Thin and robust organic solvent cation exchange membranes for ion separation

Zhao, Yan; Li, Yi; Zhu, Jiajie; Lejarazu-Larrañaga, Amaia; Yuan, Shushan; Ortega, E.; Shen, Jiangnan; Gao, Congjie; Bruggen, Bart Van der

doi:10.1039/c9ta03550h

Cited by 32 publications

(22 citation statements)

References 47 publications

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“…Generally, three typical characteristic regions, (1) the ohmic region, (2) the limiting current region, and (3) the over-limiting region, are displayed in the C-V curves. 50,51 The cross-linked membranes were tested and, as expected, showed better electrodialysis performance (CAPSF-100, CAPAF-80) compared with APSF and the commercial AEM (Neosepta AMX). As shown in Fig.…”

Section: Alkaline Stabilitymentioning

confidence: 55%

A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

et al. 2019

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Novel anion exchange membranes with enhanced ion exchange capacity, dimensional stability and alkali stability were prepared by a facile synthesis method. Internal crosslinking networks in the resulting membranes were achieved by reacting chloromethylated polysulfone with 4,4 0 -trimethylene bis(1methylpiperidine) (BMP), where BMP was used as both a quaternization reagent and crosslinker without requirement of post-functionalization. In order to evaluate the alkali resistance and dimension stability performance of the resulting membranes, the molar ratio of BMP in the resulting membranes was fixed at four different contents: 40%, 60%, 80% and 100%. The obtained membranes were accordingly denoted as CAPSF-N, in which N ¼ 40, 60, 80 and 100, respectively. Due to the dense internal network structure and spatial conformation of the six-membered rings, the resulting CAPSF-N AEMs showed enhanced dimensional structures (at 60 C, the water uptakes and swelling ratios of CAPSF-N were 8.42% to 14.84% and 2.32% to 5.93%, respectively, whereas those for the commercial AEM Neosepta AMX were 44.23% and 4.22%, respectively). In addition, after soaking in 1 M KOH solution at 60 C for 15 days, the modified membranes exhibited excellent alkaline stability. The CAPSF-100 membrane showed the highest alkali stability (retained 85% of its original ion exchange capacity and 84% of its original OH À conduction after the alkaline stability test), whereas the non-crosslinked APSF broke into pieces.Additionally, compared to the commercial Neosepta AMX membrane under the same test conditions, the desalination efficiency of CAPSF-100 was enhanced, and the energy consumption was lower.Polysulfone (M w $ 35 000 g mol À1 ) and 4,4 0 -trimethylene bis(1methylpiperidine) (99%) were bought from Sigma-Aldrich, China. PSF was dried at 80 C in vacuum before use. This journal isScheme 1 Preparation of cross-linked CAPSF and APSF membranes.This journal is Fig. 6 In ED process: (a) limited current density test: C-V curves of CAPSF-100, CAPSF-80, APSF, and commercial AEMs; (b) change of potential over stack with different AEMs; (c) conductivity change in concentrate/dilute chamber.Fig. 7 (a) NaCl removal ratio, (b) current efficiency and energy consumption after 2.5 h in ED.36382 | RSC Adv., 2019,9,[36374][36375][36376][36377][36378][36379][36380][36381][36382][36383][36384][36385] This journal is

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Section: Alkaline Stabilitymentioning

confidence: 55%

A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

et al. 2019

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“…While most applications of ED occur in aqueous media, more attention is being given to organic media as well [264]. Zhao et al expanded the development of ED membranes to the treatment of waste organic streams [239,240,244,246]. Their ED membranes are based on poly (paraphenylene terephthalamide) nanofibers, which are characterized by their organic solvent resistance, high strength and outstanding thermal stability.…”

Section: Desalination Of Brackish Watermentioning

confidence: 99%

A review on ion-exchange nanofiber membranes: properties, structure and application in electrochemical (waste)water treatment

Swanckaert

Geltmeyer

Rabaey

et al. 2022

Separation and Purification Technology

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“…Commercial ion exchange membranes have been utilized for promotion of ion diffusion in membrane contactors . However, there is no long‐term stability evidence using ion exchange membranes for extraction purposes, although solvent resistance has been significantly improved . Song et al .…”

Section: Introductionmentioning

confidence: 99%

“…6,43,44 However, there is no long-term stability evidence using ion exchange membranes for extraction purposes, although solvent resistance has been significantly improved. 45,46 Song et al reported using sulfonated polyether ether ketone (SPEEK)/polyethersulfone (PES) blend membranes for lithium extraction 18 and separation of copper and nickel, 47 but with limited stability. Membranes made from ethylene vinyl alcohol (EVAL) have both hydrophobic solvent-resistant and hydrophilic ion permeable units, conferring solvent resistance.…”

Section: Introductionmentioning

confidence: 99%

Increasing lithium extraction performance by adding sulfonated poly (ether ether ketone) into block‐copolymer ethylene vinyl alcohol membrane

Chunfeng

Song

Huang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND High efficiency membrane extraction (ME) of lithium from brine has been constrained by membrane mass transfer resistance. We report here a new solvent‐resistant membrane produced from ethylene vinyl alcohol (EVAL) and sulfonated polyether ether ketone (SPEEK). RESULTS The effect of the SPEEK on the thermodynamics and kinetics of demixing to the membrane morphology was investigated systematically. Addition SPEEK created extra resistance to the movement of the polymer chains in solution which was reflected in the reduced gelation diffusion coefficient. About 0.5 wt% of SPEEK was sufficient to reduce the mass transfer resistance of lithium ions (Li+). Membrane thickness showed linear correlation with Li+ flux, but was limited by its weak mechanical strength. Finally, a composite EVAL/SPEEK membrane supported by a thin loose nonwoven fabric showed a stress of 12.5 MPa, nearly 10‐fold greater than the unsupported membrane, and the highest lithium extraction flux of 4.80 × 10−8 mol cm−2 s−1. CONCLUSION The work provides a rationale for developing mechanically stable, high extraction flux membranes for ME. © 2020 Society of Chemical Industry

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Thin and robust organic solvent cation exchange membranes for ion separation

Cited by 32 publications

References 47 publications

A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

A review on ion-exchange nanofiber membranes: properties, structure and application in electrochemical (waste)water treatment

Increasing lithium extraction performance by adding sulfonated poly (ether ether ketone) into block‐copolymer ethylene vinyl alcohol membrane

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