Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 33, Issue 23, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202214889
Keywords
anti-fouling; bacterial adhesion; liquid phase exfoliation; pristine graphene; water management
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In this study, an efficient and green strategy was proposed to fabricate mu m-thick, graphene-based laminates by liquid phase exfoliation and vacuum filtration. The membranes showed structural and mechanical stability during long-term operation in water, and exhibited size selection and anion-selectivity in ion transport studies. Additionally, the membranes demonstrated high rejection rates and antibacterial properties. Therefore, these green graphene-based membranes offer a viable option for future water management applications.
Carbon-based materials, such as graphene oxide and reduced graphene oxide membranes have been recently used to fabricate ultrathin, high-flux, and energy-efficient membranes for ionic and molecular sieving in aqueous solution. However, these membranes appeared rather unstable during long-term operation in water with a tendency to swell over time. Membranes produced from pristine, stable, layered graphene materials may overcome these limitations while providing high-level performance. In this paper, an efficient and green strategy is proposed to fabricate mu m-thick, graphene-based laminates by liquid phase exfoliation in Cyrene and vacuum filtration on a PVDF support. The membranes appear structurally robust and mechanically stable, even after 90 days of operation in water. In ion transport studies, the membranes show size selection (>3.3 angstrom) and anion-selectivity via the positively charged nanochannels forming the graphene laminate. In antibiotic (tetracycline) diffusion studies under dynamic conditions, the membrane achieve rejection rates higher than 95%. Sizable antibacterial properties are demonstrated in contact method tests with Staphylococcus aureus and Escherichia coli bacteria. Overall, these green graphene-based membranes represent a viable option for future water management applications.
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