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1. Adsorption of Carbon Dioxide, Methane, and Nitrogen Gases onto ZIF Compounds with Zinc, Cobalt, and Zinc/Cobalt Metal Centers

   https://doi.org/10.1155/2019/6130152  

   Awadallah-F, Ahmed ; Hillman, Febrian ; Al-Muhtaseb, Shaheen A. ; Jeong, Hae-Kwon ( December 2019 , Journal of Nanomaterials)

   ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 are utilized in adsorbing nitrogen (N 2 ), methane (CH 4 ), and carbon dioxide (CO 2 ) gases at temperatures between 25 and 55°C and pressures up to ~1 MPa. Equilibrium adsorption isotherms and adsorption kinetics are studied. The dual-site Langmuir equation is employed to correlate the nonisothermal adsorption equilibrium behavior. Generally, N 2 showed the lowest equilibrium adsorption quantity on the three samples, whereas CO 2 showed the highest equilibrium adsorption capacity. Amid the ZIF samples, the biggest adsorption quantities of N 2 and CH 4 were onto Zn/Co-ZIF-8, whereas the highest adsorption quantity ofmore »CO 2 was on ZIF-8. The isosteric heats of adsorbing these gases on ZIF-8, Co-ZIF-8, and Zn/Co-ZIF-8 were examined. Moreover, the overall mass transfer coefficients of adsorption at different temperatures were investigated.« less
2. Polyimide/ZIF-7 mixed-matrix membranes: understanding the in situ confined formation of the ZIF-7 phases inside a polymer and their effects on gas separations

   https://doi.org/10.1039/d0ta02761h  

   Park, Sunghwan ; Cho, Kie Yong ; Jeong, Hae-Kwon ( June 2020 , Journal of Materials Chemistry A)

   Polymer-modification-enabled in situ metal–organic framework formation (PMMOF) is potentially a paradigm-shifting preparation method for polymer/MOF mixed-matrix membranes (MMMs). However, the actual reaction conditions of the in situ formation of MOFs in a confined polymer free volume are expected to be quite different from that in a bulk solution. ZIF-7 is an interesting filler material not only due to its use in selective light gas separations but also for its three different crystal phases. Herein, we carried out systematic investigations on the in situ confined formation of ZIF-7 phases inside a polymer (6FDA-DAM) by PMMOF. The reaction conditions of ZIF-7 inmore »the polymer free volume were deduced based on a bulk-phase ZIF-7 phase diagram constructed by varying the ZIF-7 precursor concentrations and ratios. Based on the understanding of the reaction conditions, the ZIF-7 crystal phases formed inside the polymer during the PMMOF process were controlled, yielding 6FDA-DAM/ZIF-7 MMMs with three different crystal phases. The ZIF-7 phases had significant effects on the gas transport of MMMs with layered ZIF-7-III fillers exhibiting the highest performance enhancement for H 2 /CO 2 separation ( i.e. , H 2 permeability of ∼1630 Barrer and H 2 /CO 2 selectivity of ∼3.8) among other phases. Furthermore, the MMMs obtained by the PMMOF process showed enhanced H 2 /CO 2 separation performance, surpassing the upper bound.« less
3. Plasma-Induced Catalytic Conversion of Nitrogen and Hydrogen to Ammonia over Zeolitic Imidazolate Frameworks ZIF-8 and ZIF-67

   https://doi.org/doi.org/10.1021/acsami.1c03115.s001  

   Fnu Gorky, Jolie M. ( April 2021 , ACS applied materials interfaces)

   Microporous crystals have emerged as highly appealing catalytic materials for the plasma catalytic synthesis of ammonia. Herein, we demonstrate that zeolitic imidazolate frameworks (ZIFs) can be employed as efficient catalysts for the cold plasma ammonia synthesis using an atmospheric dielectric barrier discharge reactor. We studied two prototypical ZIFs denoted as ZIF-8 and ZIF-67, with a uniform window pore aperture of 3.4 Å. The resultant ZIFs displayed ammonia synthesis rates as high as 42.16 μmol NH3/min gcat. ZIF-8 displayed remarkable stability upon recycling. The dipole–dipole interactions between the polar ammonia molecules and the polar walls of the studied ZIFs led tomore »relatively low ammonia uptakes, low storage capacity, and high observed ammonia synthesis rates. Both ZIFs outperform other microporous crystals including zeolites and conventional oxides in terms of ammonia production. Furthermore, we demonstrate that the addition of argon to the reactor chamber can be an effective strategy to improve the plasma environment. Specifically, the presence of argon helped to improve the plasma uniformity, making the reaction system more energy efficient by operating at a low specific energy input range allowing abundant formation of nitrogen vibrational species.« less
4. Two Distinct Stages of Structural Modification of ZIF-L MOF under Electron-Beam Irradiation

   https://doi.org/10.1021/acs.chemmater.1c01332  

   Ghosh, Supriya ; Yun, Hwanhui ; Kumar, Prashant ; Conrad, Sabrina ; Tsapatsis, Michael ; Mkhoyan, K. Andre ( July 2021 , Chemistry of Materials)
5. ZIF-8 degrades in cell media, serum, and some—but not all—common laboratory buffers

   https://doi.org/10.1080/10610278.2019.1616089  

   Luzuriaga, Michael A. ; Benjamin, Candace E. ; Gaertner, Michael W. ; Lee, Hamilton ; Herbert, Fabian C. ; Mallick, Snipta ; Gassensmith, Jeremiah J. ( June 2019 , Supramolecular Chemistry)