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Sun et al. Microstructures 2023;3:2023032 https://dx.doi.org/10.20517/microstructures.2023.32 Page 15 of 21

Figure 13. (A) Single-component CO isotherms on ZnDatzBdc up to 100 kPa and varied temperatures; (B) adsorption isotherms of
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CO , N , and CH up to 100 kPa at 273 and 298 K; (C) CO working capacities for the step-shaped isotherm of ZnDatzBdc and the
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2
2
4
simulated Langmuir isotherm from the CO adsorption data in the open phase, for a cycle of adsorption at 100 kPa and desorption at
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20 kPa (273 K); (D) comparison of CO uptakes and working capacities of ZnDatzBdc and other flexible MOFs with S-shaped CO
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isotherms. Reproduced with permission from Peng et al. [125] . Copyright 2022 American Chemical Society.
2-
GeFSIX = GeF ), was prepared for the first time by sphere mill auxiliary conversion methodology by
6
2-
Zhang et al. . The strong binding affinity of GeF and the comparatively long Ge-F bond distance
[102]
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(1.83 Å) lead to increased electronegativity and pore size contraction, resulting in high capacity and
enhanced selectivity for trapping trace amounts of CO (1.07 mmol g at 400 ppm).
-1
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A winning path to high levels of connectivity MOFs was proposed by Cairns et al. in 2007 by using metal-
organic polyhedra (MOPs) as supramolecular building blocks (SBBs) . NJU-Bai52 and NJU-Bai53,
[127]
prepared by a pure-supramolecular-linker (PSL) approach, are two kinds of high-connected isomeric MOFs
[128]
with a rare (3,3,6,6)-c topology . Among them, TPBTM acts as a 12-connected supramolecular linker
connected by the M O cluster, forming two height-connected linkers. The equilibrium charge on these M O
3
3
clusters was delicately tuned from Cl ions to monodentate hydroxide anions, resulting in a significant ~50-
-
fold increase in the CO uptake for NJU-Bai53 (2.74 wt%) compared to NJU-Bai52 (0.74 wt%) at 298 K and
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0.4 mbar. At 298 K and 0.15 bar, the CO uptake of NJU-Bai53 (7.67 wt%) was greatly increased compared
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to NJU-Bai52 (0.057 wt%), which is the highest among the reported amide-functionalized MOFs
(AFMOFs). In addition, NJU-Bai53 exhibited higher selectivity and chemical stability [Figure 15].
CONCLUSIONS
In conclusion, a great deal of CO capture research has been performed on MOFs in the past few decades.
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This is due to their special properties, such as large pore volume, high surface area, maintainability,
structural diversity, etc. This review systematically describes several strategies that can be applied to design