The crosslinked poly[N-(3-dimethylamino)-propylmethacrylamide] [P(NDAPA)] and poly [N-(3-dimethylamino)propylmethacrylamide-co-acrylic acid] [P(NDA-PA-co-AA)] were synthesized by radical polymerization. The resins were completely insoluble in water. The metalion-uptake properties were studied by a 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). The P(NDAPA-co-AA) resin showed a lower metal-ion affinity than P(NDAPA), except for Hg(II), which was retained at 71% at pH 2. At pH 5, the resin showed a higher affinity for Pb(II) (80%) and Cu(II) (60%), but its affinity was very low for Zn(II) and Cr(III). The polymer ligand-metal-ion equilibrium was achieved during the first 20 min. By changing the pH, we found it possible to remove between 60 and 70% of Cd(II) and Zn(II) ions with (1M, 4M) HClO 4 and (1M, 4M) HNO 3 .
Crosslinked poly(acryloylmorpholine) and its copolymers poly(acryloyl morpholine-co-acrylic acid) and poly(acryloylmorpholine-co-2-acrylamide-2-methyl-1-propane sulfonic acid) were synthesized by radical polymerization. The resins were completely insoluble in water and were characterized with Fourier transform infrared spectroscopy and thermal analysis. The metal ions Ag(I), Cu(II), Cd(II), Hg(II), Zn(II), Pb(II), Al(III), and Cr(III) were investigated under competitive and noncompetitive conditions by a batch equilibrium procedure. The resin-metal-ion equilibrium was achieved before 5 min. The recovery of the resin was investigated at 20°C with different concentrations of HNO 3 and HClO 4 .
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