Metal ion binding properties of synthetic vinyl resins

Abstract

The synthesis of a water-insoluble chelating resin was carried out by radical copolymerization of 4-vinylpyridine and N-hydroxymethyl acrylamide with subsequent crosslinking. Both the crosslinked reference homopolymers of 4-vinylpyridine and Nhydroxymethyl acrylamide were also synthesized. The resins were characterized by elemental analyses and FT-IR spectroscopy. The ability of these resins to bind copper(II), iron(II), iron(II1) and uranyl ions as well as the elution of the metal ions from the loaded resins were studied. For uranyl ions, pH 1 was the optimum sorption pH value for all the resins. Sorption selectivity from the binary mixture Cu(I1) + U(V1) was studied at the optimum sorption pH value. Finally, the uranium(V1) sorption isotherms, binding constants, and AGO, AHo and A S o corresponding to the uranium(V1) sorption process were calculated. ZUSAMMENFASSUNG:Ein wasserunllisliches chelatisierendes Polymerharz wurde durch radikalische Copolymerisation von 4-Vinylpyridin und N-Hydroxymethylacrylamid und anschliefiende Vernetzung hergestellt. Die beiden ebenfalls vernetzten Homopolymeren von 4-Vinylpyridin bzw. N-Hydroxymethylacrylamid wurden ebenfalls synthetisiert. Die Polymeren wurden mittels Elementaranalyse und FT-IR Spektroskopie charakterisiert. Die Adsorptionseigenschaften dieser Harze fur Cu(I1)-, Fe(I1)-, Fe(II1)-und U(V1)-Ionen und die Elution dieser Metallionen von den beladenen Harzen wurde untersucht. Der optimale pH-Wert fur die Aufnahme von Uranylionen liegt bei 1. Bei diesem pH-Wert wurde die Selektivitat der Harze fur die Aufnahme der Ionen aus der binaren Mischung Cu(II)/U(VI) untersucht. Fur die Sorption von Uranylionen wurden die Adsorptionsisothermen, die Bindungskonstanten sowie AG '-, AH 'und AS '-Werte bestimmt.

Degraded Pet for the Removal of Metal Ions From Aqueous Solution

“…The results show lower removal concentrations for Ni(II), Cu(II), and Cr(III), since these ions are easily complexed with hydroxyl ions(OH -) this species decrease their retention onto degraded PET. Additionally, charge and size of each formed species play an important role due to the competence for heteroatoms between all the metal species in solution 2,5 . Degraded PET preferentially removes Pb(II) and Cd(II) showing the following order of retention at pH 4 and 5: Pb(II)>Cd(II)>Ni(II)>Cu(II)>Cr(I II), these results coincide with other reports, attributing this order to factors like complexation abilities, which can be explained by hard and soft acids and bases (pH 5, 25°C).…”

Removal of Hg(II) from acid aqueous solutions by poly(N-vinylimidazole) hydrogel

“…Indeed, only nonprotonated imidazole groups are expected to be involved in Hg(II) complexation and, thus, q should be substituted by q/(1Ϫ␣) in eqs. (2) to (4). The binding constants at initial pH ϭ 1, obtained with this correction, decreases in almost fourfold with respect to those obtained with the same correction for the hydrogel protonated in less than 10% (see Table II, initial pH ϭ 2).…”

Arsenic Sorption Using Mixtures of Ion Exchange Resins Containing N-Methyl-D-Glucamine and Quaternary Ammonium Groups

“…A number of these studies have developed sorption processes including adsorption and ion-exchange mechanisms, precipitation, solvent extraction, conjunction of membranes and polymers using simple materials such as activated carbon or more sophisticated materials such as especially tailored polymers as well as biosorbents, such as fungal or bacterial biomass, and materials of biological origin, including alginate and chitosan [2][3][4][5][6][7][8][9][10][11][12][13][14] .…”