A. Denizli et al., Synthesis and adsorption properties of poly(2-hydroxyethylmethacrylate-co-methacrylamidophenylalanine) membranes for copper ions, REACT FUNCT, 46(2), 2000, pp. 157-164
In the first step of this study, the metal complexing ligand, 2-methacrylam
idophenylalanine (MAPA), was synthesized by using methacrylochloride and ph
enylalanine. The MAPA monomer was characterized by NMR. Then, poly(2-hydrox
yethylmethacrylate -co-2-methacrylamidophenylalanine) [p(HEMA-co-MAPA)] mem
branes were prepared by UV-initiated photo-polymerization of HEMA and MAPA
in the presence of an initiator (azobisisobutyronitrile? AIBN). p(HEMA-co-M
APA) membranes were characterized by FTIR and elemental analysis. These p(H
EMA-co-MAPA) affinity membranes with a swelling ratio of 133.2%, and contai
ning 18.9 mmol MAPA/m(2), were used in the adsorprion-desorption of copper(
II) ions from synthetic solutions. Adsorption equilibria was reached in abo
ut 2 h. The maximum adsorption of Cu(II) ions onto pHEMA was about 0.54 mmo
l Cu(II)/m(2). The MAPA incorporation significantly increased the Cu(II) ad
sorption capacity by chelate formation of Cu(II) ions with MAPA molecules (
23.8 mmol Cu(II)/m(2)), which was observed at pH 7.0. The chelating membran
e can be easily regenerated by 0.1 M HNO3 with higher effectiveness. (C) 20
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