Wang Ziyang, Wang Wenjian, Zeng Tao, Ma Dan, Zhang Panpan, Zhao Siqi, Yang Li, Zou Xiaoqin, Zhu Guangshan
Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.
Adv Mater. 2022 Feb;34(6):e2104606. doi: 10.1002/adma.202104606. Epub 2021 Dec 16.
The interface is a critical issue for metal-organic-framework hybrid membranes in propylene separation. Here, a covalent-linking strategy is reported for strikingly reinforcing the interfacial compatibility in a ZIF-8-based membrane. A functionalized ZIF-8 material named ZIF-8-CN is synthesized using the mixed-ligand approach. ZIF-8-CN has an identical crystalline structure to ZIF-8, and the 4,5-dicyanoimidazole ligand is available for further functionalization. Covalent linkage of ZIF-8-CN with PIM-1 is driven by the thermal reaction of the cyano groups on both entities, which strengthens the filler-polymer connection in the ZIF-8-CN@tPIM-1 membrane. ZIF-8-CN@tPIM-1 exhibits remarkably enhanced propylene permeation property with C H /C H selectivity of ≈28, which is 350% and 180% higher than those on non-treated ZIF-8-CN/PIM-1 and non-functionalized ZIF-8@tPIM-1, respectively. Additionally, ZIF-8-CN@tPIM-1 shows the highest C H permeability of ≈370 Barrer among all relevant ZIF-8 membranes. This strategy opens an avenue for precise interface engineering in membranes and the resultant high performance is appealing in the propylene separation industry.
对于用于丙烯分离的金属有机骨架杂化膜而言，界面是一个关键问题。在此，报道了一种共价连接策略，用于显著增强基于ZIF-8的膜中的界面相容性。采用混合配体方法合成了一种名为ZIF-8-CN的功能化ZIF-8材料。ZIF-8-CN与ZIF-8具有相同的晶体结构，且4,5-二氰基咪唑配体可用于进一步功能化。ZIF-8-CN与PIM-1之间的共价连接是由两者上氰基的热反应驱动的，这加强了ZIF-8-CN@tPIM-1膜中填料与聚合物的连接。ZIF-8-CN@tPIM-1表现出显著增强的丙烯渗透性能，C₃H₆/C₂H₄选择性约为28，分别比未处理的ZIF-8-CN/PIM-1和未功能化的ZIF-8@tPIM-1高350%和180%。此外，在所有相关的ZIF-8膜中，ZIF-8-CN@tPIM-1显示出最高的C₃H₆渗透率，约为370 Barrer。该策略为膜的精确界面工程开辟了一条途径，所得到的高性能在丙烯分离行业中具有吸引力。
