Kinetics of bismuth-based metal-organic frameworks for CO2 separation

https://doi.org/10.1016/j.micromeso.2021.111548

“The diffusion of CO₂ in UU-200 and the selected Bi-MOFs were studied using a gravimetric method at 303 K (Fig. 8 and Fig. S20). The adsorption of CO₂ was observed to occur rapidly in all materials, with more than 50% of the total uptake being reached within the first 3 min (Table 3). Even though the crystallographic pore size of UU-200 was found be very close to the kinetic diameter of CO₂, the observed CO₂ adsorption rate on UU-200 still appeared to be both scientific and possibly industrially relevant. Similar findings have also been observed for the CO₂ adsorption in other microporous materials with comparably narrow pores [73]. The CO₂ adsorption kinetics were found to be slower in the trimesate-based UU-200 and CAU-17 MOFs than in CAU-33 and SU-101. This observation could be attributed to both a structural difference and a difference in the particle size between the samples as can be seen in the SEM images of the materials (Figs. S10–S11).”

“Fig. 8. Gravimetric CO₂ adsorption profiles for UU-200, CAU-17, CAU-33, and SU-100, using approximately 5 mg of sample.”