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Crystalline 2D Covalent Organic Framework Membranes for High-Flux Organic Solvent Nanofiltration
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-10-05 , DOI: 10.1021/jacs.8b08788 Digambar B. Shinde 1 , Guan Sheng 1 , Xiang Li 1 , Mayur Ostwal 1 , Abdul-Hamid Emwas 2 , Kuo-Wei Huang 3 , Zhiping Lai 1
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2018-10-05 , DOI: 10.1021/jacs.8b08788 Digambar B. Shinde 1 , Guan Sheng 1 , Xiang Li 1 , Mayur Ostwal 1 , Abdul-Hamid Emwas 2 , Kuo-Wei Huang 3 , Zhiping Lai 1
Affiliation
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Two-dimensional (2D) covalent organic framework (COF) materials have the most suitable microstructure for membrane applications in order to achieve both high flux and high selectivity. Here, we report the synthesis of a crystalline TFP-DHF 2D COF membrane constructed from two precursors of 1,3,5-triformylphloroglucinol (TFP) and 9,9-dihexylfluorene-2,7-diamine (DHF) through the Langmuir-Blodgett (LB) method, for the first timed. A single COF layer is precisely four unit cells thick and can be transferred to different support surfaces layer by layer. The TFP-DHF 2D COF membrane supported on an anodic aluminum oxide (AAO) porous support displayed remarkable permeabilities for both polar and nonpolar organic solvents, which were approximately 100 times higher than that of the amorphous membranes prepared by the same procedure and similar to that for the best of the reported polymer membranes. The transport mechanism through the TFP-DHF 2D COF membrane was found to be a viscous flow coupled with a strong slip boundary enhancement, which was also different from those of the amorphous polymer membranes. The membrane exhibited a steep molecular sieving with a molecular weight retention onset (MWRO) of approximately 600 Da and a molecular weight cutoff (MWCO) of approximately 900 Da. The substantial performance enhancement was attributed to the structural change from an amorphous structure to a well-defined ordered porous structure, which clearly demonstrated the high potential for the application of 2D COFs as the next generation of membrane materials.
中文翻译：
用于高通量有机溶剂纳滤的结晶二维共价有机骨架膜
二维 (2D) 共价有机骨架 (COF) 材料具有最适合膜应用的微结构，以实现高通量和高选择性。在这里，我们报告了结晶 TFP-DHF 2D COF 膜的合成，该膜由 1,3,5-三甲酰基间苯三酚 (TFP) 和 9,9-二己基芴-2,7-二胺 (DHF) 的两种前体构成，通过 Langmuir-Blodgett (LB) 方法，首次计时。单个 COF 层正好是四个单元格厚，可以逐层转移到不同的支撑表面。负载在阳极氧化铝 (AAO) 多孔载体上的 TFP-DHF 2D COF 膜对极性和非极性有机溶剂均显示出显着的渗透性，这比通过相同程序制备的无定形膜高约 100 倍，并且与报道的最好的聚合物膜相似。发现通过 TFP-DHF 2D COF 膜的传输机制是粘性流加上强烈的滑动边界增强，这也不同于无定形聚合物膜的传输机制。该膜表现出陡峭的分子筛分，起始分子量 (MWRO) 约为 600 Da，截留分子量 (MWCO) 约为 900 Da。显着的性能提升归因于从无定形结构到定义明确的有序多孔结构的结构变化，这清楚地表明了二维 COF 作为下一代膜材料应用的巨大潜力。
更新日期：2018-10-05
中文翻译：
用于高通量有机溶剂纳滤的结晶二维共价有机骨架膜
二维 (2D) 共价有机骨架 (COF) 材料具有最适合膜应用的微结构，以实现高通量和高选择性。在这里，我们报告了结晶 TFP-DHF 2D COF 膜的合成，该膜由 1,3,5-三甲酰基间苯三酚 (TFP) 和 9,9-二己基芴-2,7-二胺 (DHF) 的两种前体构成，通过 Langmuir-Blodgett (LB) 方法，首次计时。单个 COF 层正好是四个单元格厚，可以逐层转移到不同的支撑表面。负载在阳极氧化铝 (AAO) 多孔载体上的 TFP-DHF 2D COF 膜对极性和非极性有机溶剂均显示出显着的渗透性，这比通过相同程序制备的无定形膜高约 100 倍，并且与报道的最好的聚合物膜相似。发现通过 TFP-DHF 2D COF 膜的传输机制是粘性流加上强烈的滑动边界增强，这也不同于无定形聚合物膜的传输机制。该膜表现出陡峭的分子筛分，起始分子量 (MWRO) 约为 600 Da，截留分子量 (MWCO) 约为 900 Da。显着的性能提升归因于从无定形结构到定义明确的有序多孔结构的结构变化，这清楚地表明了二维 COF 作为下一代膜材料应用的巨大潜力。
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