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Cationic biocide anchored graphene oxide-based membranes for water purification

Kumar Samantaray, P and Bose, S (2018) Cationic biocide anchored graphene oxide-based membranes for water purification. In: Proceedings of the Indian National Science Academy, 84 (3). pp. 669-679.

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Official URL: https://doi.org/10.16943/ptinsa/2018/49311


PVDF/PBSA poly(vinylidene fluoride)/poly (butylene succinate-co-adipate) phase inversion membranes were obtained using non-solvent induced phase separation and their porous hierarchical morphology were assessed using SEM. In order to render the membrane surface antibacterial, graphene oxide sheets were modified with a cationic biocide, trihexyltetradecylphosphonium chloride, and were subsequently grafted on the membrane surface through esterification. Successful grafting was confirmed by XPS and supported with NMR studies. A standard plate count method was used to assess the antimicrobial properties taking E. coli and S. aureus as model bacterial systems. To gain insight into the mechanism of bacterial inactivation, intracellular ROS (reactive oxygen species) generation was investigated on the microbial strains. The trans-membrane flux was measured using a cross-flow flux setup. For evaluating the long term efficacy of modified membranes; flux was also measured for different membranes both with pure water and bacterial feed. The membranes were excellent in retaining the flux in a long run after modifications. The anti-fouling performance was carried out using BSA (Bovine serum albumin) as a model biofoulant. The flux recovery ratio was significantly higher as compared to pristine membranes. Taken together, these modified membranes open new avenues in designing unique membranes for water purification.

Item Type: Journal Article
Publication: Proceedings of the Indian National Science Academy
Publisher: Indian National Science Academy
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Biocides; Body fluids; Chlorine compounds; Escherichia coli; Fluorine compounds; Grafting (chemical); Graphene; Phase separation; Purification; Water treatment plants, Anti-microbial properties; Antibacterial; Antifouling; GO (graphene oxide); Phase inversion membrane; Poly(vinylidene fluoride); Transmembranes; Trihexyltetradecylphosphonium, Membranes
Department/Centre: Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 27 Aug 2022 09:13
Last Modified: 27 Aug 2022 09:13
URI: https://eprints.iisc.ac.in/id/eprint/76253

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