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Heterostructure membranes of high permeability and stability assembled from MXene and modified layered double hydroxide nanosheets

Lu, Yahua (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK),Beijing University of Technology, China
Zhang, Miao, 1990- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK)
Chang, Jian, 1990- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Sikdar, Anirban (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK)
Wang, Naixin (author)
An, Quan-Fu (author)
Yuan, Jiayin, 1979- (author)
Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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 (creator_code:org_t)
2023
2023
English.
In: Journal of Membrane Science. - 0376-7388 .- 1873-3123. ; 688
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Keyword

MXene membrane
2D materials
Modified layered double hydroxide (MLDH)
Heterostructure
High permeability

Publication and Content Type

ref (subject category)
art (subject category)

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