Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite

Farzaneh Radmanesh, Timon Rijnaarts, Ahmad Moheb, Morteza Sadeghi, Wiebe M. De Vos

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

Novel heterogeneous cation exchange membranes, based on poly (ether sulfone) and cation exchange resin, were prepared with the addition of protonated and sulfonated Montmorillonite (MMT) nanoparticles. Detailed investigations were then carried out studying the morphology, physical properties and the performance of membranes. It is observed that addition of MMT, leads to a substantially better distribution of ion exchange resin in the polymer matrix. This leads, at low loadings of MMT (0.5 wt%), to membranes that are more hydrated, more hydrophilic and with higher ion exchange capacities. Especially at these low MMT loadings, substantially better membrane performance is observed, with higher permselectivities, lower areal resistances and increased ion transport during electrodialysis. A very surprising effect is that the addition of MMT has a strong effect on the selectivity of the membranes, especially towards Mg2+. A high affinity of the nanoclay towards Mg2+, selectively slows down Mg2+ transport through the nanoclay containing membrane. At low MMT loadings this leads to a much higher areal resistance for Mg2+, while for Na+ and Ca2+ the areal resistance is decreased. This leads to resistance based selectivities of 5.5 for Na+/Mg2+ and 4.5 for Ca2+/Mg2+ . Under more challenging electrodialysis operation selectivities become lower, but persist at 2.6 for Na+/Mg2+ and 2.04 for Ca2+/Mg2+, outperforming commercial Ralex membranes. Overall, the protonated clay leads to slightly better membrane performances and selectivities than the sulfonated clay, likely due to a better compatibility with PES.
Original languageEnglish
Pages (from-to)658-670
Number of pages13
JournalJournal of colloid and interface science
Volume533
Early online date29 Aug 2018
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

Bentonite
Clay minerals
Cations
Ion exchange
Positive ions
Membranes
Electrodialysis
Clay
Cation Exchange Resins
Ion Exchange Resins
Sulfones
Ion exchange resins
Polymer matrix
Ether
Ethers
Resins
Physical properties
Ions
Nanoparticles

Keywords

  • Cation exchange membrane
  • Electrodialysis
  • Heterogeneous
  • Ion selective
  • Montmorillonite

Cite this

@article{49bd0449a4f444dda9784e79acf8fba4,
title = "Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite",
abstract = "Novel heterogeneous cation exchange membranes, based on poly (ether sulfone) and cation exchange resin, were prepared with the addition of protonated and sulfonated Montmorillonite (MMT) nanoparticles. Detailed investigations were then carried out studying the morphology, physical properties and the performance of membranes. It is observed that addition of MMT, leads to a substantially better distribution of ion exchange resin in the polymer matrix. This leads, at low loadings of MMT (0.5 wt{\%}), to membranes that are more hydrated, more hydrophilic and with higher ion exchange capacities. Especially at these low MMT loadings, substantially better membrane performance is observed, with higher permselectivities, lower areal resistances and increased ion transport during electrodialysis. A very surprising effect is that the addition of MMT has a strong effect on the selectivity of the membranes, especially towards Mg2+. A high affinity of the nanoclay towards Mg2+, selectively slows down Mg2+ transport through the nanoclay containing membrane. At low MMT loadings this leads to a much higher areal resistance for Mg2+, while for Na+ and Ca2+ the areal resistance is decreased. This leads to resistance based selectivities of 5.5 for Na+/Mg2+ and 4.5 for Ca2+/Mg2+ . Under more challenging electrodialysis operation selectivities become lower, but persist at 2.6 for Na+/Mg2+ and 2.04 for Ca2+/Mg2+, outperforming commercial Ralex membranes. Overall, the protonated clay leads to slightly better membrane performances and selectivities than the sulfonated clay, likely due to a better compatibility with PES.",
keywords = "Cation exchange membrane, Electrodialysis, Heterogeneous, Ion selective, Montmorillonite",
author = "Farzaneh Radmanesh and Timon Rijnaarts and Ahmad Moheb and Morteza Sadeghi and {De Vos}, {Wiebe M.}",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.jcis.2018.08.100",
language = "English",
volume = "533",
pages = "658--670",
journal = "Journal of colloid and interface science",
issn = "0021-9797",
publisher = "Academic Press Inc.",

}

Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite. / Radmanesh, Farzaneh; Rijnaarts, Timon; Moheb, Ahmad; Sadeghi, Morteza; De Vos, Wiebe M.

