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In Situ Growth of Cationic Covalent Organic Frameworks (COFs) for Mixed Matrix Membranes with Enhanced Performances.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.langmuir.0c01714 Xingyuan Wang 1 , Xiansong Shi 1 , Yong Wang 1
Langmuir ( IF 3.7 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.langmuir.0c01714 Xingyuan Wang 1 , Xiansong Shi 1 , Yong Wang 1
Affiliation
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Covalent organic frameworks (COFs) are increasingly utilized as doping agents for the design of advanced ultrafiltration mixed matrix membranes, thanks to their prominent nanoporosity and excellent polymer compatibility. However, current strategies are largely limited in the complicated postaddition of neutral COF particulates. Herein, cationic COFs, namely, TpEB, with sizes down to ∼39 nm are in situ synthesized in polyacrylonitrile (PAN) solution as crystalline fillers for the production of highly permeable TpEB–PAN ultrafiltration membranes. After the condensation of monomer pairs, the growth of cationic TpEB crystallites is restrained due to the electrostatic interaction with negatively charged PAN chains, leading to the formation of a homogeneous TpEB-incorporated casting solution. During the subsequent nonsolvent-induced phase separation process, TpEB crystallites facilitate exchange between the solvent and the nonsolvent because of their hydrophilic and nanoporous nature, accelerating the rate of phase inversion to form a highly porous membrane surface. Thus-prepared TpEB–PAN membranes deliver a tight rejection of BSA with water permeance of up to 380 L m–2 h–1 bar–1, which is 35.6% higher than that of the original PAN membranes prepared without TpEB. The TpEB–PAN membranes also exhibit enhanced operation stabilities and fouling resistances. This in situ growth strategy suggests a new avenue for the preparation of advanced mixed matrix membranes.
中文翻译：
具有增强性能的混合基质膜的阳离子共价有机骨架（COF）的原位生长。
共价有机骨架（COFs）由于其出色的纳米孔隙度和出色的聚合物相容性，越来越多地被用作高级超滤混合基质膜设计的掺杂剂。然而，当前的策略在中性COF颗粒的复杂后添加方面受到很大限制。这里，COF的阳离子，即TpEB，具有尺寸下降到~39纳米是原位在聚丙烯腈（PAN）溶液中合成为结晶填料，用于生产高渗透性TpEB-PAN超滤膜。单体对缩合后，由于与带负电荷的PAN链发生静电相互作用，阳离子TpEB微晶的生长受到抑制，从而形成了均质的掺入TpEB的流延溶液。在随后的非溶剂诱导的相分离过程中，TpEB微晶由于其亲水性和纳米孔性质而促进了溶剂与非溶剂之间的交换，从而加快了相转化的速度，从而形成了高度多孔的膜表面。如此制备的TpEB-PAN膜可提供高达380 L m –2 h –1 bar的水透过率，从而对BSA具有严格的抑制作用–1，比不使用TpEB制备的原始PAN膜高35.6％。TpEB-PAN膜还具有增强的操作稳定性和耐污垢性。这种原位生长策略为制备高级混合基质膜提供了一条新途径。
更新日期：2020-09-22
中文翻译：
具有增强性能的混合基质膜的阳离子共价有机骨架（COF）的原位生长。
共价有机骨架（COFs）由于其出色的纳米孔隙度和出色的聚合物相容性，越来越多地被用作高级超滤混合基质膜设计的掺杂剂。然而，当前的策略在中性COF颗粒的复杂后添加方面受到很大限制。这里，COF的阳离子，即TpEB，具有尺寸下降到~39纳米是原位在聚丙烯腈（PAN）溶液中合成为结晶填料，用于生产高渗透性TpEB-PAN超滤膜。单体对缩合后，由于与带负电荷的PAN链发生静电相互作用，阳离子TpEB微晶的生长受到抑制，从而形成了均质的掺入TpEB的流延溶液。在随后的非溶剂诱导的相分离过程中，TpEB微晶由于其亲水性和纳米孔性质而促进了溶剂与非溶剂之间的交换，从而加快了相转化的速度，从而形成了高度多孔的膜表面。如此制备的TpEB-PAN膜可提供高达380 L m –2 h –1 bar的水透过率，从而对BSA具有严格的抑制作用–1，比不使用TpEB制备的原始PAN膜高35.6％。TpEB-PAN膜还具有增强的操作稳定性和耐污垢性。这种原位生长策略为制备高级混合基质膜提供了一条新途径。
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