Desalination by electrodialysis with the ion-exchange membrane prepared by radiation-induced graft polymerization

Seong Ho Choi, Young Han Jeong, Jae Jeong Ryoo, Kwang Pill Lee

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Ion-exchange membranes modified with the triethylamine [-N(CH2CH3)3] and phosphoric acid (-PO3H) groups were prepared by radiation-induced grafting of glycidyl methacrylate (GMA) onto the polyolefin nonwavon fabric (PNF) and subsequent chemical modification of poly(GMA) graft chains. The physical and chemical properties of the GMA-grafted PNF and the PNF modified with ion-exchange groups were investigated by SEM, XPS, TGA, and DSC. Furthermore, electrochemical properties such as specific electric resistance, transport number of K+, and desalination were examined. The grafting yield increased with increasing reaction time and reaction temperature. The maximum grafting yield was obtained with 40% (vol.%) monomer concentration in dioxane at 60°C. The content of the cation- and anion-exchange group increased with increasing grafting yield. Electrical resistance of the PNF modified with TEA and -PO3H group decreased, while the water uptake (%) increased with increasing ion-exchange group capacities. Transport number of the PNF modified with ion-exchange group were the range of ca. 0.82-0.92. The graft-type ion-exchange membranes prepared by radiation-induced graft copolymerization were successfully applied as separators for electrodialysis.

Original languageEnglish
Pages (from-to)503-511
Number of pages9
JournalRadiation Physics and Chemistry
Volume60
Issue number4-5
DOIs
StatePublished - 2001

Keywords

  • Amination
  • Desalination
  • Glycidyl methacrylate
  • Ion-exchange membrane
  • Phosphonation
  • Radiation-induced graft polymerization
  • Specific electrical resistance
  • Transport number

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