A two-dimensional cationic covalent organic framework membrane for selective molecular sieving

doi:10.1039/c8ta04178d

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	A two-dimensional cationic covalent organic framework membrane for selective molecular sieving
	Zhang, W. X.; Zhang, L. M.; Zhao, H. F.; Li, B.; Ma, H. P.
	2018
发表期刊	Journal of Materials Chemistry A
ISSN	2050-7488
卷号	6 期号:27 页码:13331-13339
摘要	The search of new-type membrane materials with ideal molecular sieving caused wide interest in both academia and industry. Covalent organic frameworks (COFs) are excellent candidates for efficient molecular separation because of their well-defined pore structure and fine-tuned pore size. However, existing synthetic approaches of COFs mainly result in an insoluble and unprocessable powder, which severely restricts their widespread applicability. In this work, a facile bottom-up interfacial crystallization approach to obtain a two-dimensional (2D) cationic COF, EB-COF:Br nanosheets, is reported. Then a layer-by-layer restacking process is performed to fabricate a continuous and dense 2D ionic COF membrane with a tunable thickness by simple vacuum filtration. The 2D COF membrane shows much higher solvent permeability than graphene-oxide membranes and commercial nanofiltration membranes because of its high porosity. Moreover, due to there being abundant positive charge sites in its pore walls, the EB-COF:Br membrane demonstrates highly selective sieving performance for dye molecules/ions with different charges and sizes. The EB-COF:Br membrane can efficiently reject approximate to>98% of anionic dye molecules/ions, while maintaining high solvent permeability. The cationic 2D COF membrane far outperforms other nanofiltration membranes in terms of excellent selective molecular/ionic sieving and superior solvent permeability. The result suggested that the ionic COF membrane can offer a new avenue for separation technology.
关键词	graphene oxide membranes potential applications water desalination ionic transport separation nanosheets permeation ultrathin precise construction Chemistry Energy & Fuels Materials Science
DOI	10.1039/c8ta04178d
收录类别	SCI ; EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/60880
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	Zhang, W. X.,Zhang, L. M.,Zhao, H. F.,et al. A two-dimensional cationic covalent organic framework membrane for selective molecular sieving[J]. Journal of Materials Chemistry A,2018,6(27):13331-13339.
APA	Zhang, W. X.,Zhang, L. M.,Zhao, H. F.,Li, B.,&Ma, H. P..(2018).A two-dimensional cationic covalent organic framework membrane for selective molecular sieving.Journal of Materials Chemistry A,6(27),13331-13339.
MLA	Zhang, W. X.,et al."A two-dimensional cationic covalent organic framework membrane for selective molecular sieving".Journal of Materials Chemistry A 6.27(2018):13331-13339.

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