Ionic covalent organic nanosheet (iCON)–quaternized polybenzimidazole nanocomposite anion-exchange membranes to enhance the performance of membrane capacitive deionization

McNair, Robert; Kumar, Sushil; Wonanke, A. D. Dinga; Addicoat, Matthew A.; Dryfe, Robert A. W.; Székely, György

doi:10.1016/j.desal.2022.115777

Cited by 12 publications

(5 citation statements)

References 46 publications

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“…[116] McNair et al have demonstrated a strategy in which guanidinium-based ionic covalent organic nanosheets (iCONs) were loaded in the matrix of quarternized polybenzimidazole (QPBI) polymer to prepare iCON@QPBI AEM for mCDI (Figure 8). [118] The iCON@-QPBI AEM exhibits a SAC value of 15.6 mg g À 1 (50 % higher than pristine QPBI) and a charge efficiency of 90 % (20 % higher than pristine QPBI). The presence of additional quarternized ammonium groups improves the hydro-philicity of the AEM.…”

Section: Cofs-based Iems Materialsmentioning

confidence: 97%

Electrode Materials for Desalination of Water via Capacitive Deionization

et al. 2023

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Recent years have seen the emergence of capacitive deionization (CDI) as a promising desalination technique for converting sea and wastewater into potable water, due to its energy efficiency and eco‐friendly nature. However, its low salt removal capacity and parasitic reactions have limited its effectiveness. As a result, the development of porous carbon nanomaterials as electrode materials have been explored, while taking into account of material characteristics such as morphology, wettability, high conductivity, chemical robustness, cyclic stability, specific surface area, and ease of production. To tackle the parasitic reaction issue, membrane capacitive deionization (mCDI) was proposed which utilizes ion‐exchange membranes coupled to the electrode. Fabrication techniques along with the experimental parameters used to evaluate the desalination performance of different materials are discussed in this review to provide an overview of improvements made for CDI and mCDI desalination purposes

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Section: Cofs-based Iems Materialsmentioning

confidence: 97%

Electrode Materials for Desalination of Water via Capacitive Deionization

et al. 2023

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“…Szekely and co-workers integrated guanidinium-based ionic covalent organic nanosheets (iCONs) into quarternized polybenzimidazole (QPBI) polymer matrix to fabricate an iCON@-QPBI MMMs. [50] In the first step, a DMAc solution of iCONs (10 wt%) was sonicated to prepare a finely dispersed solution, which was then mixed with QPBI through mechanical stirring. The resultant composite solution was knife-cast onto a glass plate, dried, and precipitated in water to form the iCON@QPBI MMMs (Figure 4).…”

Section: Fabrication Of Cof Mixed Matrix Membranesmentioning

confidence: 99%

“… Schematic of the preparation of both the ionic covalent organic nanosheet (iCON) materials and nanocomposite membranes. Reproduced from ref [50] . Copyright (2022), with permission from Elsevier.…”

Section: Fundamentals Of Cof Composite Membranesmentioning

confidence: 99%

Covalent Organic Framework‐derived Composite Membranes for Water Treatment

Elmerhi,

Kumar,

Abi Jaoude

et al. 2023

Chemistry An Asian Journal

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Water treatment has experienced a surge in the adoption of membrane separation technology. Covalent organic frameworks (COFs), a class of metal‐free and open‐framework materials, have emerged as potential membrane materials owing to their interconnected periodic porosity, tunability, and chemical stability. However, the challenges associated with processing COF powders into self‐standing membranes have spurred the emergence of COF composite membranes. This review article highlights the rationale behind developing COF composite membranes and their categories, including mixed matrix membranes (MMMs) and thin film composite (TFC) membranes. The common fabrication techniques of each category are presented. In addition, the influence of COF additives on the performance of the resultant composite membranes is systematically discussed, with a focus on the recent progress in applying COF composite membranes in the separation of different categories of water pollutants, including organic ions/molecules, toxic solvents, proteins, toxic heavy metals, and radionuclides.

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“…The PBI family is characterized by high glass transition temperatures, often exceeding 450 °C [ 8 , 9 ], good mechanical properties, and excellent chemical stability which, on the whole, is the main reason to use them as materials for extreme conditions [ 9 , 10 ]. PBI polymer has a wide range of applications: for the manufacture of capacitive deionization anion exchange membranes [ 11 , 12 ], for the production of high chemical resistance in various organic solvents membranes for nanofiltration with good separation performance [ 13 ], and as a component for the production of proton-conducting membranes [ 14 ]. The most common and commercially available PBI (Celazole ® ) is synthesized from the expensive and carcinogenic 3,3′-diaminobenzidine and isophthalic acid diphenyl ester [ 2 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…Until now, the production of fibers and films from a high molecular weight ABPBI was carried out from acid solutions with concentrations lower than 5.5% [ 6 , 7 ]. The processing was limited by the fact that the ABPBI spinning solution dopes were based on such aggressive solvents as methanesulfonic acid [ 6 , 18 ], polyphosphoric acid (PPA), or a mixture of P 2 O 5 with methanesulfonic acid (Eaton’s reagent) [ 11 , 19 ]. A low molecular weight ABPBI ( M ꞷ ≤ 50−60 kg∙mol −1 ) can be dissolved in sulfuric acid [ 8 ], trifluoroacetic acid [ 19 ], methanesulfonic acid [ 8 ], formic acid [ 8 ], N-methyl-2-pyrrolidone (NMP)/LiCl [ 20 ] and ethanol/NaOH mixtures [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology

et al. 2022

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AB-polybenzimidazole (ABPBI) dissolution kinetics in an eco-friendly complex acid-free solvent based on dimethyl sulfoxide (DMSO), methanol and KOH, and the rheological behavior of their solutions are investigated. The optimal component ratio of solvent providing the complete ABPBI dissolution is determined. Methanol containing dissolved KOH contributes to the creation of a single-phase superbasic medium, which accelerates and improves the polymer solubility in a mixture with DMSO, significantly reducing the viscoelasticity of the resulting solution. The optimum methanol content is up to 60 wt.% related to DMSO. The polymer dissolution rate increases by 5 times in this composition. It found the polymer concentration of 9% is close to the dissolution limit due to the strong solution structuring, which is probably associated with an increase in the amount of water released during the KOH-methanol-DMSO interactions. As a result, the conditions for obtaining high concentrated solutions in a complex, mainly organic solvent for fiber spinning are developed. The viscoelastic properties of solutions are measured in the concentration range of 1–9% at temperatures of 20–50 °C. The flow activation energy for 7 and 9% solutions decreases by 1.5 and 2.3 times, respectively, as the content of methanol in the complex solvent increases from 10 to 60%.

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Ionic covalent organic nanosheet (iCON)–quaternized polybenzimidazole nanocomposite anion-exchange membranes to enhance the performance of membrane capacitive deionization

Cited by 12 publications

References 46 publications

Electrode Materials for Desalination of Water via Capacitive Deionization

Electrode Materials for Desalination of Water via Capacitive Deionization

Covalent Organic Framework‐derived Composite Membranes for Water Treatment

High Molecular Weight AB-Polybenzimidazole and Its Solutions in a Complex Organic Solvent: Dissolution Kinetics and Rheology

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