title: Tuning the Interplay between Selectivity and Permeability of ZIF-7 Mixed Matrix Membranes.
abstract: Nanoparticles of zeolitic imidazolate framework-7 (nZIF-7) were blended with poly(ether imide) (PEI) to fabricate a new mixed-matrix membrane (nZIF-7/PEI). nZIF-7 was chosen in order to demonstrate the power of postsynthetic modification (PSM) by linker exchange of benzimidazolate to benzotriazolate for tuning the permeability and selectivity properties of a resulting membrane (PSM-nZIF-7/PEI). These two new membranes were subjected to constant volume, variable pressure gas permeation measurements (H2, N2, O2, CH4, CO2, C2H6, and C3H8), in which unique gas separation behavior was observed when compared to the pure PEI membrane. Specifically, the nZIF-7/PEI membrane exhibited the highest selectivities for CO2/CH4, CO2/C2H6, and CO2/C3H8gas pairs. Furthermore, PSM-nZIF-7/PEI membrane displayed the highest permeabilities, which resulted in H2/CH4, N2/CH4, and H2/CO2permselectivities that are remarkably well-positioned on the Robeson upper bound curves, thus, indicating its potential applicability for use in practical gas purifications.
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Bassem A
authors.initials: BA
authors.lastname: Al-Maythalony
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Ahmed M
authors.initials: AM
authors.lastname: Alloush
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Muhammed
authors.initials: M
authors.lastname: Faizan
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Hatim
authors.initials: H
authors.lastname: Dafallah
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Mohammed A A
authors.initials: MAA
authors.lastname: Elgzoly
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Adam A A
authors.initials: AAA
authors.lastname: Seliman
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Amir
authors.initials: A
authors.lastname: Al-Ahmed
authors.affiliation: Center for Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Zain H
authors.initials: ZH
authors.lastname: Yamani
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.
authors.forename: Mohamed A M
authors.identifier: http://orcid.org/0000-0003-3459-1462
authors.initials: MAM
authors.lastname: Habib
authors.affiliation: Center for Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.|Department of Chemistry, Kavli Energy NanoSciences Institute at Berkeley, and Berkeley Global Science Institute, University of California-Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Kyle E
authors.initials: KE
authors.lastname: Cordova
authors.affiliation: King Abdulaziz City for Science and Technology-Technology Innovation Center on Carbon Capture and Sequestration (KACST-TIC on CCS), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.|Center for Research Excellence in Nanotechnology (CENT), King Fahd University of Petroleum and Minerals , Dhahran 31261, Saudi Arabia.|Department of Chemistry, Kavli Energy NanoSciences Institute at Berkeley, and Berkeley Global Science Institute, University of California-Berkeley , Berkeley, California 94720, United States.|Materials Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Omar M
authors.identifier: http://orcid.org/0000-0002-5611-3325
authors.initials: OM
authors.lastname: Yaghi
keywords: gas separation; metal−organic frameworks; mixed-matrix membranes; nanomaterials; zeolitic imidazolate frameworks