ZIFs/PDMDES 共混基质膜的制备及其在水溶液中渗透汽化分离乙醇的应用

Mixed matrix membranes (MMMs) serve as an effective strategy to enhance the separation performance of polymeric membranes with zeolitic imidazolate frameworks (ZIFs) materials being considered as ideal filler particles. In pursuit of high-performance pervaporation membranes, this study aimed to fabricate MMMs by incorporating ZIFs particles into the poly-dimethyldiethoxysilane (PDMDES) polymer. Initially, ZIF-8, ZIF-90 and ZIF-8-90 particles were synthesized and their successful synthesis was confirmed by FTIR characterization. These ZIFs particles were then incorporated into the PDMDES polymer to create three distinct ZIFs/PDMDES MMMs. The morphologies, surface hydrophobic properties and pervaporation performance of these MMMs were investigated. The incorporation of ZIFs particles not only increased the membrane thickness but also significantly enhanced surface hydrophobicity, leading to marked improvements in pervaporation performance, as compared to the pure PDMDES membrane. Among these, the ZIF-8-90/PDMDES MMM demonstrated the best overall performance. Specifically, in the separation of a 5% (mass) ethanol aqueous solution at 60℃, it achieved outstanding separation performance, yielding a permeation flux of 8651.7g/(m²∙h) and a separation factor of 8.87.