Fabrication of Crystalline Microporous Membrane from 2D MOF Nanosheets for Gas Separation
Shuangshuang Jiang, Xinli Shi, Fuxing Sun, Guangshan Zhu
Abstract
Abstract Metal‐organic frameworks (MOFs)‐based membranes have shown great potentials as applications in gas separation. In this work, a uniform membrane based on 2D MOF Ni 3 (HITP) 2 (HITP=2,3,6,7,10,11‐hexaaminotriphenylene) was fabricated on ordered macroporous AAO via the filtration method. To fabricate the membrane, we obtained the Ni 3 (HITP) 2 nanosheets as building blocks via a soft‐physical exfoliation method successfully that were confirmed by AFM and TEM. We also studied the H 2 , CO 2 and N 2 adsorption isotherms of Ni 3 (HITP) 2 powder at room temperature, which shows Ni 3 (HITP) 2 has high heats of adsorption for CO 2 and high selectivity of CO 2 over N 2 . Gas permeation tests indicate that the Ni 3 (HITP) 2 membrane shows high permeance and selectivity of CO 2 over N 2 , as well as good selectivity of H 2 over N 2 . The ideal separation factors of CO 2 /N 2 and H 2 /N 2 from sing‐gas permeances are 13.6 and 7.8 respectively, with CO 2 permeance of 3.15×10 −6 mol⋅m −2 ⋅s −1 ⋅Pa −1 . The membrane also showed good stability, durability and reproducibility, which are of potential interest for practical applications in the CO 2 separations.