Modification of Nafion Membranes by Polycation in the Presence of Lower Alyphatic Alcohols and Salt

Significant increase of ion selectivity has been observed for Nafion membranes modified by poly(diallyldimethylammonium chloride) (PDADMAC) in the presence of lower aliphatic alcohols and NaCl. It has been found that addition of the salt into the alcohol-containing modification solutions results not...

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Bibliographic Details
Published inMembranes and Membrane Technologies Vol. 5; no. 3; pp. 168 - 177
Main Authors Zakharova, Yu. A., Sergeyev, V. G.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.06.2023
Subjects
Catalysis
Chemistry
Chemistry and Materials Science
Electrochemistry
Nanotechnology
Polymer Sciences
Surfaces and Interfaces
Thin Films
Water Quality/Water Pollution
ion selectivity
membrane
Nafion
Bradford reagent
PDADMAC
diffusion permeability
isopropyl alcohol
proton conductivity
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Summary:Significant increase of ion selectivity has been observed for Nafion membranes modified by poly(diallyldimethylammonium chloride) (PDADMAC) in the presence of lower aliphatic alcohols and NaCl. It has been found that addition of the salt into the alcohol-containing modification solutions results not only in decrease of diffusional permeability towards vanadyl ions P but also in simultaneous two- to threefold growth of proton conductivity σ in comparison with the membranes modified in the alcohol-water solutions in the absence of the salt. As a result, ion selectivity of the membranes calculated as σ/ P ratio has been increased in ∼4 orders of magnitude as compared with pristine Nafion 112 membrane. Conceivable mechanism of the ion selectivity increasing is proposed for the membranes modified by PDADMAC in the presence of lower aliphatic alcohols and NaCl.
ISSN:2517-7516
2517-7524
DOI:10.1134/S2517751623030095