全渗透金属有机框架ZIF-95@Matrimid®混合基质膜取向构筑及CO2分离性能研究

混合基质膜兼有无机膜和有机膜的优点，在CO2脱除等化工分离中发挥着越来越重要的作用。但无机多孔填料通常完全被高分子聚合物基质包覆，未能充分发挥多孔填料的分子筛分功能，导致混合基质膜的选择性和渗透性都受到极大限制。本项目提出对混合基质膜的微观结构进行调控，构筑出具有取向结构和全渗透特性的金属有机框架ZIF-95@Matrimid®混合基质膜用于CO2的分离和脱除。ZIF-95纳米片高度取向、上下相通地镶嵌在聚合物Matrimid®基质中，从而充分发挥ZIF-95孔道的分子筛分作用，大大提高混合基质膜的CO2选择分离性能。详细考察ZIF-95颗粒形貌、大小和掺入量以及铸膜液浓度等因素对ZIF-95@Matrimid®混合基质膜微观结构和分离性能的影响，深入探讨膜微观结构和分离性能的构效关系；进而揭示CO2等渗透分子在ZIF-95@Matrimid®混合基质膜中的吸附、扩散行为规律和传输机制。

Mixed matrix membranes (MMMs), with both advantages of inorganic membranes and organic membranes, play an increasingly important role in chemical separation such as CO2 removal. However, inorganic porous fillers are usually completely covered by polymer matrix, which can not fully play a molecular sieving role of the porous fillers, resulting in the great limitation of the selectivity and permeability of mixed matrix membrane. In this project, it is proposed to control the microstructure of the mixed matrix membrane, and build a metal organic framework ZIF-95@Matrimid® mixed matrix membrane with orientation structure and full permeability characteristics for the separation and removal of CO2. ZIF-95 nano-sheets are highly oriented and interlinked in the polymer Matrimid® matrix, so as to fullly play the molecular sieving effect of ZIF-95 pores and greatly improve the CO2 selective separation performance of the mixed matrix membrane. The effects of zif-95 particle morphology, size, amount of incorporation as well as concentration of casting solution on the microstructure and separation performance of the ZIF-95@Matrimid® mixed matrix membrane were investigated in detail, and the structure-activity relationship between the microstructure and separation performance of the membrane was discussed in depth, so as to reveal the adsorption, diffusion behavior and transport mechanism of CO2 in the ZIF-95@Matrimid® mixed matrix membrane.