Ionic covalent organic nanosheet (iCON)–quaternized polybenzimidazole nanocomposite anion-exchange membranes to enhance the performance of membrane capacitive deionization
نویسندگان
چکیده
Membrane capacitive deionization (MCDI) is a promising technique to achieve desalination of low-salinity water resources. The primary requirements for developing and designing materials MCDI applications are large surface area, high wettability water, conductivity, efficient ion-transport pathways. Herein, we synthesized ionic covalent organic nanosheets (iCONs) containing guanidinium units that carry positive charge. A series quaternized polybenzimidazole (QPBI)/iCON ([email protected]) nanocomposite membranes was fabricated using solution casting. surface, thermal, wettability, electrochemical properties the [email protected] were evaluated. anion-exchange achieved salt adsorption capacity as 15.6 mg g−1 charge efficiency up 90%, which 50% 20% higher than those pristine QPBI membrane, respectively. performance improvement attributed increased ion-exchange (2.4 mmol g−1), reduced area resistance (5.4 Ω cm2), enhanced hydrophilicity (water uptake = 32%) membranes. This due additional quaternary ammonium groups conductive ion transport networks donated by iCON materials. excellent demonstrated their potential use in alternative electromembrane processes.
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ژورنال
عنوان ژورنال: Desalination
سال: 2022
ISSN: ['1873-4464', '0011-9164']
DOI: https://doi.org/10.1016/j.desal.2022.115777