Abstract Incorporating metal-organic frameworks (MOFs) into polymer to fabricate hybrid membranes is an effective approach of breaking the trade-off between permeability and selectivity. In this study, hollow zeolitic imidazolate framework-8 (HZIF-8) nanospheres were prepared and blended into sodium alginate (SA) matrix to fabricate water-selective hybrid membrane, which intensify the diffusion process of water molecules dramatically owing to their well-designed hierarchical structures. The micropores on HZIF-8 nanosphere shell have a molecular sieving effect, which enhances diffusion selectivity of water molecules. The hollow structure of HZIF-8 nanospheres ensures the rapid diffusion of water molecules, thus elevating the permeation flux and separation factor simultaneously. Besides, the intervention effects of HZIF-8 nanospheres on the SA chain packing also contribute to the enhancement of permeation flux and separation factor by rendering the membrane more free volume cavities and suitable free volume cavity size for ethanol/water separation. When utilized to separate 90 wt% ethanol aqueous solution at 76 °C, the hybrid membrane containing 6 wt% HZIF-8 displays the highest separation performance with permeation flux of 2485 g/m2 h and separation factor of 1884, much superior to those for pure SA membrane and the hybrid membranes incorporating zeolitic imidazolate framework-8 (ZIF-8) nanocrystals. Desirable long-term stability of the hybrid membranes was also acquired.

中文翻译：

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包含多功能中空 ZIF-8 纳米球的混合膜中的水选择性渗透

摘要 将金属有机骨架 (MOF) 结合到聚合物中来制造杂化膜是打破渗透性和选择性之间权衡的有效方法。在这项研究中，制备了空心沸石咪唑酯骨架 8 (HZIF-8) 纳米球并将其混合到海藻酸钠 (SA) 基质中以制造水选择性杂化膜，由于其精心设计，显着增强了水分子的扩散过程。层次结构。HZIF-8纳米球壳上的微孔具有分子筛分作用，提高了水分子的扩散选择性。HZIF-8纳米球的中空结构保证了水分子的快速扩散，从而同时提高了渗透通量和分离因子。除了，HZIF-8 纳米球对 SA 链堆积的干预作用也有助于提高渗透通量和分离因子，通过使膜具有更多的自由体积腔和适合乙醇/水分离的自由体积腔尺寸。当用于在 76 °C 下分离 90 wt% 乙醇水溶液时，含有 6 wt% HZIF-8 的混合膜表现出最高的分离性能，渗透通量为 2485 g/m2 h，分离因子为 1884，远优于那些纯SA膜和包含沸石咪唑酯骨架-8（ZIF-8）纳米晶体的混合膜。还获得了混合膜所需的长期稳定性。