REMOVAL OF METAL IONS WITH IMPACT ON THE ENVIRONMENT BY WATER-INSOLUBLE FUNCTIONAL COPOLYMERS: SYNTHESIS AND METAL ION UPTAKE PROPERTIES

Abstract

The crosslinked resins poly(4-acryloylmorpholine-co-4-vinyl pyridine) P(AMo- VPy), poly(N-(3-dimethylamino)propylmethacrylamide-co-4-vinyl pyridine) P(NDAPA-VPy), and poly((3-dimethylamino)propylacrylate-co-4-vinyl pyridine) P(DAPA-VPy) were obtained by radical polymerization. The resins were completely insoluble in water. The uptake metal ion properties are studied by batch equilibrium procedure for the following metal ions: silver(I), copper(II), cadmium(II), zinc(II), lead(II), mercury(II), chromium(III), and aluminum(III). P(AMo-VPy) resin shows a lower metal ion affinity than P(DAPA-VPy), except for Hg(II) which is retained in almost 100 % at pH 2. At pH 5, the resin shows the higher affinity for Ag(I) (80%) and Cu(II) (60%) but it is very low for Zn(II) and Cr(III). The polymer ligand metal ion equilibrium is achieved during the first 20 min. By changing the pH is possible to remove between 50 % and 70 % of Cd(II) and Cu(II) ions by using (1 M, 4 M) HClO4 and (1 M, 4 M) HNO3