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Physicochemical investigation of radiation‐grafted poly(acrylic acid)‐ graft ‐poly(tetrafluoroethylene–ethylene) copolymer membranes and their use in metal recovery from aqueous solution
Author(s) -
ElSawy Naeem M.,
Al Sagheer Fakhreia A.
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.10685
Subject(s) - membrane , copolymer , acrylic acid , aqueous solution , tetrafluoroethylene , polymer chemistry , metal ions in aqueous solution , adsorption , grafting , ion exchange , materials science , chemistry , chemical engineering , nuclear chemistry , metal , ion , polymer , organic chemistry , biochemistry , engineering
ET‐ g ‐PAAc membranes were obtained by radiation grafting of acrylic acid onto poly(tetrafluoroethylene–ethylene) copolymer films using a mutual technique. The ion selectivity of the grafted membranes was determined toward K + , Ag + , Hg 2+ , Co 2+ , and Cu 2+ in a mixed aqueous solution. The ion‐exchange capacity of the grafted membranes was measured by back titration and atomic absorption spectroscopy. The Hg 2+ ion content of the membrane was more than that of either the K + or Ag + ions. The presence of metal ions in the membranes was studied by infrared and energy‐dispersive spectroscopy measurements. Scanning electron microscopy of the grafted and metal‐treated grafted membranes showed modification of the morphology of the surface due to the adsorption of K + and Ag + ions. No change was observed for the surface of the membrane that was treated with Hg 2+ ions. The thermal stability of different membranes was improved more with Ag + and Hg 2+ ions than with K + ions. It was found that the modified grafted membranes possessed good hydrophilicity, which may make them promising candidates for practical applications, such as for cation‐exchange membranes in the recovery of metals from an aqueous solution. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2692–2698, 2002