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Nat Mater. 2017 Dec;16(12):1198-1202. doi: 10.1038/nmat5025. Epub 2017 Nov 13.

Ultrathin graphene-based membrane with precise molecular sieving and ultrafast solvent permeation.

Author information

1
National Graphene Institute, University of Manchester, Manchester M13 9PL, UK.
2
School of Chemical Engineering and Analytical Science, University of Manchester, Manchester M13 9PL, UK.
3
School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
4
Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
5
Chinese Academy of Sciences Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei, Anhui 230027, China.
6
Department of Physics, University of York, York YO10 5DD, UK.
7
Imdea Nanociencia, Faraday 9, 28015 Madrid, Spain.

Abstract

Graphene oxide (GO) membranes continue to attract intense interest due to their unique molecular sieving properties combined with fast permeation. However, their use is limited to aqueous solutions because GO membranes appear impermeable to organic solvents, a phenomenon not yet fully understood. Here, we report efficient and fast filtration of organic solutions through GO laminates containing smooth two-dimensional (2D) capillaries made from large (10-20 μm) flakes. Without modification of sieving characteristics, these membranes can be made exceptionally thin, down to ∼10 nm, which translates into fast water and organic solvent permeation. We attribute organic solvent permeation and sieving properties to randomly distributed pinholes interconnected by short graphene channels with a width of 1 nm. With increasing membrane thickness, organic solvent permeation rates decay exponentially but water continues to permeate quickly, in agreement with previous reports. The potential of ultrathin GO laminates for organic solvent nanofiltration is demonstrated by showing >99.9% rejection of small molecular weight organic dyes dissolved in methanol. Our work significantly expands possibilities for the use of GO membranes in purification and filtration technologies.

PMID:
29170556
DOI:
10.1038/nmat5025

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