whereas the metal complex favors the more hydrophobic regions of the micelle core. The effect of pH on the loci of solubilization of the free ligand has also been studied. At low pH (1.4) the ligand carries a positive charge and its distribution is biased more to the micelle core/water interface than at higher pH (6), where it exists as a neutral zwitterionic species. The relevance of the micellar results to the extraction of metal ions from an aqueous phase into an organic phase are discussed.
- OSTI ID:
- 6592409
- Journal Information:
- Journal of Colloid and Interface Science; (United States), Vol. 157:1; ISSN 0021-9797
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
EXTRACTION
ZINC
ADSORPTION
CHELATES
INTERFACES
MICELLAR SYSTEMS
NUCLEAR MAGNETIC RESONANCE
PH VALUE
WASTE WATER
WATER
WATER TREATMENT
COMPLEXES
ELEMENTS
HYDROGEN COMPOUNDS
LIQUID WASTES
MAGNETIC RESONANCE
OXYGEN COMPOUNDS
RESONANCE
SEPARATION PROCESSES
SORPTION
WASTES
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
400105 - Separation Procedures