Diamine-functionalized metal-organic frameworks (MOFs) are known as desirable adsorbents that can capture CO2 even at low pressures, but the humidity instability of bare MOF powders as well as their shaping have not yet adequately addressed for practical applications. Herein, we report an effective synthetic strategy for fabricating millimeter-sized MOF/poly(vinylidene fluoride) (PVDF) composite beads with different amounts of PVDF binders (30, 40, and 50 wt %) via a phase inversion method, followed by the postfunctionalization of 1-ethylpropane-1,3-diamine (epn). Compared with the pristine MOF powder, the diamine-grafted bead, epn-MOF/PVDF40, upon mixing with 40% binder polymers, exhibited a superior long-term performance without structural collapse for up to 1 month. The existence of the hydrophobic PVDF polymer in the composite material is responsible for such durability. This work provides a promising preparative route toward developing stable and shaped MOFs for the removal of indoor CO2.
Bibliographical noteFunding Information:
This work was supported by Samsung Research, Samsung Electronics Co., Ltd., the Basic Science Research Program (NRF-2018R1A2A1A05079297), and the Priority Research Centers Program (NRF-2019R1A6A1A11044070). We thank the Institute for Basic Science (IBS) Center for Molecular Spectroscopy and Dynamics (IBS-R023-D1) for providing NMR spectrometry and professional technical support.
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- MOF shaping
- composite materials
- diamine functionalization
- indoor air capture
- metal-organic framework
ASJC Scopus subject areas
- Materials Science(all)