渗透
材料科学
膜
共价键
共价有机骨架
气体分离
选择性
化学工程
纳米技术
多孔性
有机化学
复合材料
催化作用
渗透
生物化学
工程类
化学
作者
Baoju Li,Zitao Wang,Zhuangzhuang Gao,Jinquan Suo,Ming Xue,Yushan Yan,Valentin Valtchev,Shilun Qiu,Qianrong Fang
标识
DOI:10.1002/adfm.202300219
摘要
Abstract Covalent organic frameworks (COFs) are proposed as promising candidates for engineering advanced molecular sieving membranes due to their precise pore sizes, modifiable pore environment, and superior stability. However, COFs are insoluble in common solvents and do not melt at high temperatures, which presents a great challenge for the fabrication of COF‐based membranes (COFMs). Herein, for the first time, a new synthetic strategy is reported to prepare continuous and intact self‐standing COFMs, including 2D N‐COF membrane and 3D COF‐300 membrane. Both COFMs show excellent selectivity of H 2 /CO 2 mixed gas (13.8 for N‐COF membrane and 11 for COF‐300 membrane), and especially ultrahigh H 2 permeance (4319 GPU for N‐COF membrane and 5160 GPU for COF‐300 membrane), which is superior to those of COFMs reported so far. It should be noted that the overall separation performance of self‐standing COFMs exceeds the Robeson upper bound. Furthermore, a theoretical study based on Grand Canonical Monte Carlo (GCMC) simulation is performed to explain the excellent separation of H 2 /CO 2 through COFMs. Thus, this facile preparation method will provide a broad prospect for the development of self‐standing COFMs with highly efficient H 2 purification.
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