Supported MXene/GO Composite Membranes with Suppressed Swelling for Metal Ion Sieving

Novel two-dimensional (2D) membranes have been utilized in water purification or seawater desalination due to their highly designable structure. However, they usually suffer from swelling problems when immersed in solution, which limits their further applications. In this study, 2D cross-linked MXen...

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Bibliographic Details
Published in:Membranes (Basel) 2021-08, Vol.11 (8), p.621
Main Authors: Yin, Zongjie, Lu, Zong, Xu, Yanyan, Zhang, Yonghong, He, Liliang, Li, Peishan, Xiong, Lei, Ding, Li, Wei, Yanying, Wang, Haihui
Format: Article
Language:English
Subjects:
Aluminum
Contact angle
Crosslinking
Desalination
Graphene
Heat
Heat treatment
Heat treatments
ion rejection
Membrane separation
Membranes
Metal carbides
Metal ions
MXene
MXenes
Nanomaterials
Nanostructure
Polyamide resins
Polyamides
Radiation
Scanning electron microscopy
Seawater
Sodium
Spectrum analysis
Substrates
Swelling
Transition metals
Two dimensional materials
two-dimensional membrane
Water purification
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Summary:Novel two-dimensional (2D) membranes have been utilized in water purification or seawater desalination due to their highly designable structure. However, they usually suffer from swelling problems when immersed in solution, which limits their further applications. In this study, 2D cross-linked MXene/GO composite membranes supported on porous polyamide substrates are proposed to improve the antiswelling property and enhance the ion-sieving performance. Transition-metal carbide (MXene) nanosheets were intercalated into GO nanosheets, where the carboxyl groups of GO combined the neighboring hydroxyl terminal groups of MXene with the formation of -COO- bonds between GO and MXene nanosheets via the cross-linking reaction (−OH + −COOH = −COO− + H2O) after heat treatment. The permeation rates of the metal ions (Li+, Na+, K+, Al3+) through the cross-linked MXene/GO composite membrane were 7–40 times lower than those through the pristine MXene/GO membrane. In addition, the cross-linked MXene/GO composite membrane showed excellent Na+ rejection performance (99.3%), which was significantly higher than that through pristine MXene/GO composite membranes (80.8%), showing improved ion exclusion performance. Such a strategy represents a new avenue to develop 2D material-derived high-performance membranes for water purification.
ISSN:2077-0375
2077-0375
DOI:10.3390/membranes11080621