剥脱关节
偶氮苯
膜
共价键
材料科学
化学工程
渗透
纳米反应器
分子
纳米技术
化学
纳米颗粒
有机化学
聚合物
复合材料
石墨烯
工程类
生物化学
作者
Jin Yao,Chang Liu,Xiaoqiu Liu,Jing Guo,Suobo Zhang,Jifu Zheng,Shenghai Li
标识
DOI:10.1016/j.memsci.2020.117864
摘要
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI