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Oriented Zeolitic Imidazolate Framework (ZIF) Nanocrystal Films for Molecular Separation Membranes
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-04-02 , DOI: 10.1021/acsanm.0c00570 Shaofei Wang 1 , Jiangtao Liu 1 , Bruno Pulido 1 , Yifan Li 1 , Dinesh Mahalingam 1 , Suzana P. Nunes 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-04-02 , DOI: 10.1021/acsanm.0c00570 Shaofei Wang 1 , Jiangtao Liu 1 , Bruno Pulido 1 , Yifan Li 1 , Dinesh Mahalingam 1 , Suzana P. Nunes 1
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The direct synthesis of oriented, defect-free nanocrystal metal–organic framework (MOF) films is a challenging step toward their applications in advanced technologies, such as optics, sensing, and membrane-based separations. Here, we propose a one-step, in situ growth approach to synthesize oriented zeolitic imidazolate framework-L (ZIF-L) membranes by using an isoporous film as the support. The high metal binding efficiency, as well as the ordered pore structure, given by the polymeric isoporous support, promote the preferred nucleation and rapid growth of vertically aligned ZIF-L nanocrystals to construct dense membranes. Vertically aligned nanochannels between the interlattice of ZIF-L are therefore formed through the polycrystalline membrane. The membrane exhibited a high H2 permeance, 1635 GPU (1 GPU = 1 × 10–6 cm3 (STP)/(cm2 s cmHg)), and H2/C3H8 selectivity of 516, when targeting hydrogen separation from hydrocarbon in a steam reforming process. The membrane can be further used in organic solvent nanofiltrations, with a methanol permeance of 38.7 L m–2 h–1 bar–1 and >90% rejection of organic dye molecules. Furthermore, by taking advantage of the anisotropic pore structure, the ZIF-L membrane could be further hydrolyzed to produce ultrathin ZIF-L nanosheets with a thickness ∼5 nm, which provides a facile platform to synthesize two-dimensional MOFs nanosheets.
中文翻译：
分子筛分离膜的定向沸石咪唑盐骨架（ZIF）纳米晶体薄膜
定向，无缺陷的纳米晶体金属-有机骨架（MOF）膜的直接合成是将其应用到光学，传感和基于膜的分离等先进技术中的一项挑战。在这里，我们提出了一个一步的原位生长方法，以等孔膜为载体，合成定向的沸石咪唑盐骨架-L（ZIF-L）膜。聚合物等孔载体赋予的高金属结合效率以及有序的孔结构，促进了垂直排列的ZIF-L纳米晶体的优选成核和快速生长，从而构成了致密的膜。因此，通过多晶膜在ZIF-L的晶格之间形成垂直排列的纳米通道。膜表现出高H 2在蒸汽重整过程中从烃中分离氢时，磁导率，1635 GPU（1 GPU = 1×10 –6 cm 3（STP）/（cm 2 s cmHg））和H 2 / C 3 H 8选择性为516 。该膜可进一步用于有机溶剂纳米过滤，其甲醇渗透率为38.7 L m –2 h –1 bar –1，有机染料分子的截留率> 90％。此外，通过利用各向异性的孔结构，可以进一步水解ZIF-L膜以生产厚度约5nm的超薄ZIF-L纳米片，这为合成二维MOFs纳米片提供了方便的平台。
更新日期：2020-04-02
中文翻译：
分子筛分离膜的定向沸石咪唑盐骨架（ZIF）纳米晶体薄膜
定向，无缺陷的纳米晶体金属-有机骨架（MOF）膜的直接合成是将其应用到光学，传感和基于膜的分离等先进技术中的一项挑战。在这里，我们提出了一个一步的原位生长方法，以等孔膜为载体，合成定向的沸石咪唑盐骨架-L（ZIF-L）膜。聚合物等孔载体赋予的高金属结合效率以及有序的孔结构，促进了垂直排列的ZIF-L纳米晶体的优选成核和快速生长，从而构成了致密的膜。因此，通过多晶膜在ZIF-L的晶格之间形成垂直排列的纳米通道。膜表现出高H 2在蒸汽重整过程中从烃中分离氢时，磁导率，1635 GPU（1 GPU = 1×10 –6 cm 3（STP）/（cm 2 s cmHg））和H 2 / C 3 H 8选择性为516 。该膜可进一步用于有机溶剂纳米过滤，其甲醇渗透率为38.7 L m –2 h –1 bar –1，有机染料分子的截留率> 90％。此外，通过利用各向异性的孔结构，可以进一步水解ZIF-L膜以生产厚度约5nm的超薄ZIF-L纳米片，这为合成二维MOFs纳米片提供了方便的平台。
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