Abstract
Bismuth-based metal-organic frameworks (Bi-MOFs) such as bismuth subgallate are important for applications ranging from medicine to gas separation and catalysis. Due to the porous nature of such Bi-MOFs, it would be valuable to understand their gas sorption and separation properties. Here, we present the gas sorption properties of three microporous Bi-MOFs, namely, CAU-17, CAU-33, and SU-101, along with a new trimesate-based structure, UU-200. We perform a detailed analysis of the sorption properties and kinetics of these Bi-MOFs. UU-200 shows good uptake capacities for CO 2 (45.81 cm 3 g −1 STP) and SF 6 (24.69 cm 3 g −1 STP) with CO 2 /N 2 and SF 6 /N 2 selectivities over 35 and 44, respectively at 293 K, 100 kPa. The structure of UU-200 is investigated using continuous rotation electron diffraction and is found to be a 3D porous framework containing pores with a diameter of 3.4–3.5 Å. Bi-MOFs as a group of relatively under-investigated types of MOFs have interesting sorption properties that render them promising for greenhouse gas adsorbents with good gas uptake capacities and high selectivities. • Synthesis of a new permanently porous trimesate-based bismuth metal-organic framework (MOF). • High uptake capacity and selectivity for CO 2 and SF 6 of UU-200 was comparable to other Bi-MOFs. • Rate-limiting mechanisms for CO 2 adsorption were found to likely be governed by film diffusion and micropore diffusion.
Highlights
The emission of greenhouse gases (GHGs), and in particular carbon dioxide (CO2), has become an ever-increasing concern in today’s society as global warming and climate change-related issues become more ur gent [1,2,3]
The trans mission electron microscope (TEM) was operated at 200 kV and the sample was mounted on a cryo-transfer to mography sample holder (Gatan 914) and cooled to 98 K using liquid N2 during the data collection
The structure of UU-200 was determined from Continuous rotation electron diffraction (cRED) data of 88% completeness with a resolution up to 1.2 Å and Rint = 0.35, using unit cell parameters obtained from the Pawley fit
Summary
The emission of greenhouse gases (GHGs), and in particular carbon dioxide (CO2), has become an ever-increasing concern in today’s society as global warming and climate change-related issues become more ur gent [1,2,3]. Carbon capture and storage (CCS) technol ogies have garnered significant attention in the last couple of decades as a potential low-cost and facile alternative for CO2 sequestration through the use of solid microporous sorbents such as zeolites [6,7], porous carbons [8,9], and metal-organic frameworks (MOFs) [10,11]. In particular MOFs, a diverse and relatively new class of functional porous materials, have attracted attention as promising sorbents for greenhouse gas capture and sepa ration [14]. The porosities and greenhouse gas capture properties of the BiMOFs were investigated using a volumetric equilibrium-based sorption method and the CO2 adsorption kinetics were studied using a gravimetric-based technique. The rate-limiting mechanisms governing the CO2 adsorption process were investigated using the obtained gravimetric adsorption profiles and estimated CO2 diffusivities were calculated
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