Adsorption of UO22+ by polyethylene adsorbents with amidoxime, carboxyl, and amidoxime/carboxyl group

The polyethylene (PE) adsorbents were prepared by a radiation-induced graft ing of acrylonitrile (AN), acrylic acid (AA), and the mixture of AN/AA onto PE film, and by subsequent amidoximation of cyano groups of poly-AN graft chains. With an increase of AA composition in AN/AA monomer mixture, the wa ter uptake of the grafted polyethylene film increased. In AN/AA mixture, th e maximum adsorption of UO22+ was observed in the adsorbent with a ratio of AN/AA (50/50, mol%) in copolymer. The amidoxime, carboxyl, and amidoxime/c arboxyl groups onto PE acted as a chelating site for the selected UO22+. Th e complex structure of polyethylene with three functional groups and UO22was confirmed by Fourier Transform Infrared (FTIR) spectroscopy. (C) 2000 E lsevier Science Ltd. All rights reserved.