Zhao Qipeng, Zhao Die Ling, Nai Mui Hoon, Chen Shing Bor, Chung Tai-Shung
Department of Chemical and Biomolecular Engineering, National University of Singapore 4 Engineering Drive 4, Singapore 117585, Singapore.
Department of Biomedical Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore.
ACS Appl Mater Interfaces. 2021 Jul 21;13(28):33024-33033. doi: 10.1021/acsami.1c07673. Epub 2021 Jul 8.
In this work, nanovoid-enhanced thin-film composite (TFC) membranes have been successfully fabricated using ZIF-67 nanoparticles as the sacrificial template. By incorporating different amounts of ZIF-67 during interfacial polymerization, the resultant TFC membranes can have different degrees of nanovoids after self-degradation of ZIF-67 in water, consequently influencing their physiochemical properties and separation performance. Nanovoid structures endow the membranes with additional passages for water molecules. Thus, all the newly developed TFC membranes exhibit better separation performance for brackish water reverse osmosis (BWRO) desalination than the pristine TFC membrane. The membrane made from 0.1 wt % ZIF-67 shows a water permeance of 2.94 LMH bar and a salt rejection of 99.28% when being tested under BWRO at 20 bar. This water permeance is 53% higher than that of the pristine TFC membrane with the salt rejection well maintained.
在这项工作中，以ZIF-67纳米颗粒作为牺牲模板，成功制备了纳米孔增强型薄膜复合（TFC）膜。通过在界面聚合过程中加入不同量的ZIF-67，所得的TFC膜在ZIF-67于水中自降解后会具有不同程度的纳米孔，从而影响其物理化学性质和分离性能。纳米孔结构为膜赋予了额外的水分子通道。因此，所有新开发的TFC膜在苦咸水反渗透（BWRO）脱盐方面均表现出比原始TFC膜更好的分离性能。由0.1 wt% ZIF-67制成的膜在20 bar的BWRO条件下测试时，水渗透通量为2.94 LMH bar，脱盐率为99.28%。该水渗透通量比原始TFC膜高53%，且脱盐率保持良好。
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