In: Journal of colloid and interface science, Vol. 533, 01.01.2019, p. 658-670.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite

AU - Radmanesh, Farzaneh

AU - Rijnaarts, Timon

AU - Moheb, Ahmad

AU - Sadeghi, Morteza

AU - De Vos, Wiebe M.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Novel heterogeneous cation exchange membranes, based on poly (ether sulfone) and cation exchange resin, were prepared with the addition of protonated and sulfonated Montmorillonite (MMT) nanoparticles. Detailed investigations were then carried out studying the morphology, physical properties and the performance of membranes. It is observed that addition of MMT, leads to a substantially better distribution of ion exchange resin in the polymer matrix. This leads, at low loadings of MMT (0.5 wt%), to membranes that are more hydrated, more hydrophilic and with higher ion exchange capacities. Especially at these low MMT loadings, substantially better membrane performance is observed, with higher permselectivities, lower areal resistances and increased ion transport during electrodialysis. A very surprising effect is that the addition of MMT has a strong effect on the selectivity of the membranes, especially towards Mg2+. A high affinity of the nanoclay towards Mg2+, selectively slows down Mg2+ transport through the nanoclay containing membrane. At low MMT loadings this leads to a much higher areal resistance for Mg2+, while for Na+ and Ca2+ the areal resistance is decreased. This leads to resistance based selectivities of 5.5 for Na+/Mg2+ and 4.5 for Ca2+/Mg2+ . Under more challenging electrodialysis operation selectivities become lower, but persist at 2.6 for Na+/Mg2+ and 2.04 for Ca2+/Mg2+, outperforming commercial Ralex membranes. Overall, the protonated clay leads to slightly better membrane performances and selectivities than the sulfonated clay, likely due to a better compatibility with PES.

AB - Novel heterogeneous cation exchange membranes, based on poly (ether sulfone) and cation exchange resin, were prepared with the addition of protonated and sulfonated Montmorillonite (MMT) nanoparticles. Detailed investigations were then carried out studying the morphology, physical properties and the performance of membranes. It is observed that addition of MMT, leads to a substantially better distribution of ion exchange resin in the polymer matrix. This leads, at low loadings of MMT (0.5 wt%), to membranes that are more hydrated, more hydrophilic and with higher ion exchange capacities. Especially at these low MMT loadings, substantially better membrane performance is observed, with higher permselectivities, lower areal resistances and increased ion transport during electrodialysis. A very surprising effect is that the addition of MMT has a strong effect on the selectivity of the membranes, especially towards Mg2+. A high affinity of the nanoclay towards Mg2+, selectively slows down Mg2+ transport through the nanoclay containing membrane. At low MMT loadings this leads to a much higher areal resistance for Mg2+, while for Na+ and Ca2+ the areal resistance is decreased. This leads to resistance based selectivities of 5.5 for Na+/Mg2+ and 4.5 for Ca2+/Mg2+ . Under more challenging electrodialysis operation selectivities become lower, but persist at 2.6 for Na+/Mg2+ and 2.04 for Ca2+/Mg2+, outperforming commercial Ralex membranes. Overall, the protonated clay leads to slightly better membrane performances and selectivities than the sulfonated clay, likely due to a better compatibility with PES.

KW - Cation exchange membrane

KW - Electrodialysis

KW - Heterogeneous

KW - Ion selective

KW - Montmorillonite

UR - http://www.scopus.com/inward/record.url?scp=85052886423&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2018.08.100

DO - 10.1016/j.jcis.2018.08.100

M3 - Article

VL - 533

SP - 658

EP - 670

JO - Journal of colloid and interface science

JF - Journal of colloid and interface science

SN - 0021-9797

ER -