Completely water insoluble resins containing different ligand groups were synthesized by radical polymerization in solution. The yield was higher than 78%. The resins were characterized by FT‐IR spectroscopy and thermal analysis. The retention properties at different pH were investigated by a batch method. Metal ions studied were: Cu(II), Cd(II), Zn(II), Hg(II), Pb(II), Cr(III), and U(VI). The retention properties were also tested under competitive conditions and were found to depend strongly on the pH. Elution of the metal ions was investigated in acid and basic media.

ABSTRACT:The ability of poly(N-vinylimidazole) hydrogels to bind Cu(II), Co(II), Ni(II), Zn(II), Cd(II), Pb(II), Hg(II), Na(I) and Ca(II) cations, as well as uranyl, vanadium, rhenium, and molybdenum complexes, was studied by a batch equilibrium procedure using atomic absorption spectroscopy and UV-Vis spectrophotometry. The optimum pH for ion adsorption was determined in any case. The influence of the crosslinking degree of the hydrogel on the sorption kinetics and the sorption capacity at equilibrium were also studied. Sorption from the binary mixture Cu(II) / U(VI) was also analyzed at the optimum pH. Elution of the ions adsorbed from single and binary solutions was achieved in all cases. A selective desorption of loaded hydrogels with two types of ions was attained. The general conclusion is that poly( N-vinylimidazole) hydrogels are excellent materials for retention of all the ions studied here [except for Pb(II), Na(I), and Ca(II)]. The elution, which can be selective, allows regeneration of the hydrogel.

No abstract

ABSTRACT:The binding ability of poly(4-vinylpyridine) hydrochloride resin for Cu(II), Cd(II), Zn(II), Hg(II), Pb(II), Cr(III), and U(VI) was investigated. All these ions, except Hg(II), could be not removed from aqueous solutions under the same conditions. The selective sorption of Hg(II) from mixtures of ions was observed. The elution of Hg(II) bound to the resin was also investigated using various concentrations of nitric acid and perchloric acid. Due to rapid complexation, a high mercury ion-binding capacity, high selectivity, and ease of regenerability, the resin can be useful for the removal and recovery of mercury ions from aqueous solutions.

SYNOPSISThe synthesis of a water-insoluble metal ion complexing resin was carried out by radical polymerization of 2,2-bis(acrylamido) acetic acid. The resin was characterized by elemental analyses, FTIR spectroscopy, and thermal analyses. The ability to bind copper(II), iron(II), iron(III), and uranium(V1) as well as the elution of the metal ions from the loaded resins were studied. For uranyl ions, pH 5 was the optimum sorption pH value. Sorption selectivity from the binary mixture Cu(I1) + U(V1) was studied at pH 2. The thermal stability is increased by adsorption of TJO;+. According to these results a coordination mechanism is suggested for sorption of copper and uranium. 0 1995 John Wiley & Sons, Inc.

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.

No abstract

ABSTRACT:The poly(styrene-co-divinylbenzene) amine functionalized weak resin was studied as adsorbent of heavy metal ions from an aqueous solution by using the Batch equilibrium procedure. The resin adsorbed Hg(II) 56% (0.56 mEq/g) at pH 2, and 45% (1.13 mEq/g) of U(VI), 38% (0.36 mEq/g) of Pb(II) at pH 5 from an aqueous solution containing 1 g/L of each metal ion. It did not adsorb Cd(II), Zn(II). The equilibrium time was achieved during the first hour. The maximum load capacity for Hg(II) was 0.8 mEq/g (75 mg)/g dry resin. It is possible to recover around 60% of the resin after the treatment with 1-4 M HClO 4 and HNO 3 of the loaded Hg(II) resin.