Specific ion effects on the permselectivity of sulfonated poly(ether sulfone) cation exchange membranes

Harrison J. Cassady, Emily C. Cimino, Manish Kumar, Michael Anthony Hickner

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Water uptake and permselectivity were measured for five sulfonated poly(ether sulfone) cation exchange membranes with varying degrees of functionalization from 20% to 60%. Experiments were conducted in aqueous salt solutions of LiCl, NaCl, KCl, Li2SO4, Na2SO4 and K2SO4 to isolate the effect of counter-ions and co-ions on membrane permselectivity. Water uptake ranged from 0.13gwater/gpolymer to 0.76gwater/gpolymer depending on the degree of functionalization and salt used, but was not found to describe the permselectivity differences between salts as the counter-ion and co-ion were varied. This lack of correlation between water uptake and permselectivity is counter to expectations for swollen polymers. Counter-ion binding affinity, charge density and dilute solution mobility were identified as factors influencing membrane permselectivity. Specifically, counter-ions with higher binding affinities to the fixed charge group of the polymer showed lower permselectivities due to counter-ion condensation. Co-ion polarizability was identified as the primary factor for co-ion effects on permselectivity, with more polarizable co-ions resulting in lower membrane permselectivities.

Original languageEnglish (US)
Pages (from-to)146-152
Number of pages7
JournalJournal of Membrane Science
Volume508
DOIs
StatePublished - Jun 15 2016

Fingerprint

Sulfones
sulfones
Radiation counters
Ether
Cations
Ethers
ethers
Ion exchange
Positive ions
Ions
membranes
Membranes
cations
counters
Salts
ions
Water
Polymers
salts
Charge density

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

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title = "Specific ion effects on the permselectivity of sulfonated poly(ether sulfone) cation exchange membranes",
abstract = "Water uptake and permselectivity were measured for five sulfonated poly(ether sulfone) cation exchange membranes with varying degrees of functionalization from 20{\%} to 60{\%}. Experiments were conducted in aqueous salt solutions of LiCl, NaCl, KCl, Li2SO4, Na2SO4 and K2SO4 to isolate the effect of counter-ions and co-ions on membrane permselectivity. Water uptake ranged from 0.13gwater/gpolymer to 0.76gwater/gpolymer depending on the degree of functionalization and salt used, but was not found to describe the permselectivity differences between salts as the counter-ion and co-ion were varied. This lack of correlation between water uptake and permselectivity is counter to expectations for swollen polymers. Counter-ion binding affinity, charge density and dilute solution mobility were identified as factors influencing membrane permselectivity. Specifically, counter-ions with higher binding affinities to the fixed charge group of the polymer showed lower permselectivities due to counter-ion condensation. Co-ion polarizability was identified as the primary factor for co-ion effects on permselectivity, with more polarizable co-ions resulting in lower membrane permselectivities.",
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Specific ion effects on the permselectivity of sulfonated poly(ether sulfone) cation exchange membranes. / Cassady, Harrison J.; Cimino, Emily C.; Kumar, Manish; Hickner, Michael Anthony.

In: Journal of Membrane Science, Vol. 508, 15.06.2016, p. 146-152.

Research output: Contribution to journalArticle

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AU - Cimino, Emily C.

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AU - Hickner, Michael Anthony

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AB - Water uptake and permselectivity were measured for five sulfonated poly(ether sulfone) cation exchange membranes with varying degrees of functionalization from 20% to 60%. Experiments were conducted in aqueous salt solutions of LiCl, NaCl, KCl, Li2SO4, Na2SO4 and K2SO4 to isolate the effect of counter-ions and co-ions on membrane permselectivity. Water uptake ranged from 0.13gwater/gpolymer to 0.76gwater/gpolymer depending on the degree of functionalization and salt used, but was not found to describe the permselectivity differences between salts as the counter-ion and co-ion were varied. This lack of correlation between water uptake and permselectivity is counter to expectations for swollen polymers. Counter-ion binding affinity, charge density and dilute solution mobility were identified as factors influencing membrane permselectivity. Specifically, counter-ions with higher binding affinities to the fixed charge group of the polymer showed lower permselectivities due to counter-ion condensation. Co-ion polarizability was identified as the primary factor for co-ion effects on permselectivity, with more polarizable co-ions resulting in lower membrane permselectivities.

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