Fabricating novel high-performance thin-film composite forward osmosis membrane with designed sulfonated covalent organic frameworks as interlayer
Fabricating novel high-performance thin-film composite forward osmosis membrane with designed sulfonated covalent organic frameworks as interlayer
复制标题
以磺化共价有机骨架为中间层制备新型高性能薄膜复合正渗透膜
DOI：
10.1016/j.memsci.2021.119476
复制
发表时间：
2021-06-06
影响因子：
9.5
通讯作者：
Zhan, Hongbing
中科院分区：
文献类型：
--
作者：
He, Yasan;Lin, Xiaogeng;Zhan, Hongbing
在此，以合理设计的磺化共价有机框架（COF）作为中间层，制备了一种具有高水通量（Jw）和低反盐通量（Js）的新型高选择性薄膜复合（TFC）正向渗透（FO）膜。该膜被设计为带负电、亲水性并具有COF选择性排斥能力的协同效应。 COF的磺化增强了其亲水性，提供负电荷并缩小了孔径，有利于脱盐。具有游离表面氨基的水解尼龙膜载体首先与均苯三甲酰氯（TMC）反应，变得亲水并带负电。然后，磺化 COF 通过氢键牢固地固定在改性载体上。最终通过界面聚合在载体上形成PA层。制备的 TFC-FO 膜克服了 Jw 和 Js 之间的权衡，在 FO 模式下具有增强的 FO 渗透性和优异的选择性 (Jw/Js = 24.7 L/g)。经测试，磺化 COF 中间层和尼龙支撑体的 TMC 改性对于高性能至关重要。本文报道的新策略为利用 COF 的优势制备高性能 FO 膜铺平了道路。
Herein, a novel highly selective thin-film composite (TFC) forward osmosis (FO) membrane with high water flux (Jw) and low reverse salt flux (Js) was fabricated with a rationally designed sulfonated covalent organic frameworks (COFs) as an interlayer. This membrane was designed to be negatively charged, hydrophilic and has the synergistic effect of the selective rejection ability of the COFs. The sulfonation of the COFs enhanced its hydrophilicity, offered negative charges and narrowed its pore size, benefiting the salt rejection. Hydrolyzed nylon membrane support with freed surface amino groups was firstly reacted with trimesoyl chloride (TMC) to become hydrophilic and negatively charged. The sulfonated COFs was then firmly mounted on the modified support via H-bonding. A PA layer was finally formed on the support via interfacial polymerization. The prepared TFC-FO membrane overcame the trade-off between Jw and Js with an enhanced FO permeation and superior selectivity (Jw/Js = 24.7 L/g) in FO mode. Both the sulfonated COF interlayer and TMC modification of nylon support were tested to be crucial to the high performance. The new strategy reported here paves a way for taking the advantages of COFs for preparing high-performance FO membranes.