Organic solvent resistant Kevlar nanofiber-based cation exchange membranes for electrodialysis applications

Shen, Pengxin; Liao, Junbin; Chen, Quan; Ruan, Hao; Shen, Jiangnan

doi:10.1016/j.memsci.2021.119300

Cited by 16 publications

(10 citation statements)

References 50 publications

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“…For applications such as dialysis membranes and BPMs, a hot-pressing process is necessary to obtain dense membranes [ 31 ]. In addition, the KANF-based IEMs are usually prepared by casting Kevlar NF solutions, which are obtained by dissolution of Kevlar aramid fiber [ 32 , 33 , 34 ]. The dense NF composite membranes are usually prepared by casting polymer solutions on NF networks, followed by a drying process [ 35 ].…”

Section: Fundamental Aspects and Production Methods Of Ion-exchange Nanofibersmentioning

confidence: 99%

“…The prepared CEMs showed a high IEC of up to 2.23 mmol·g −1 with a low surface area resistance of 2.40 Ω·cm 2 . Moreover, ED with an optimized membrane composition revealed high desalination efficiency and concentration efficiency in organic solvents [ 33 ]. Zhao et al designed a CEM by interpenetrating networks of PSSMA into KANFs, followed by functionalization with 4-amino-2,2,6,6-tetramethylpiperidine-1-oxyl.…”

Section: Applications Of Nanofiber-based Iemsmentioning

confidence: 99%

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De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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The unique functions of nanofibers (NFs) are based on their nanoscale cross-section, high specific surface area, and high molecular orientation, and/or their confined polymer chains inside the fibers. The introduction of ion-exchange (IEX) groups on the surface and/or inside the NFs provides de novo ion-exchangers. In particular, the combination of large surface areas and ionizable groups in the IEX-NFs improves their performance through indices such as extremely rapid ion-exchange kinetics and high ion-exchange capacities. In reality, the membranes based on ion-exchange NFs exhibit superior properties such as high catalytic efficiency, high ion-exchange and adsorption capacities, and high ionic conductivities. The present review highlights the fundamental aspects of IEX-NFs (i.e., their unique size-dependent properties), scalable production methods, and the recent advancements in their applications in catalysis, separation/adsorption processes, and fuel cells, as well as the future perspectives and endeavors of NF-based IEMs.

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Section: Fundamental Aspects and Production Methods Of Ion-exchange Nanofibersmentioning

confidence: 99%

Section: Applications Of Nanofiber-based Iemsmentioning

confidence: 99%

De Novo Ion-Exchange Membranes Based on Nanofibers

2021

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“…The increase in mechanical strength indicates that PEI could strengthen the cross-linked structure of the membrane through the amide reaction. Compared with the most reported work with the values in the range of 15–30 MPa, the mechanical strength of the as-prepared CEM herein shows much higher values. , This relatively high tensile strength indicates that CEM has sufficient strength and sufficient flexibility to be used in the ED process.…”

Section: Resultsmentioning

confidence: 46%

“…Herein, the tensile strengths of Kevlar, PP-K-0.5, PP-K-1.0, and PP-K-5.0 CEM in the hydrated state were tested at room temperature. In Figure b, we can see that the as-prepared CEM shows a tensile strength of 62.17–142.23 MPa, which is higher than the tensile strength in the previous work . The strength has increased by 20–50 MPa.…”

Section: Resultsmentioning

confidence: 63%

“…11 Shen et al grafted sulfonate to Kevlar nanofiber membranes through the amide reaction to prepare CEM that is resistant to organic solvents. 15 As for the application of separation and purification of different organic solvents, Li et al have prepared a series of modification measures on the Kevlar nanofiber membrane; the as-prepared IEM exhibits the high performance of efficiently separating organic solvents. 5 It can be known that the amide bond can enhance the organic solvent resistance of the membrane.…”

Section: Introductionmentioning

confidence: 99%

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Organic Solvent-Resistant and Robust Kevlar Nanofiber-Based Cation-Exchange Membranes for Improved Electrodialysis Performance

Dong

et al. 2022

ACS Appl. Polym. Mater.

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With the increasingly serious pollution of organic solvents, the development of durable resistance of organic solvents and robust ion-exchange membranes is of great significance for specific electrodialysis processes. In this work, a series of resistant organic solvent cation-exchange membranes (CEMs) have been prepared by using small and short Kevlar nanofibers modified with the poly(4-styrene sulfonic acid-co-maleic acid) sodium salt and polyethyleneimine via amide condensation. The investigation demonstrates that the as-prepared Kevlar nanofiber-based CEM (PP-K-5.0 CEM) exhibits a high tensile strength of 142.23 MPa and good electrochemical performance. To evaluate the stability of the desalination performance of the prepared CEM in the organic solvent, the CEM was immersed in acetone and ethanol aqueous solutions at room temperature for 7 d. As for the evaluation of CEM performance, electrodialysis with treated CEM (PP-K-5.0 CEM) can achieve high desalination efficiencies (84.5% in 90% ethanol solution and 85.4% in 90% acetone solution) and concentration efficiencies (90.7% in 90% ethanol solution and 87.5% in 90% acetone solution), respectively. The results indicate that this work could provide a design route for preparing robust CEMs, which is potentially applied in desalination systems containing organic solvents.

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Self‐Supporting Electrocatalyst Film Based on Self‐Assembly of Heterogeneous Bottlebrush and Polyoxometalate for Efficient Hydrogen Evolution Reaction

Lin

Zhu

et al. 2022

Macromol. Rapid Commun.

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Developing efficient electrocatalysts to promote the hydrogen evolution reaction (HER) is essential for a green and sustainable future energy supply. For practical applications, it is a challenge to achieve the self‐assembly of electrocatalyst from microscopic to macroscopic scales. Herein, a facile strategy is proposed to fabricate a self‐supporting electrocatalyst film (CNT‐g‐PSSCo/PW12) for HER by electrostatic interaction‐induced self‐assembly of cobalt polystyrene sulfonate‐grafted carbon nanotube heterogeneous bottlebrush (CNT‐g‐PSSCo) and polyoxometalate (PW12). Co2+ ions of CNT‐g‐PSSCo can function as junctions for interconnecting neighboring bottlebrushes to form the 3D nanonetwork structure and enable electrostatic capture of negatively charged PW12 nanodots. Moreover, CNT backbones can provide highly conductive pathways to CNT‐g‐PSSCo/PW12. Such a self‐assembled CNT‐g‐PSSCo/PW12 displays a low overpotential of 31 mV at a current density of 10 mA cm−2 and a small Tafel slope of 25 mV dec−1, showing high efficiency toward HER. Furthermore, CNT‐g‐PSSCo/PW12 with a stable self‐supporting film morphology exhibits long‐term electrocatalytic stability over 1000 CV cycles without noticeable overpotential change in acidic media. The findings may provide a new avenue for constructing self‐assembled functional nanonetwork materials with well‐orchestrated structural hierarchy for many applications in energy, environment, catalysis, medicine, and others.

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Organic solvent resistant Kevlar nanofiber-based cation exchange membranes for electrodialysis applications

Cited by 16 publications

References 50 publications

De Novo Ion-Exchange Membranes Based on Nanofibers

De Novo Ion-Exchange Membranes Based on Nanofibers

Organic Solvent-Resistant and Robust Kevlar Nanofiber-Based Cation-Exchange Membranes for Improved Electrodialysis Performance

Self‐Supporting Electrocatalyst Film Based on Self‐Assembly of Heterogeneous Bottlebrush and Polyoxometalate for Efficient Hydrogen Evolution Reaction

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