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

Abstract

Binding equilibria of a water-soluble chelating polymer, poly(acrylic acid), with divalent metal ions [Co(II), Ni(II), Cu(II), Zn(II), and Pb(II)] were measured by a batch ultrafiltration method in the pH range of 4-6. It was shown that the binding equilibrium curves were reasonably well represented by a complexation model accounting for the formation of three kinds of complexes [LM + , L 2 M, and L 2 M(HL) 2 ]. 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 average coordination number was discussed on the basis of the complexation model proposed.

Supercapacitor behavior of CuO–PAA hybrid films: Effect of PAA concentration

“…(2CuO) surface + 2H + + 2e − (Cu 2 O(OH)) surface (10) To evaluate the effect of scan rate (rate capability) on supercapacitor, the CVs at different scan rate were recorded and are shown in Fig. 7(a)-(c) for CP 0.6 , CP 1.4 and CP 2 films.…”

“…On the basis of modification of Bjerrum model [10], the successive formation of PAA-Cu complexes for divalent Cu 2+ ions is expressed as follows:…”

Effect of polymer nature and hydrodynamic conditions on a process of polymer enhanced ultrafiltration

“…They all must get together the majority of the following characteristics: water-solubility, appropriate molecular weight, high affinity to target metal ion, null affinity to nontarget compounds, possibility of regeneration, chemical and mechanical stability, low toxicity and low cost [8,9,18]. …”

“…[9][10][11][12], a great quantity of papers prefer an analytical approach when explaining different affinities of these polymers with metal ions, to the detriment of searching for a technological development of this binding phenomenon.…”

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.…”