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Moderately Crystalline Azine-Linked Covalent Organic Framework Membrane for Ultrafast Molecular Sieving
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-07-28 , DOI: 10.1021/acsami.1c06891 Decheng Liu 1 , Kai Li 1 , Min Li 1 , Zheng Wang 1 , Meixia Shan 1 , Yatao Zhang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-07-28 , DOI: 10.1021/acsami.1c06891 Decheng Liu 1 , Kai Li 1 , Min Li 1 , Zheng Wang 1 , Meixia Shan 1 , Yatao Zhang 1
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Covalent organic frameworks are potential candidates for the preparation of advanced molecular separation membranes due to their porous structure, uniform aperture, and chemical stability. However, the fabrication of continuous COF membranes in a facile and mild manner remains a challenge. Herein, a continuous, defect-free, and flexible azine-linked ACOF-1 membrane was prepared on a hydrolyzed polyacrylonitrile (HPAN) substrate via in situ interfacial polymerization (IP). A moderately crystalline COF ultrathin selective layer enabled ultrafast molecular sieving. The effect of synthesis parameters including precursor concentration, catalyst dosage, and reaction duration on the dye separation performance was investigated. The optimized membrane displayed an ultrahigh water permeance of 142 L m–2 h–1 bar–1 together with favorable rejection (e.g., 99.2% for Congo red and 96.3% for methyl blue). The water permeance is 5–12 times higher than that of reported membranes with similar rejections. In addition, ACOF-1 membranes demonstrate outstanding long-term stability together with organic solvent and extreme pH resistance. Meanwhile, the membrane is suitable for removing dyes from salt solution products owing to their nonselective permeation for hydrated salt ions (<10.6%). The superior performance and the excellent chemical stability render the ACOF-1 membrane a satisfactory system for water purification.
中文翻译：
用于超快分子筛分的中等结晶氮杂共价有机骨架膜
共价有机骨架由于其多孔结构、均匀孔径和化学稳定性而成为制备先进分子分离膜的潜在候选材料。然而，以简便和温和的方式制造连续的 COF 膜仍然是一个挑战。在此，通过原位界面聚合 (IP)在水解聚丙烯腈 (HPAN) 基材上制备了连续、无缺陷且柔性的吖嗪连接 ACOF-1 膜。中等结晶度的 COF 超薄选择性层可实现超快分子筛分。研究了合成参数包括前体浓度、催化剂用量和反应持续时间对染料分离性能的影响。优化后的膜具有 142 L m –2的超高透水性h –1 bar –1以及良好的排斥反应（例如，刚果红为 99.2%，甲基蓝为 96.3%）。水渗透率比报告的具有类似截留率的膜高 5-12 倍。此外，ACOF-1 膜表现出出色的长期稳定性以及有机溶剂和极端 pH 耐受性。同时，由于它们对水合盐离子（<10.6%）的非选择性渗透，该膜适用于从盐溶液产品中去除染料。卓越的性能和优异的化学稳定性使 ACOF-1 膜成为令人满意的水净化系统。
更新日期：2021-08-11
中文翻译：
用于超快分子筛分的中等结晶氮杂共价有机骨架膜
共价有机骨架由于其多孔结构、均匀孔径和化学稳定性而成为制备先进分子分离膜的潜在候选材料。然而，以简便和温和的方式制造连续的 COF 膜仍然是一个挑战。在此，通过原位界面聚合 (IP)在水解聚丙烯腈 (HPAN) 基材上制备了连续、无缺陷且柔性的吖嗪连接 ACOF-1 膜。中等结晶度的 COF 超薄选择性层可实现超快分子筛分。研究了合成参数包括前体浓度、催化剂用量和反应持续时间对染料分离性能的影响。优化后的膜具有 142 L m –2的超高透水性h –1 bar –1以及良好的排斥反应（例如，刚果红为 99.2%，甲基蓝为 96.3%）。水渗透率比报告的具有类似截留率的膜高 5-12 倍。此外，ACOF-1 膜表现出出色的长期稳定性以及有机溶剂和极端 pH 耐受性。同时，由于它们对水合盐离子（<10.6%）的非选择性渗透，该膜适用于从盐溶液产品中去除染料。卓越的性能和优异的化学稳定性使 ACOF-1 膜成为令人满意的水净化系统。
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