Ligand-modified polyelectrolyte-enhanced ultrafiltration with electrostatic attachment of ligands. 2. Use of diethylenetriaminepentaacetic acid/cationic polyelectrolyte mixtures to remove both cations and anions from aqueous streams

Journal Article · Thu Dec 01 00:00:00 EST 1994 · Langmuir; (United States)

DOI:https://doi.org/10.1021/la00024a050· OSTI ID:6619218

Tuncay, M ^[1]; Christian, S D; Tucker, E E; Taylor, R W; Scamehorn, J F ^[2]

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

A mixture of a cationic polyelectrolyte, poly(diallyldimethylammonium chloride) or PDADMAC, and the anionic ligand diethylenetriaminepentaacetic acid (DTPA) can be added to aqueous streams as a water-soluble colloid to bind simultaneously divalent cations, such as Cu[sup 2+] and Pb[sup 2+], and anions, such as CrO[sub 4][sup 2[minus]]. At pH values greater than about 4, most of DTPA is attached electrostatically to the PDADMAC, so that the ligand remains in the retentate in ultrafiltration (UF) separations. Equilibrium dialysis studies show the effectiveness of the PDADMAC-DTPA mixture in binding ions of various types; the data also show that cations such as Ca[sup 2+], which do not bind to the ligand, are expelled and become concentrated in the permeate solution passing through the membrane. In equilibrium dialysis and UF experiments, with the PDADMAC-DTPA mixture added to a feed stream containing a mixture of Cu[sup 2+] and CrO[sub 4][sup 2[minus]], the bound cations and anions become highly concentrated in the retentate solution. 10 refs., 5 figs., 5 tabs.

• OSTI ID: 6619218
• Journal Information: Langmuir; (United States), Vol. 10:12; ISSN 0743-7463
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
WASTE WATER
ULTRAFILTRATION
AQUEOUS SOLUTIONS
CHROMATES
COLLOIDS
COMPILED DATA
COPPER IONS
DIALYSIS
ELECTROLYTES
ELECTROSTATICS
LEAD IONS
LIGANDS
ORGANIC POLYMERS
PH VALUE
SODIUM CHLORIDES
ALKALI METAL COMPOUNDS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM COMPOUNDS
DATA
DISPERSIONS
FILTRATION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
IONS
LIQUID WASTES
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
WASTES
WATER
400105* - Separation Procedures
400201 - Chemical & Physicochemical Properties