Fan Shu-Ting, Qiu Zhen-Jiang, Xu Ruo-Yu, Zhang Shao-Xia, Chen Zhi-Hui, Nie Zi-Jun, Shu Hao-Ran, Guo Kun, Zhang Sheng, Li Bang-Jing
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Sichuan University, Chengdu 610065, China.
Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
ACS Appl Mater Interfaces. 2021 Mar 24;13(11):13034-13043. doi: 10.1021/acsami.0c18861. Epub 2021 Mar 15.
Mixed matrix membranes (MMMs) for CO separation have overcome the trade-off between gas permeability and gas selectivity to some extent. However, most MMMs still are prepared in lab- and pilot-scales since the permeability and selectivity of CO are not good enough to reach the economically available requirements. Moreover, the fabrication of few MMMs with good separation performance is time-consuming or need harsh conditions. In this study, a novel MOF-based composite membrane (PAN-γ-CD-MOF-PU membrane) was successfully fabricated by a facile and fast spin-coating method. In the two-step coating process, we applied a uniform selective layer of γ-cyclodextrin-MOF (γ-CD-MOF) on porous polyacrylonitrile and then coated a layer of polyurethane on the γ-CD-MOF layer. The entire membrane formation process was about 30 s. The formation of a unique γ-CD-MOF layer greatly improved the separation ability of CO (the CO permeability is 70.97 barrers; the selectivity to CO/N and CO/O are 253.46 and 154.28, respectively). The gas separation performance can exceed the Robeson upper limit obviously and the selectivity is better than other MOF-based composite membranes. In addition, the PAN-γ-CD-MOF-PU membrane is strong and flexible. Therefore, the PAN-γ-CD-MOF-PU membrane developed in this study has great potential in large-scale industrial separation of CO.
用于CO分离的混合基质膜（MMMs）在一定程度上克服了气体渗透率和气体选择性之间的权衡。然而，大多数MMMs仍在实验室和中试规模制备，因为CO的渗透率和选择性不够好，无法达到经济上可行的要求。此外，制备少数具有良好分离性能的MMMs耗时或需要苛刻条件。在本研究中，通过简便快速的旋涂法成功制备了一种新型的基于金属有机框架（MOF）的复合膜（PAN-γ-CD-MOF-PU膜）。在两步涂覆过程中，我们在多孔聚丙烯腈上涂覆了一层均匀的γ-环糊精-MOF（γ-CD-MOF）选择性层，然后在γ-CD-MOF层上涂覆了一层聚氨酯。整个膜形成过程约为30秒。独特的γ-CD-MOF层的形成大大提高了CO的分离能力（CO渗透率为70.97巴雷尔；对CO/N和CO/O的选择性分别为253.46和154.28）。气体分离性能明显超过罗伯逊上限，选择性优于其他基于MOF的复合膜。此外，PAN-γ-CD-MOF-PU膜坚固且柔韧。因此，本研究开发的PAN-γ-CD-MOF-PU膜在大规模工业CO分离中具有巨大潜力。
