期刊
FLATCHEM
卷 36, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.flatc.2022.100450
关键词
Graphene oxide; Chitosan; Nanofiltration membrane; Separation dye
资金
- Natural Scientific Foundation of China [51878361, 52070104, 51503112]
- Natural Scientific Foundation of Shandong Province [ZR2019MEM048]
- State Key Project of International Cooperation Research [2016YFE0110800, 2017YFE0108300]
- National Program for Introducing Talents of Discipline to Universities (111 plan)
- 1st class discipline program of Materials Science of Shandong Province
- Double-Hundred Foreign Expert Program of Shandong Province (2019-2021)
In this study, GO-chitosan (GO-CS) composites with covalent bonds were synthesized using a one-step hydrothermal method, and composite membranes with widened and defined two-dimensional channels were prepared. The GO-CS composite membrane exhibited high water permeability and excellent molecular sieving ability, and the presence of covalent bonds between GO and CS significantly enhanced membrane stability.
The weak interlayer interactions and poor mechanical stability of graphene oxide (GO) membranes pose significant challenges in any practical application environment. Moreover, the layered stacked GO membranes have low water permeability and low selectivity for small molecules due to their inherent nano-interlayer channels. In order to solve the problems of mechanical properties and size control of interlayer nanochannels, we synthesized GO-chitosan (GO-CS) composites with covalent bonds by a one-step hydrothermal method, and prepared a series of composite membranes by vacuum filtration. The GO-CS composite membrane resulted in a widened and defined two-dimensional (2D) channel due to the intercalation of GO-CS. The prepared GO-CS composite membrane has the highest water permeability of 107.4 L.m(-2).h(-1).bar(-1), which is nearly 4 times that of the GO membrane. Almost complete of methylene blue (MnB), Congo red CR), rhodamine B (RB) dye molecules, with excellent molecular sieving ability. Furthermore, the presence of covalent bonds between GO and CS resulted in significantly enhanced membrane stability. We aim to provide potential applications for next-generation nanofiltration membranes by tuning the microstructure of the membranes.
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