Zirconium-based metal organic frameworks (Zr-MOFs) are highly chemically and thermally stable and have been of particular interest as reactive sorbents for chemical warfare agent (CWA) removal due to their fast and selective reactivity toward CWAs reported in buffer solutions. However, we find that decontamination of neat CWAs directly on Zr-MOFs, UiO-66, UiO-66-NH<sub>2</sub> and NU-1000, are rather slow and the reactivity trend and products generated are very different from those in solution. Furthermore, we show that their decontamination rates are affected by the amount of moisture present in the MOFs. While the effects are minor for UiO-66-NH<sub>2</sub> and NU-1000, the hydrolytic activity of UiO-66 toward CWAs dramatically improves as the amount of water present increases. Specifically, the half-life of UiO-66 decreases from 19 d with 0 wt % water loading to less than 1 h with 400 wt % water loading. The results reported here suggest that decontamination of CWAs by Zr-MOFs in solid phase behaves very differently than solution decontamination. Additionally, we present for the first time a digestion method for analyzing and quantifying solid-phase decontamination, which is a daunting challenge itself due to lack of a convenient analytical method.

Solid-phase detoxification of chemical warfare agents using zirconium-based metal organic frameworks and the moisture effects–analyze via digestion

2019 Fall National Meeting

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