Mass transfer in Nation membrane systems: Effects of ionic size and charge on selectivity

T. Xue, R. B. Longwell, Kwadwo Asare Osseo-Asare

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The interdiffusion of metal ion-hydrogen ion couples in Nation membrane systems has been measured by a rotating diffusion cell (RDC) technique. At low metal concentrations, the transport rate is controlled by boundary layer diffusion and the metal flux follows the order Li+ < Na+ < K+ < Rb+ < Cs+ for alkali metals, and Ca2+ < Sr2+< Ba2+ for alkaline earth metals. At high metal concentrations, the transport process is controlled by membrane diffusion and the order of the flux is Li+ <Cs+ <Rb+ <Na+ <K+ for alkali metals, Ca2+<Ba2+<Sr2+ for alkali earth metals, and Y+ <Ca2+ < Na+ for ions of similar ionic size (0.93-0.99 Å) but different charge. The results are interpreted in terms of ionic hydration coupled with charge and size effects.

Original languageEnglish (US)
Pages (from-to)175-189
Number of pages15
JournalJournal of Membrane Science
Volume58
Issue number2
DOIs
StatePublished - May 15 1991

Fingerprint

Alkali Metals
mass transfer
Mass transfer
selectivity
Metals
membranes
Membranes
Alkali metals
metals
alkali metals
Alkaline Earth Metals
Ions
Fluxes
Alkaline earth metals
alkaline earth metals
Alkalies
hydrogen ions
Hydration
Metal ions
hydration

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "The interdiffusion of metal ion-hydrogen ion couples in Nation membrane systems has been measured by a rotating diffusion cell (RDC) technique. At low metal concentrations, the transport rate is controlled by boundary layer diffusion and the metal flux follows the order Li+ < Na+ < K+ < Rb+ < Cs+ for alkali metals, and Ca2+ < Sr2+< Ba2+ for alkaline earth metals. At high metal concentrations, the transport process is controlled by membrane diffusion and the order of the flux is Li+ <Cs+ <Rb+ <Na+ <K+ for alkali metals, Ca2+<Ba2+<Sr2+ for alkali earth metals, and Y+ <Ca2+ < Na+ for ions of similar ionic size (0.93-0.99 {\AA}) but different charge. The results are interpreted in terms of ionic hydration coupled with charge and size effects.",
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Mass transfer in Nation membrane systems : Effects of ionic size and charge on selectivity. / Xue, T.; Longwell, R. B.; Osseo-Asare, Kwadwo Asare.

In: Journal of Membrane Science, Vol. 58, No. 2, 15.05.1991, p. 175-189.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mass transfer in Nation membrane systems

T2 - Effects of ionic size and charge on selectivity

AU - Xue, T.

AU - Longwell, R. B.

AU - Osseo-Asare, Kwadwo Asare

PY - 1991/5/15

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AB - The interdiffusion of metal ion-hydrogen ion couples in Nation membrane systems has been measured by a rotating diffusion cell (RDC) technique. At low metal concentrations, the transport rate is controlled by boundary layer diffusion and the metal flux follows the order Li+ < Na+ < K+ < Rb+ < Cs+ for alkali metals, and Ca2+ < Sr2+< Ba2+ for alkaline earth metals. At high metal concentrations, the transport process is controlled by membrane diffusion and the order of the flux is Li+ <Cs+ <Rb+ <Na+ <K+ for alkali metals, Ca2+<Ba2+<Sr2+ for alkali earth metals, and Y+ <Ca2+ < Na+ for ions of similar ionic size (0.93-0.99 Å) but different charge. The results are interpreted in terms of ionic hydration coupled with charge and size effects.

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