Pebax-based composite hollow fibre membranes are promising candidates for industrial gas separation, but their application is limited by the inherent separation performance of the polymeric materials and the poor operational stability especially under elevated pressures. The incorporation of metal–organic frameworks (MOFs) has been extensively investigated as a potential solution to these problems. However, the major challenges are to control the microvoids in the interfacial region and to improve the effective MOF loading within the selective layer. In this work, we applied a zirconium-based rigid MOF (UiO-66) to fabricate a nanocomposite hollow fibre membrane, and (–COOH) and (–NH₂) modified UiO-66 were applied to investigate the effect of surface functionalization. Up to 80 wt% UiO-66 was incorporated into the thin Pebax selective layer, and both improved CO₂ permeance and selectivity were obtained simultaneously with the (–NH) functionalized UiO-66. In addition, the presence of UiO-66 in Pebax significantly improved the membrane's operational stability under high pressure.

中文翻译：

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表面功能化的UiO-66 / Pebax基超薄复合中空纤维气体分离膜

基于Pebax的复合中空纤维膜是工业气体分离的理想选择，但其应用受到聚合物材料固有的分离性能以及不良的操作稳定性（特别是在高压下）的限制。金属-有机框架（MOFs）的结合已被广泛研究作为解决这些问题的潜在方法。然而，主要的挑战是控制界面区域中的微孔并提高选择性层内的有效MOF负载。在这项工作中，我们应用了基于锆的刚性MOF（UiO-66）来制造纳米复合中空纤维膜，以及（–COOH）和（–NH ₂）改性UiO-66用于研究表面功能化的效果。最多80 wt％的UiO-66被掺入了Pebax薄选择层中，并且与（-NH）官能化的UiO-66同时获得了改善的CO ₂渗透性和选择性。另外，在Pebax中UiO-66的存在显着提高了膜在高压下的操作稳定性。