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Heterostructure membranes of high permeability and stability assembled from MXene and modified layered double hydroxide nanosheets
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Beijing University of Technology, China.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-3582-6075
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0002-0171-3569
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2023 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 688, article id 122100Article in journal (Refereed) Published
Abstract [en]

Two-dimensional (2D) MXene-based lamellar membranes play transformative roles in membrane filtration technology. Their practical use in water treatment is however hindered by several hurdles, e.g., unfavorable swelling due to weak interactions between adjacent MXene nanosheets, tortuous diffusion pathways of layered stacking, and the intrinsic aquatic oxidation-prone nature of MXene. Herein, nanoporous 2D/2D heterostructure membranes are elaborately constructed via solution-phase assembly of oppositely charged MXene and modified layered double hydroxide (MLDH) nanosheets. As a multifunctional component, positively charged holey MLDH nanosheets were first tailor-made to serve simultaneously as a binder, spacer and surface-modifier; next they were intercalated into negatively charged MXene lamella to enhance structural stability and mass transfer of membranes. As a result, the as-prepared MLDH@MXene heterostructure membranes successfully break the persistent trade-off between high permeability and selectivity while mitigating the common drawbacks in 2D MXene-based lamellar membranes, e.g., swelling issues, restacking problems, and vulnerable chemical stability. Noticeably, at an operating pressure of 4 bar and a feed solution of 100 ppm of Congo red, the heterostructure membranes enable a threefold jump in permeability (332.7 +/- 20 L m(-2) h(-1 )bar(-1)) when compared to the pristine MXene membrane (119.3 +/- 18 L m(-2 )h(-1) bar(-1)), and better operational stability without compromising the rejection.

Place, publisher, year, edition, pages
2023. Vol. 688, article id 122100
Keywords [en]
MXene membrane, 2D materials, Modified layered double hydroxide (MLDH), Heterostructure, High permeability
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-223781DOI: 10.1016/j.memsci.2023.122100ISI: 001086562000001Scopus ID: 2-s2.0-85172137250OAI: oai:DiVA.org:su-223781DiVA, id: diva2:1812255
Available from: 2023-11-15 Created: 2023-11-15 Last updated: 2023-11-15Bibliographically approved

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Lu, YahuaZhang, MiaoChang, JianSikdar, AnirbanYuan, Jiayin

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Lu, YahuaZhang, MiaoChang, JianSikdar, AnirbanYuan, Jiayin
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