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Azobenzene-assisted exfoliation of 2D covalent organic frameworks into large-area, few-layer nanosheets for high flux and selective molecular separation membrane
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.memsci.2020.117864
Jin Yao , Chang Liu , Xiaoqiu Liu , Jing Guo , Suobo Zhang , Jifu Zheng , Shenghai Li

Abstract The porous 2D covalent organic nanosheets (CONs) membrane has become a new generation of membrane material due to its ultrahigh permeation flux. The main challenge in fabricating CONs membrane is how to exfoliate covalent organic frameworks (COFs) into large-scale, few-layer nanosheets. Herein, we presented a simple and economical azobenzene template approach for exfoliating 2D COFs into large nanosheets and achieved fabrication of ultrathin CONs membrane successfully. Three COFs with different skeleton structures were chosen to explore the influencing factors for effective exfoliating. We found that the compatibility between azobenzene molecules and COFs skeleton structure was the key point for exfoliation. When the COF skeleton matching with the azobenzene molecular structure, COFs can be easily exfoliated into larger-scale CONs than nanosheets prepared by conventional exfoliation methods. The as-exfoliated nanosheets membrane showed a higher water flux (596 L m2 h-1 bar-1) than a graphene oxide (GO) membrane (4.3 L m2 h-1 bar-1) and high rejection of dye molecules, due to the nano-channels perpendicular to the surface of the membrane.

中文翻译:

偶氮苯辅助将二维共价有机骨架剥离成大面积、少层纳米片,用于高通量和选择性分子分离膜

摘要 多孔二维共价有机纳米片(CONs)膜因其超高的渗透通量而成为新一代膜材料。制造 CONs 膜的主要挑战是如何将共价有机框架 (COFs) 剥离成大规模、少层的纳米片。在此,我们提出了一种简单且经济的偶氮苯模板方法,用于将二维 COFs 剥离成大纳米片,并成功制备了超薄 CONs 膜。选择了三种不同骨架结构的COFs来探讨有效去角质的影响因素。我们发现偶氮苯分子与COFs骨架结构之间的相容性是剥离的关键。当COF骨架与偶氮苯分子结构匹配时,与通过常规剥离方法制备的纳米片相比,COF 可以很容易地剥离成更大尺寸的 CON。剥离后的纳米片膜显示出比氧化石墨烯 (GO) 膜(4.3 L m2 h-1 bar-1)更高的水通量(596 L m2 h-1 bar-1)和染料分子的高阻隔,这是由于纳米通道垂直于膜表面。
更新日期:2020-03-01
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