Ultrathin heterostructured covalent organic framework membranes with interfacial molecular sieving capacity for fast water-selective permeation,Journal of Materials Chemistry A

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Ultrathin heterostructured covalent organic framework membranes with interfacial molecular sieving capacity for fast water-selective permeation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-26 , DOI: 10.1039/d0ta07352k
Hao Yang _{1,

2,

3,

4,

5} , Hong Wu _{1,

2,

3,

4,

5} , Yumeng Zhao _{1,

2,

3,

4,

5} , Meidi Wang _{1,

2,

3,

4,

5} , Yimeng Song _{1,

2,

3,

4,

5} , Xuanxuan Cheng _{1,

2,

3,

4,

5} , Hongjian Wang _{1,

2,

3,

4,

5} , Xingzhong Cao _{5,

6,

7,

8,

9} , Fusheng Pan _{1,

2,

3,

4,

5} , Zhongyi Jiang _{1,

2,

3,

4,

5}

Affiliation

Covalent organic frameworks (COFs) with designable architectures and superior stability have afforded intriguing opportunities to develop advanced separation membranes. Currently, COF membranes are rarely used in molecular separations due to their relatively large pore sizes. Herein, we report a vapor–liquid interfacial synthesis approach to in situ generate an azine-linked COF layer onto a pre-assembled carboxyl-functionalized COF layer at room temperature, acquiring an ultrathin heterostructured COF membrane with narrowly distributed interfacial sub-nanopores. Attributed to the covalent linkages between the two COF layers, the narrowly distributed interfacial sub-nanopores of ∼0.39 nm within the heterostructured COF membranes were formed, which endow the membranes with distinct interfacial molecular sieving capacity. The resulting COF membrane with a thickness of 28 nm exhibits a superior separation factor of 4464 and a high permeation flux of 14.35 kg m⁻² h⁻¹ for water/n-butanol separations. The design of ultrathin heterostructured COF membranes with interfacial molecular sieving capacity may facilitate the development of framework nanomaterial based membranes.

中文翻译：

具有界面分子筛功能的超薄异质共价有机骨架膜，可实现快速的水选择性渗透

具有可设计结构和优异稳定性的共价有机骨架（COF）为开发高级分离膜提供了诱人的机会。目前，由于COF膜的孔径相对较大，因此很少用于分子分离。此，我们报告一个气-液界面的合成方法来原位在室温下，在预组装的羧基官能化COF层上生成一个与嗪键连接的COF层，从而获得具有狭窄分布的界面亚纳米孔的超薄异结构COF膜。归因于两个COF层之间的共价键，在异质结构的COF膜中形成了约0.39nm的狭窄分布的界面亚纳米孔，这赋予了膜独特的界面分子筛分能力。所得的厚度为28 nm的COF膜表现出优异的分离系数4464和对水/ n的高渗透通量，为14.35 kg m ^-2 h ^-1-丁醇分离。具有界面分子筛分能力的超薄异质结构COF膜的设计可以促进基于框架纳米材料的膜的开发。

更新日期：2020-09-29

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