Abstract:

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.

Key words: ZIFs particles, membranes, PDMDES, pervaporation, recovery

摘要：

共混基质膜是提升聚合物膜分离性能的有效策略，其中ZIFs材料被视为理想的填充颗粒。为了获得性能更好的渗透汽化膜，希望通过在PDMDES聚合物内添加ZIFs颗粒制备高分离性能的共混基质膜。首先，制备了ZIF-8、ZIF-90及ZIF-8-90颗粒，并通过红外光谱表征方法证实了ZIFs颗粒的成功合成，随后，在PDMDES聚合物中填充ZIFs颗粒，制备了三种不同的ZIFs/PDMDES共混基质膜，并考察了这些共混基质膜的形貌、表面疏水性能以及渗透汽化特性。研究发现，ZIFs颗粒的加入不仅增加了膜的厚度，还显著提升了膜表面的疏水性能，与纯PDMDES膜相比，这些共混膜在渗透汽化性能上得到了显著的提升。在新制备的三种膜中，ZIF-8-90/PDMDES共混基质膜表现了最佳的综合性能，在60℃条件下分离5%（质量分数）乙醇水溶液时，展现出了卓越的分离效果，渗透通量达到8651.7g/(m²∙h)，分离因子达到8.87。

关键词: 沸石咪唑酯骨架颗粒, 膜, 聚二甲基二乙氧基硅烷, 渗透汽化, 回收