Fuoco Alessio, Khdhayyer Muhanned R, Attfield Martin P, Esposito Elisa, Jansen Johannes C, Budd Peter M
Institute on Membrane Technology, ITM-CNR, Via P. Bucci 17/C, Rende (CS) 87036, Italy.
School of Chemistry, University of Manchester, Manchester M13 9PL, UK.
Membranes (Basel). 2017 Feb 11;7(1):7. doi: 10.3390/membranes7010007.
Metal-organic frameworks (MOFs) were supported on polymer membrane substrates for the fabrication of composite polymer membranes based on unmodified and modified polymer of intrinsic microporosity (PIM-1). Layers of two different MOFs, zeolitic imidazolate framework-8 (ZIF-8) and Copper benzene tricarboxylate ((HKUST-1), were grown onto neat PIM-1, amide surface-modified PIM-1 and hexamethylenediamine (HMDA) -modified PIM-1. The surface-grown crystalline MOFs were characterized by a combination of several techniques, including powder X-ray diffraction, infrared spectroscopy and scanning electron microscopy to investigate the film morphology on the neat and modified PIM-1 membranes. The pure gas permeabilities of He, H₂, O₂, N₂, CH₄, CO₂ were studied to understand the effect of the surface modification on the basic transport properties and evaluate the potential use of these membranes for industrially relevant gas separations. The pure gas transport was discussed in terms of permeability and selectivity, highlighting the effect of the MOF growth on the diffusion coefficients of the gas in the new composite polymer membranes. The results confirm that the growth of MOFs on polymer membranes can enhance the selectivity of the appropriately functionalized PIM-1, without a dramatic decrease of the permeability.
金属有机框架材料（MOFs）负载于聚合物膜基材上，用于制备基于未改性和改性的固有微孔聚合物（PIM-1）的复合聚合物膜。将两种不同的MOF，即沸石咪唑酯骨架-8（ZIF-8）和苯三甲酸铜（HKUST-1），生长在纯PIM-1、酰胺表面改性的PIM-1和六亚甲基二胺（HMDA）改性的PIM-1上。通过粉末X射线衍射、红外光谱和扫描电子显微镜等多种技术相结合的方式对表面生长的结晶MOF进行表征，以研究纯PIM-1膜和改性PIM-1膜上的膜形态。研究了He、H₂、O₂、N₂、CH₄、CO₂的纯气体渗透率，以了解表面改性对基本传输性能的影响，并评估这些膜在工业相关气体分离中的潜在应用。从渗透率和选择性方面讨论了纯气体传输，突出了MOF生长对新复合聚合物膜中气体扩散系数的影响。结果证实，MOF在聚合物膜上的生长可以提高适当功能化的PIM-1的选择性，而不会显著降低渗透率。
