Coating of Nafion membranes with polyelectrolyte multilayers to achieve high monovalent/divalent cation electrodialysis selectivities

ACS Applied Materials & Interfaces
Nicholas WhiteMerlin L Bruening

Abstract

Electrodialysis (ED) membranes typically exhibit modest selectivities between monovalent and divalent ions. This paper reports a dramatic enhancement of the monovalent/divalent cation selectivities of Nafion 115 membranes through coating with multilayer poly(4-styrenesulfonate) (PSS)/protonated poly(allylamine) (PAH) films. Remarkably, K(+)/Mg(2+) ED selectivities reach values >1000, and similar monovalent/divalent cation selectivities occur with feed solutions containing K(+) and Ca(2+). For comparison, the corresponding K(+)/Mg(2+) selectivity of bare Nafion 115 is only 1.8 ± 0.1. However, with 0.01 M KNO3 and 0.01 M Mg(NO3)2 in the source phase, as the applied current density increases from 1.27 to 2.54 mA cm(-2), the K(+)/Mg(2+) selectivities of coated membranes decrease from >1000 to 22. Water-splitting at strongly overlimiting current densities may lead to a local pH increase close to the membrane surface and alter film permeability or allow passage of Mg(OH)x species to decrease selectivity. When the source phase contains 0.1 M KNO3 and 0.1 M Mg(NO3)2, the K(+) transference number approaches unity and the K(+)/Mg(2+) selectivity is >20,000, presumably because the applied current is below the limiting value for K(+) and H...Continue Reading

References

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Citations

Jan 20, 2016·ACS Applied Materials & Interfaces·Peng GaoWilliam A Phillip
Jun 27, 2015·Scientific Reports·Robert FemmerMatthias Wessling
Jul 2, 2016·The Journal of Physical Chemistry. B·Nandita AbhyankarJoseph B Schlenoff
Jan 5, 2018·Nano Convergence·Gyu LeemKirk S Schanze
May 13, 2020·Chemical Communications : Chem Comm·Jin RanTongwen Xu
Aug 6, 2020·International Journal of Molecular Sciences·Irina SteninaAndrey Yaroslavtsev
Nov 2, 2019·Journal of Colloid and Interface Science·Emily N TummonsVolodymyr V Tarabara
Mar 20, 2021·Analytica Chimica Acta·Daniel F Kienle, Daniel K Schwartz
Sep 12, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Andriy YaroshchukMerlin L Bruening
Dec 24, 2018·Environmental Science & Technology·Laura PaltrinieriLouis C P M de Smet
Feb 16, 2019·The Journal of Physical Chemistry Letters·Daniel F Kienle, Daniel K Schwartz

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