Closed-loop circularity in water remediating membranes enabled by �exchangeable-bonds,� covalent organic framework, and sequential interpenetrating polymeric networks

Sen Gupta, R and Islam, SS and Bose, S (2024) Closed-loop circularity in water remediating membranes enabled by �exchangeable-bonds,� covalent organic framework, and sequential interpenetrating polymeric networks. In: Chemical Engineering Journal, 488 .

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Abstract

Most commercial membranes are characterized by linear lifecycles, leading to landfill disposal, exacerbating microplastic pollution, and undermining membrane sustainability. A scalable approach was devised to create a closed-loop cycle for fouled membranes. This involved introducing 'exchangeable bonds' through covalent conjugation of a robust covalent organic framework (COF, here a Benzidine-based COF) and a mussel-inspired sequential interpenetrating polymeric network (IPN), achieved via salt-mediated Schiff-base condensation. These membranes targeted stringent water contaminants, with the COF nanoparticles characterized by angstrom-sized pores (15 à ), facilitating pore size reduction and unique morphologies. They exhibited a pure water flux of approximately 175 LMH at 100 psi (7 bar) transmembrane pressure, with improved selective transport through size and pore modulation. The functionalized membranes underwent thorough spectroscopic and microscopic characterization, displaying over 95 rejection of monovalent and 98 rejection of divalent salts for nearly 14 days, alongside significant chlorine tolerance. They also demonstrated over 97 rejection of common dye foulants. Covalent attachment of the nanomaterial (B-COF) followed by in-situ polymerization drove their efficient rejection performance. Retaining recyclability while maintaining separation performance enhances their green and sustainable applications. Mechanically durable, support-free, resilient, and cost-effective, these bioinspired membranes have the potential to drive enhanced domestic water decontamination, marking a significant advancement in membrane technology. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Chemical Engineering Journal
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Biomimetics; Life cycle; Membrane technology; Pore size; Water pollution, Anti-foulings; Bio-inspired membranes; Closed-loop; Closed-loop circularity; Commercial membranes; Covalent organic frameworks; Cytotoxic; Interpenetrating polymeric network; Landfill disposal; Non-cytotoxic, Cost effectiveness
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Jul 2024 07:35
Last Modified:	09 Jul 2024 07:35
URI:	http://eprints.iisc.ac.in/id/eprint/84762

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