具有高度分散的ZIF-8@碳纳米管的Pebax混合基质膜用于增强CO/N分离
Pebax Mixed-Matrix Membrane with Highly Dispersed ZIF-8@CNTs to Enhance CO/N Separation.
作者信息
Zhang Yahui, Tong Yuping, Li Xinyu, Guo Shoujie, Zhang Hailong, Chen Xi, Cai Kun, Cheng Linghe, He Weiwei
机构信息
School of Materials and Engineering, North China University of Water Resources and Electric Power, 36 Beihuan Road, Zhengzhou 450045, Henan, P. R. China.
Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province, Institute of Surface Micro and Nano Materials, College of Chemical and Materials Engineering, Xuchang University, 88 Bayi Road, Xuchang 461000, Henan, P. R. China.
出版信息
ACS Omega. 2021 Jul 13;6(29):18566-18575. doi: 10.1021/acsomega.1c00493. eCollection 2021 Jul 27.
In this work, zeolitic imidazolate frameworks (ZIF-8) and carboxylated carbon nanotubes (CNTs) were compounded to prepare a kebab-like one-dimensional linear composite, ZIF-8@CNTs. The mixed-matrix membrane (MMM) for separating carbon dioxide is prepared by embedding it into the polymer matrix Pebax-1657. The results indicated the successful synthesis of the ZIF-8@CNT composite. The combination of ZIF-8 and carboxylated CNTs avoided the aggregation of ZIF-8 in the polymer, increased the free volume of the MMM, and enhanced the CO adsorption performance and CO/N separation performance. In addition, the interaction between CNTs and ZIF-8 provided a fast transport channel for CO molecules and improved the mechanical properties of the MMM. The 5 wt % ZIF-8@CNT MMM showed the best separation performance with a CO permeability of 225.5 Barrer and a CO/N selectivity of 48.9, which exceeded the Robeson upper limit in 2008. The combination of high permeability and selectivity made Pebax/ZIF-8@CNT MMMs promising for industrial CO separation applications.
在本工作中，将沸石咪唑酯骨架材料（ZIF-8）与羧基化碳纳米管（CNTs）复合，制备出了串状一维线性复合材料ZIF-8@CNTs。通过将其嵌入聚合物基质Pebax-1657中来制备用于分离二氧化碳的混合基质膜（MMM）。结果表明成功合成了ZIF-8@CNT复合材料。ZIF-8与羧基化CNTs的结合避免了ZIF-8在聚合物中的聚集，增加了MMM的自由体积，并提高了CO吸附性能和CO/N2分离性能。此外，CNTs与ZIF-8之间的相互作用为CO分子提供了快速传输通道，并改善了MMM的机械性能。5 wt% ZIF-8@CNT MMM表现出最佳的分离性能，CO渗透率为225.5 Barrer，CO/N2选择性为48.9，超过了2008年的Robeson上限。高渗透率和选择性的结合使得Pebax/ZIF-8@CNT MMM在工业CO分离应用中具有前景。
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