用双源播种法轻松控制 MOF-303 中空纤维膜的取向

IF 14.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Communications Pub Date : 2024-11-26 DOI:10.1038/s41467-024-54730-z
Mengjiao Zhai, Farhad Moghadam, Tsaone Gosiamemang, Jerry Y. Y. Heng, Kang Li
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引用次数: 0

摘要

金属有机框架(MOFs)是一种纳米多孔结晶材料,具有进一步发展成为新型高性能膜的巨大潜力。然而,制备具有高过选择性和良好结构完整性的无缺陷、水稳定 MOF 膜仍然是一项挑战。在此,我们展示了一种双源播种(DS)方法,用于制备具有中空纤维(HF)几何形状和优先定制晶体取向的高性能水稳定 MOF-303 膜。通过控制二次生长过程中的成核点密度,制备出了在 (011) 平面上具有优选晶体取向 (CPO) 的 MOF-303 膜。在 (011) 面上具有 CPO 的 MOF-303 膜提供了笔直的一维渗透通道,在过气水/乙醇分离中具有 18 kg m-2 h-1 的优异水通量,高于大多数已报道的沸石膜,比之前报道的 MOF 膜高出 1-2 个数量级。直透水通道的透水率也有望达到 15 L m-2 h-1 bar-1,并且分子量截止值(MWCO ≈ 269)可用于染料纳滤。这些结果为开发具有良好选择性和结构完整性的超渗透 MOF 膜提供了概念,可用于渗透和纳滤。
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Facile orientation control of MOF-303 hollow fiber membranes by a dual-source seeding method

Metal‒organic frameworks (MOFs) are nanoporous crystalline materials with enormous potential for further development into a new class of high-performance membranes. However, the preparation of defect-free and water-stable MOF membranes with high permselectivity and good structural integrity remains a challenge. Herein, we demonstrate a dual-source seeding (DS) approach to produce high-performance, water-stable MOF-303 membranes with hollow fiber (HF) geometry and preferentially tailored crystallographic orientation. By controlling the nucleation site density during secondary growth, MOF-303 membranes with a preferred crystallographic orientation (CPO) on the (011) plane were fabricated. The MOF-303 membrane with CPO on (011) provides straight one-dimensional permeation channels with a superior water flux of 18 kg m−2 h−1 in pervaporative water/ethanol separation, which is higher than that of most of the reported zeolite membranes and 1–2 orders of magnitude greater than that of previously reported MOF membranes. The straight water permeation channels also offer a promising water permeance of 15 L m−2 h−1 bar−1 and a molecular weight cut-off (MWCO ≈ 269) for dye nanofiltration. These results provide a concept for developing ultrapermeable MOF membranes with good selectivity and structural integrity for pervaporation and nanofiltration.

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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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