Charged polymer membranes for environmental/energy applications

Jovan Kamcev, Benny D. Freeman

Research output: Contribution to journalReview ArticleOtherpeer-review

68 Citations (Scopus)

Abstract

Ion exchange membranes are used in various membrane-based processes (e.g., electrodialysis, fuel cells). Charged solute transport is largely governed by the charged groups on the polymer backbone. In this review, fundamental relationships describing salt permeability and ionic conductivity, as well as water permeability, in charged polymers are developed within the framework of the Nernst-Planck and solution-diffusion models. The influence of fixed charge groups and polymer structure on water sorption and diffusion is discussed. Current understanding of ion partitioning in charged polymers, focusing on the use of thermodynamic models (i.e., Donnan theory) to describe such phenomena, is summarized. Ion diffusivity data from the literature are interpreted using a model developed by Mackie and Meares to assess relative and absolute effects of the polymer and fixed charge groups on ion diffusivity. Furthermore, membrane requirements for several important technologies are listed. Knowledge gaps and opportunities for fundamental research are also discussed.

Original languageEnglish
Pages (from-to)111-133
Number of pages23
JournalAnnual Review of Chemical and Biomolecular Engineering
Volume7
DOIs
Publication statusPublished - 7 Jun 2016
Externally publishedYes

Keywords

  • diffusion
  • Donnan theory
  • ion exchange polymer
  • Meares model
  • sorption
  • transport

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