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"Mix-Then-On-Demand...
"Mix-Then-On-Demand-Complex" : In Situ Cascade Anionization and Complexation of Graphene Oxide for High-Performance Nanofiltration Membranes
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- Li, Xiaoting (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Beijing University of Technology, P. R. China
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Wang, Yanlei (author)
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- Chang, Jian (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Sun, Hao (author)
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He, Hongyan (author)
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Qian, Cheng (author)
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- Kheirabad, Atefeh Khorsand (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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An, Quan-Fu (author)
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Wang, Naixin (author)
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- Zhang, Miao (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Yuan, Jiayin (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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(creator_code:org_t)
- 2021-02-15
- 2021
- English.
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In: ACS Nano. - : American Chemical Society (ACS). - 1936-0851 .- 1936-086X. ; 15:3, s. 4440-4449
- Related links:
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https://doi.org/10.1...
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https://pubs.acs.org...
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Abstract
Subject headings
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- Assembling two-dimensional (2D) materials by polyelectrolyte often suffers from inhomogeneous microstructures due to the conventional mixing-and-simultaneous-complexation procedure (mix-and-complex) in aqueous solution. Herein a mix-then-on-demand-complex concept via on-demand in situ cascade anionization and ionic complexation of 2D materials is raised that drastically improves structural order in 2D assemblies, as exemplified by classical graphene oxide (GO)-based ultrathin membranes. Specifically, in dimethyl sulfoxide, the carboxylic acid-functionalized GO sheets (COOH-GOs) were mixed evenly with a cationic poly(ionic liquid) (PIL) and upon filtration formed a well-ordered layered composite membrane with homogeneous distribution of PIL chains in it; next, whenever needed, it was alkali-treated to convert COOH-GO in situ into its anionized state COO--GO that immediately complexed ionically with the surrounding cationic PIL chains. This mix-then-on-demand-complex concept separates the ionic complexation of GO and polyelectrolytes from their mixing step. By synergistically combining the PIL-induced hydrophobic confinement effect and supramolecular interactions, the as-fabricated nanofiltration membranes carry interface transport nanochannels between GO and PIL, reaching a high water permeability of 96.38 L m(-2) h(-1) bar(-1) at a maintained excellent dye rejection 99.79% for 150 h, exceeding the state-of-the-art GO-based hybrid membranes. The molecular dynamics simulations support the experimental data, confirming the interface spacing between GO and PIL as the water transport channels.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- graphene oxide
- ionic complexation
- nanofiltration
- poly(ionic liquid)
- confinement effect
Publication and Content Type
- ref (subject category)
- art (subject category)
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ACS Nano
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- By the author/editor
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Li, Xiaoting
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Wang, Yanlei
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Chang, Jian
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Sun, Hao
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He, Hongyan
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Qian, Cheng
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show more...
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Kheirabad, Atefe ...
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An, Quan-Fu
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Wang, Naixin
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Zhang, Miao
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Yuan, Jiayin
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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ACS Nano
- By the university
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Stockholm University