{"title":"Modification of Nafion Membranes by Polycation in the Presence of Lower Alyphatic Alcohols and Salt","authors":"Yu. A. Zakharova, V. G. Sergeyev","doi":"10.1134/S2517751623030095","DOIUrl":null,"url":null,"abstract":"<p>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 <i>P</i> 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/<i>P</i> 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.</p>","PeriodicalId":700,"journal":{"name":"Membranes and Membrane Technologies","volume":"5 3","pages":"168 - 177"},"PeriodicalIF":2.0000,"publicationDate":"2023-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Membranes and Membrane Technologies","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1134/S2517751623030095","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
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.
期刊介绍：
The journal Membranes and Membrane Technologies publishes original research articles and reviews devoted to scientific research and technological advancements in the field of membranes and membrane technologies, including the following main topics:novel membrane materials and creation of highly efficient polymeric and inorganic membranes;hybrid membranes, nanocomposites, and nanostructured membranes;aqueous and nonaqueous filtration processes (micro-, ultra-, and nanofiltration; reverse osmosis);gas separation;electromembrane processes and fuel cells;membrane pervaporation and membrane distillation;membrane catalysis and membrane reactors;water desalination and wastewater treatment;hybrid membrane processes;membrane sensors;membrane extraction and membrane emulsification;mathematical simulation of porous structures and membrane separation processes;membrane characterization;membrane technologies in industry (energy, mineral extraction, pharmaceutics and medicine, chemistry and petroleum chemistry, food industry, and others);membranes and protection of environment (“green chemistry”).The journal has been published in Russian already for several years, English translations of the content used to be integrated in the journal Petroleum Chemistry. This journal is a split off with additional topics.
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