BINDING OF URANYL IONS BY WATER-INSOLUBLE POLYMERS CONTAINING MULTILIGAND GROUPS

Abstract

Listen

Translate article

ABSTRACT The crosslinked resins poly(N-(3-dimethylamino)propylmethacrylamide) P(NDAPA), poly((3-dimethylamino)propylacrylate)P(DAPA), poly(4-acryloylmorpholine-co-acrylic acid) P(AMo-AA), poly(N-(3-dimethylamino)propylmethacrylamide-co-4-vinyl pyridine) P(NDAPA-VPy) and poly((3-dimethylamino)propylacrylate-co-acrylic acid) P(DAPA-AA), poly(N-(3-dimethylamino)propylmethacrylamide-co-acrylic acid) P(NDAPA-AA) were obtained by radical polymerization. These resins were completely insoluble in water. The uptake metal ion properties were studied by batch equilibrium procedure for copper(II) and uranyl ions.Keywords: resin; radical polymerization; metal ions; polymer-metal complexesP(AMo-AA): AMo (0.04 mole, 5 mL), AA (0.043 mole, 3 mL), DVB (0.0035 mole, 0.5 mL) and AIBN (0.00039 mole, 0.0651 g) (Merck) in 8 mL of dry toluene. Yield = 95.0 %. P(NDAPA-AA): NDAPA (0.0276 mole, 5 mL), AA (0.029 mole, 2 mL), MBA (0.0021 mole, 0.3461 g) and AP (0.00027 mole, 0.0605 g) in 7 mL of water. Yield = 97.0 %.P(NDAPA-VPy): NDAPA (0.0276 mole, 5 mL), VPy (0.0278 mole, 3 mL), MBA (0.0022 mole, 0.3450 g) and AP (0.00031 mole, 0.0697 g) in 8 mL of water. Yield = 87.0 %. P(DAPA-AA): DAPA (0.0295 mols, 5 mL), AA (0.0292 mole, 2 mL), MBA (0.0023 mole, 0.3659 g) and AP (0.00027 mole, 0.0618 g) in 7 mL of water. Yield = 99.0%. The polymerization mixtures were kept under nitrogen at 70oC for 8 h (see Scheme 1). Then methanol was added and the resin was removed from the flask, filtered and washed with abundant water. The resin was dried under vacuum at 40oC and then milled and sized by screening. The fraction with mesh size in the range of 250-500 mm was chosen.Scheme 1. Synthesis and structure of the resinsResin – metal ion uptakeThe effect of the pH on the metal ion retention properties was studied by batch equilibrium procedure. These batch metal uptake experiments were carried out using the standard metal salts Cu(NO