Rajpure Manoj M, Mujmule Rajendra B, Kim Uisik, Kim Hern
Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do 17058, Republic of Korea.
KEPCO Research Institute, Korea Electric Power Corporation, Daejeon 34056, Republic of Korea.
Chemosphere. 2025 Apr;374:144183. doi: 10.1016/j.chemosphere.2025.144183. Epub 2025 Feb 10.
ZIF-8-based mixed matrix membranes are most used for selective gas separation due to their obvious molecular sieving properties. However, their application remains challenging due to their incompatibility with polymer matrix. In this study, we introduced the AZIF-8 nanoparticles synthesized via partial substitution of 2-methyl imidazole (2-Mim) ligand by 3-amino-1, 2, 4-triazole (Atz) to finely tune the aperture and increase gas separation performance of MMMs. The integration of Atz ligand significantly enhances particle dispersion and compatibility with polymer. Different ligand substitution times and loadings were applied to investigate the gas separation performance. The experimental results reveal that the Atz modified ZIF-8 (AZIF-8) blended CA MMMs with 1 wt% loading showed the high separation activity. The AZIF-8/CA (A = 8 h) is able to achieve high H and CO permeability values of 183.5 and 135.0 Barrer, respectively, with ideal selectivity of 49.1 and 36.1 for H/CH and CO/CH, respectively, under the 0.4 MPa feed pressure. Remarkably, the gas separation activity of Atz modified ZIF-8 MMMs lies very close to the Robeson upper bound 2008, signifying the effectiveness of the reported modification strategy.
基于ZIF-8的混合基质膜因其明显的分子筛特性而最常用于选择性气体分离。然而，由于它们与聚合物基质不相容，其应用仍然具有挑战性。在本研究中，我们引入了通过用3-氨基-1,2,4-三唑（Atz）部分取代2-甲基咪唑（2-Mim）配体合成的AZIF-8纳米颗粒，以精细调节孔径并提高混合基质膜的气体分离性能。Atz配体的引入显著增强了颗粒分散性以及与聚合物的相容性。应用不同的配体取代时间和负载量来研究气体分离性能。实验结果表明，负载量为1 wt%的Atz改性ZIF-8（AZIF-8）共混CA混合基质膜表现出高分离活性。在0.4 MPa进料压力下，AZIF-8/CA（A = 8 h）能够分别实现183.5和135.0 Barrer的高H₂和CO₂渗透率值，对H₂/CH₄和CO₂/CH₄的理想选择性分别为49.1和36.1。值得注意的是，Atz改性ZIF-8混合基质膜的气体分离活性非常接近2008年的Robeson上限，这表明所报道的改性策略是有效的。
