Binding Properties of a Water-Soluble Chelating Polymer with Divalent Metal Ions Measured by Ultrafiltration. Poly(α-acethylaminoacrylic acid)

Abstract

Binding equilibria of a water-soluble chelating polymer, poly(R-acethylaminoacrylic acid), with divalent metal ions (Co(II), Ni(II), Cu(II), Zn(II), Pb(II)) were measured by a batch ultrafiltration method in the pH range 4-6. It was shown that the binding equilibrium curves were reasonably well represented by the complexation model accounting for the formation of three kinds of complexes (LM + , L 2 M, and L 2 M(HL) 2 ) proposed previously. The equilibrium and successive stability constants were determined by fitting the binding curves calculated from the model to the experimental ones at every solution pH. The variations of the average coordination number depending on solution pH and metal ion concentration were well explained on the basis of the relative concentration of each complex to total polymer.

Preparation and characterization of N-methylene phosphonic and quaternized chitosan composite membranes for electrolyte separations

“…Separation of Ca 2+ and Mg 2+ from Na + is also a serious problem for the removal of hardness from ground water, boiler feed water, production of pure salt, etc. Many technologies such as ion-exchange resin [1], chelation of bivalent ions [2,3], ultrafiltration or nanofiltration [4,5], and electrodialysis [6,7] have been used by different scientists to solve this problem. But the use of hazardous chemicals and solvents during the preparation of membranes or resins is a serious problem.…”

Polyelectrolyte Functionalisation of Track Etched Membranes: Towards Charge-Tuneable Adsorber Materials

“…Typically, PDha is prepared from the precursor poly( tert -butoxycarbonylaminomethyl acrylate) (P t BAMA) [ 14 , 16 ], but it is also accessible via the free radical polymerisation of N -acetyl dehydroalanine (NADha) in aqueous solutions [ 19 ]. In addition to being polymerisable in water, PNADha has been shown to be complex and adsorb heavy metal ions even without deprotection [ 20 , 21 ].…”

Effects of operating parameters on efficiency of lead removal by complexation-microfiltration process

“…Katsoufidou et al [6] investigated removal of divalent metal ions such as calcium (II) with alginate. Kawano et al [7] studied binding equilibria of poly(α--acethylaminoacrilic acid) with divalent ions. Kim and Lim [8] investigated removal of heavy metal ions from water by cross-linked carboxymethyl cornstarch; lead, cadmium and mercury ions in water were almost completely removed; copper concentration was reduced.…”