Metal (II) ion binding onto chelating exchangers with nitrogen donor atoms: Some new observations and related implications
- Lehigh Univ., Bethelehem, PA (USA)
Chelating exchangers with only nitrogen donor atoms exhibit some unusual properties in relation to metal ion uptake from the aqueous phase. Specifically, for these chelating exchangers, (a) the metal ion uptake increases with an increase in competing Ca{sup 2+} and Na{sup +} ion concentrations; (b) metal removal capacities remain almost unaffected at pH as low as 1.0; (c) regeneration or desorption of metal ions with ammonia is very efficient while acid regeneration is ineffective; and (d) both metal cations and other anions can be removed simultaneously from the aqueous phase. The foregoing behaviors are not observed at all for other commonly used chelating exchangers with carboxylate, iminodiacetate, or aminophosphonate functionalities. A molar-exchange model, where the individual nitrogen donor atoms bind metal ions independently on molar basis, can explain the anomalous characteristics of these specialty chelating exchangers. Because of their unusual properties, these chelating exchangers with only nitrogen donor atoms offer new application opportunities for heavy-metals removal unattainable through other exchangers.
- OSTI ID:
- 5615214
- Journal Information:
- Environmental Science and Technology; (USA), Journal Name: Environmental Science and Technology; (USA) Vol. 25:3; ISSN ESTHA; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
ALKALI METALS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
CALCIUM
CALCULATION METHODS
CHELATING AGENTS
CHEMICAL PROPERTIES
DATA ANALYSIS
DISPERSIONS
ELEMENTS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
METALS
MIXTURES
SODIUM
SOLUTIONS