Abstract
The search for effective carbon-capture materials has permitted the disclosure and institution of nanoporous fluorinated metal–organic frameworks (MOFs) with a contracted pore system as benchmark CO2-selective adsorbents. Namely, the SIFSIX-3-M (M = Zn, Cu, and Ni) MOF adsorbents, encompassing a periodic arrangement of fluorine moieties in a confined one-dimensional channels, exhibit a remarkable CO2 adsorption-based selectivity over CH4 and H2 in various industrially related gas mixtures. Here, we report the successful transplantation/integration of this distinctive CO2 selectivity, distinguishing this class of nanoporous MOF adsorbents to pure MOF membranes for carbon capture. Markedly, the liquid-phase epitaxy (LPE) growth approach permitted, for the first time, the building of continuous, homogeneous, and defect-free MOF membranes based on the SIFSIX-3-M platform, MSiF6(Pyz)2 with M = Ni or Cu, on a porous alumina substrate. Single and mixed-gas permeation tests revealed that the resulting nanoporous MOF membrane is a CO2-selective membrane, exhibiting the foreseen favorable CO2-selectivity toward carbon dioxide over H2, and CH4, governed by the CO2-selective adsorption in the functional and contracted channels of the SIFSIX-3-M.
Highlights
The fossil-fuel-based economy is recognized as the main cause for the greenhouse gas emission worldwide with more than 2 billion tons of exhaust carbon dioxide each year.[1]
In light of the unique properties of this class of materials, we found it compelling to explore their deployment as a continuous metal−organic frameworks (MOFs) membrane for CO2 capture, paving the way to shift the use of this platform from solid adsorbent to a membrane-based separation
To the best of our knowledge, none of these SIFSIX-3-M MOFs have ever been synthesized nor grown as a thin film attached to a surface using the liquid-phase epitaxy (LPE) approach and subsequently explored as a membrane for gas separation
Summary
The fossil-fuel-based economy is recognized as the main cause for the greenhouse gas emission worldwide with more than 2 billion tons of exhaust carbon dioxide each year.[1]. The tunability of nanoporous MOFs offers great potential for their deployment as gas separating agents, especially the membrane-based approach is emerging and has gained notable consideration in the last years.[14] The deployment of MOFs as membranes for gas separation and purification remains challenging and mostly relies on the ability to construct continuous/defect-free MOF thin-films.[14,15] Despite the intensive research concerned with the fabrication of MOF. Article membranes, it is still in its early stages and a more constructive and cooperative efforts are needed to overcome the persisting challenges, like growing defect-free thin films that exhibit very good bonding/adhesion to the support. To the best of our knowledge, none of these SIFSIX-3-M MOFs have ever been synthesized nor grown as a thin film attached to a surface using the LPE approach and subsequently explored as a membrane for gas separation
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