Enhanced water stability and high CO2 storage capacity with MOFs

What is it about?

2,2′-bipyridine-5,5′-dicarboxylate is particularly useful among the Zr-Metal-Organic Framework family due to the Lewis basic sites of the linker; however, the hydrolytic stability of UiO-67(bipy) does not seem to be as high as those of UiO-66 and UiO-67. To improve the hydrolytic stability without sacrificing the adsorption enthalpy of CO2 for selective CO2 capture, in this study, we added hydrophobic methyl groups to the backbone of the bipyridine linker.

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Why is it important?

We revealed that [MOF-553, Zr6O4(OH)4(Me2Bipy)6] which we have prepared via adding hydrophobic methyl groups to the backbone of the bipyridine linker is more robust and has a higher CO2 adsorption capacity than UiO-67(bipy), indicating that the methylation of the linker improves the water stability of the framework, which is advantageous for point-source CO2 capture.