Homogeneous Polymerization of Self-standing Covalent Organic Framework Films with High Performance in Molecular Separation.
Homogeneous Polymerization of Self-standing Covalent Organic Framework Films with High Performance in Molecular Separation.
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DOI：
10.1021/acsami.0c11022
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发表时间：
2020-08
影响因子：
9.5
通讯作者：
Yasan He;Xiaogeng Lin;Jianhua Chen;Zhiyong Guo;Hongbing Zhan
中科院分区：
文献类型：
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作者：
Yasan He;Xiaogeng Lin;Jianhua Chen;Zhiyong Guo;Hongbing Zhan
共价有机骨架（COF）通常以微晶粉末形式分离。将 COF 制造成高质量的自支撑薄膜以充分利用其有序孔道进行分子分离仍然是一项重大挑战。在这里，我们报告了一种通过均相聚合制造自支撑亚胺连接 COF 薄膜的新策略，其中薄膜从透明溶液中形成，而不形成无定形沉淀物。单体中丰富的碱性氮原子充当反应控制器，实现均相聚合，并促进COF微晶紧密自聚集，通过氢键形成致密薄膜。尼龙膜上的化学支撑自支撑 COF 薄膜也是通过原位生长方法开发的。所得薄膜在过滤刚果红溶液时表现出前所未有的超快渗透性（2822 L m-2 h-1 MPa-1）和高截留率（99.8%），展示了这种新策略在制造高质量自支撑COF薄膜方面的优势。
Covalent organic frameworks (COFs) are typically isolated as microcrystalline powders. It remains cardinal challenging to fabricate COFs to high-quality self-standing films to get full advantage of their ordered pore channels for molecular separation. Here, we report a new strategy for fabricating self-standing imine-linked COF films via homogeneous polymerization where films emerge from clear solutions without forming amorphous precipitates. The abundant basic nitrogen atoms of the monomers acted as a reaction controller to realize the homogeneous polymerization, and also promoted the tight self-aggregation of COF crystallites to form compact films via H-bonding. The chemically supported self-standing COF films on nylon membrane were also developed via an in-situ growth method. The resulting films showed an unprecedentedly ultrafast permeance of 2822 L m-2 h-1 MPa-1 with a high rejection (99.8%) in the filtration of congo red solution, demonstrating the advantage of this new strategy on fabricating high-quality self-standing COF films.