We have systematically synthesized a series of functionalized UiO-66-X (X = NO 2 , NH 2 , Cl, Br, I, Br 2 ) compounds to further improve the selective SF 6 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 SF 6 and CF 4 adsorption, especially at low pressures, which is the industrially relevant condition. UiO-66-Br 2 with the highest polarizability exhibited a high Henry's constant (104 mmol g −1 bar −1 ) for SF 6 adsorption as well as high SF 6 /N 2 selectivity (2 0 0), both of which are considerably higher than those of other adsorbent materials, including MOFs. Moreover, UiO-66-Br 2 showed good SF 6 /N 2 separation under a dynamic mixture flow condition as well as facile regeneration without increasing the temperature. These results show that UiO-66-Br 2 is a potential adsorbent for the selective capture of SF 6 from various SF 6 /N 2 mixtures in industry.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering