High‐Flux Membranes Based on the Covalent Organic Framework COF‐LZU1 for Selective Dye Separation by Nanofiltration,Angewandte Chemie International Edition

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High‐Flux Membranes Based on the Covalent Organic Framework COF‐LZU1 for Selective Dye Separation by Nanofiltration
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-03-08 , DOI: 10.1002/anie.201712816
Hongwei Fan _{1,

2} , Jiahui Gu ₁ , Hong Meng ₁ , Alexander Knebel ₂ , Jürgen Caro ₂

Affiliation

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.

中文翻译：

基于共价有机框架COF-LZU1的高通量膜用于纳滤选择性分离染料

共价有机骨架（COFs）由于其高孔隙率和组织良好的通道结构而成为高级水处理膜的有吸引力的候选者。本文中，通过原位溶剂热合成在氧化铝管上制备了厚度仅为400 nm的连续二维亚胺连接的COF-LZU1连续膜。膜显示出极好的透水性（约760 L m ^-2 h ^-1 MPa ^-1），对于大于1.2 nm的水溶性染料，其良好的拒收率超过90％。通过COF-LZU1膜的透水率比大多数具有相似排斥率的膜要高得多。长期运行证明了COF-LZU1膜具有出色的稳定性。由于该膜对水合盐离子没有选择性（选择性<12％），因此它也适用于从盐水溶液中纯化染料产品。优异的性能和出色的水稳定性使COF-LZU1膜成为有趣的净水系统。

更新日期：2018-03-08

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