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PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation

The traditional ion-exchange membranes face the trade-off effect between the ion flux and perm-selectivity, which limits their application for selective ion separation. Herein, we amalgamated various amounts of the ZSM-5 with the polyvinyl alcohol as ions transport pathways to improve the permeabili...

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Autores principales: Sheng, Fangmeng, Afsar, Noor Ul, Zhu, Yanran, Ge, Liang, Xu, Tongwen
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7344570/
https://www.ncbi.nlm.nih.gov/pubmed/32486311
http://dx.doi.org/10.3390/membranes10060114
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author Sheng, Fangmeng
Afsar, Noor Ul
Zhu, Yanran
Ge, Liang
Xu, Tongwen
author_facet Sheng, Fangmeng
Afsar, Noor Ul
Zhu, Yanran
Ge, Liang
Xu, Tongwen
author_sort Sheng, Fangmeng
collection PubMed
description The traditional ion-exchange membranes face the trade-off effect between the ion flux and perm-selectivity, which limits their application for selective ion separation. Herein, we amalgamated various amounts of the ZSM-5 with the polyvinyl alcohol as ions transport pathways to improve the permeability of monovalent cations and exclusively reject the divalent cations. The highest contents of ZSM-5 in the mixed matrix membranes (MMMs) can be extended up to 60 wt% while the MMMs with optimized content (50 wt%) achieved high perm-selectivity of 34.4 and 3.7 for H(+)/Zn(2+) and Li(+)/Mg(2+) systems, respectively. The obtained results are high in comparison with the commercial CSO membrane. The presence of cationic exchange sites in the ZSM-5 initiated the fast transport of proton, while the microporous crystalline morphology restricted the active transport of larger hydrated cations from the solutions. Moreover, the participating sites and porosity of ZSM-5 granted continuous channels for ions electromigration in order to give high limiting current density to the MMMs. The SEM analysis further exhibited that using ZSM-5 as conventional fillers, gave a uniform and homogenous formation to the membranes. However, the optimized amount of fillers and the assortment of a proper dispersion phase are two critical aspects and must be considered to avoid defects and agglomeration of these enhancers during the formation of membranes.
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spelling pubmed-73445702020-07-09 PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation Sheng, Fangmeng Afsar, Noor Ul Zhu, Yanran Ge, Liang Xu, Tongwen Membranes (Basel) Article The traditional ion-exchange membranes face the trade-off effect between the ion flux and perm-selectivity, which limits their application for selective ion separation. Herein, we amalgamated various amounts of the ZSM-5 with the polyvinyl alcohol as ions transport pathways to improve the permeability of monovalent cations and exclusively reject the divalent cations. The highest contents of ZSM-5 in the mixed matrix membranes (MMMs) can be extended up to 60 wt% while the MMMs with optimized content (50 wt%) achieved high perm-selectivity of 34.4 and 3.7 for H(+)/Zn(2+) and Li(+)/Mg(2+) systems, respectively. The obtained results are high in comparison with the commercial CSO membrane. The presence of cationic exchange sites in the ZSM-5 initiated the fast transport of proton, while the microporous crystalline morphology restricted the active transport of larger hydrated cations from the solutions. Moreover, the participating sites and porosity of ZSM-5 granted continuous channels for ions electromigration in order to give high limiting current density to the MMMs. The SEM analysis further exhibited that using ZSM-5 as conventional fillers, gave a uniform and homogenous formation to the membranes. However, the optimized amount of fillers and the assortment of a proper dispersion phase are two critical aspects and must be considered to avoid defects and agglomeration of these enhancers during the formation of membranes. MDPI 2020-05-30 /pmc/articles/PMC7344570/ /pubmed/32486311 http://dx.doi.org/10.3390/membranes10060114 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sheng, Fangmeng
Afsar, Noor Ul
Zhu, Yanran
Ge, Liang
Xu, Tongwen
PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title_full PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title_fullStr PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title_full_unstemmed PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title_short PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation
title_sort pva-based mixed matrix membranes comprising zsm-5 for cations separation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7344570/
https://www.ncbi.nlm.nih.gov/pubmed/32486311
http://dx.doi.org/10.3390/membranes10060114
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