Equilibrium model for ligand-modified micellar-enhanced ultrafiltration using a water-insoluble ligand

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00038a016· OSTI ID:5717192

Dharmawardana, U R; Christian, S D; Taylor, R W; Scamehorn, J F ^[1]

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1. Univ. of Oklahoma, Norman, OK (United States)

The semiequilibrium dialysis method has been used to investigate the ionic equilibria occurring in a ligand-modified micellar-enhanced ultrafiltration (LM-MEUF) process. With attachment of a C[sub 12]-hydrocarbon group to an iminodiacetic acid group and incorporation of this ligand in a cationic micelle, it is possible to bind Cu[sup 2+] selectively to the ligand in the retentate and expel Ca[sup 2+] into the permeate. An ion equilibrium model has been developed to predict the concentrations of the divalent ions in the permeate from known concentrations in the retentate and known experimental parameters, including the binding constants of the divalent metal ion/ligand complexes. In contrast with other micellar-enhanced ultrafiltration processes, addition of salt increases the retention of the bound metal ion. The model explains both the enhanced retention of Cu[sup 2+] and variations in the extent of expulsion of Ca[sup 2+] caused by changing the added salt concentration. 25 refs., 4 figs., 2 tabs.

• DOE Contract Number: FG05-87ER13678
• OSTI ID: 5717192
• Journal Information: Langmuir; (United States), Journal Name: Langmuir; (United States) Vol. 8:2; ISSN LANGD5; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400105* -- Separation Procedures
400201 -- Chemical & Physicochemical Properties
CALCIUM IONS
CHARGED PARTICLES
COLLOIDS
COPPER IONS
DATA
DIALYSIS
DISPERSIONS
EVALUATION
EXPERIMENTAL DATA
FILTRATION
INFORMATION
IONS
LIGANDS
MICELLAR SYSTEMS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
SEPARATION PROCESSES
SPECTROPHOTOMETRY
ULTRAFILTRATION