Papchenko Kseniya, Risaliti Giulio, Ferroni Matteo, Christian Meganne, De Angelis Maria Grazia
Department of Civil, Chemical Environmental and Materials Engineering, DICAM, University of Bologna, Via Terracini 28, 40131 Bologna, Italy.
CNR-IMM Section of Bologna, Via Gobetti 101, 40129 Bologna, Italy.
Membranes (Basel). 2021 Jun 4;11(6):427. doi: 10.3390/membranes11060427.
The transport of H, He, CO, O, CH, and N at three temperatures up to 65 °C was measured in dense, thick composite films formed by amorphous Polysulfone (PSf) and particles of the size-selective zeolitic imidazolate framework 8 (ZIF-8) at loadings up to 16 wt%. The morphological and structural properties of the membranes were analyzed via SEM and density measurement. The addition of ZIF-8 to PSf enhances the H and He permeabilities up to 480% with respect to the pure polymer, while the ideal H/CO and He/CO selectivities of MMMs reach values up to 30-40% higher than those of pure PSf. The relative permeability and diffusivity enhancements are higher than those obtained in other polymers, such as PPO, with the same amount of filler. The Maxwell-Wagner-Sillars model is able to represent the MMM H/CO separation performance for filler volume fractions below 10%.
在高达65°C的三种温度下，对由非晶态聚砜（PSf）和尺寸选择性沸石咪唑酯骨架8（ZIF-8）颗粒形成的致密厚复合膜中H、He、CO、O、CH和N的传输进行了测量，ZIF-8的负载量高达16 wt%。通过扫描电子显微镜（SEM）和密度测量对膜的形态和结构性质进行了分析。相对于纯聚合物，向PSf中添加ZIF-8可使H和He的渗透率提高480%，而混合基质膜（MMM）的理想H/CO和He/CO选择性比纯PSf的选择性高出30-40%。在相同填料用量的情况下，相对渗透率和扩散率的提高高于在其他聚合物（如聚苯醚（PPO））中获得的提高。麦克斯韦-瓦格纳-西拉斯模型能够表示填料体积分数低于10%时MMM的H/CO分离性能。
