We have systematically synthesized a series of functionalized UiO-66-X (X = NO2, NH2, Cl, Br, I, Br2) compounds to further improve the selective SF6 adsorption of UiO-66, which is one of the best-performing adsorbents, and to investigate the effect of the polarizability of adsorbent atoms on the SF6 and CF4 adsorption, especially at low pressures, which is the industrially relevant condition. UiO-66-Br2 with the highest polarizability exhibited a high Henry's constant (104 mmol g−1 bar−1) for SF6 adsorption as well as high SF6/N2 selectivity (2 0 0), both of which are considerably higher than those of other adsorbent materials, including MOFs. Moreover, UiO-66-Br2 showed good SF6/N2 separation under a dynamic mixture flow condition as well as facile regeneration without increasing the temperature. These results show that UiO-66-Br2 is a potential adsorbent for the selective capture of SF6 from various SF6/N2 mixtures in industry.
Bibliographical noteFunding Information:
This work was supported by “Next Generation Carbon Upcycling Project” (Project No. 2017M1A2A2043449) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea and the Technology Innovation Program (10048649) funded by the Ministry of Trade, Industry & Energy (MI, Korea). Also, this work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (No. NRF-2017M2A8A5019344). Appendix A
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All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering