渗透
膜
纳滤
共价有机骨架
化学工程
选择性
共价键
多孔性
膜技术
化学
色谱法
材料科学
有机化学
渗透
催化作用
生物化学
工程类
作者
Hongwei Fan,Jiahui Gu,Hong Meng,Alexander Knebel,Jürgen Caro
标识
DOI:10.1002/anie.201712816
摘要
Covalent organic frameworks (COFs) are attractive candidates for advanced water-treatment membranes owing to their high porosity and well-organized channel structures. Herein, the continuous two-dimensional imine-linked COF-LZU1 membrane with a thickness of only 400 nm was prepared on alumina tubes by in situ solvothermal synthesis. The membrane shows excellent water permeance (ca. 760 L m-2 h-1 MPa-1 ) and favorable rejection rates exceeding 90 % for water-soluble dyes larger than 1.2 nm. The water permeance through the COF-LZU1 membrane is much higher than that of most membranes with similar rejection rates. Long-time operation demonstrates the outstanding stability of the COF-LZU1 membrane. As the membrane has no selectivity for hydrated salt ions (selectivity <12 %), it is also suitable for the purification of dye products from saline solutions. The excellent performance and the outstanding water stability render the COF-LZU1 membrane an interesting system for water purification.
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