The composites of UiO-66 with insitu dispersed nanographite or oxidized graphitic carbon nitride nanospheres (~10 wt %) were synthesized and used as CEES decontamination media from a vapor phase. The materials were characterized using XRD, nitrogen adsorption, SEM, potentiometric titration, FTIR, and thermal analysis. The results showed a marked improvement of these composites the detoxification capability against the vapors of CEES compared to pristine UiO-66, either in terms of the amount adsorbed or surface reactivity. The maximum measured weight uptake for the composites reached 632 mg g-1, which was higher than that that on UiO-66. The improved adsorption and catalytic activity were linked to the new interface between the modifiers and MOF units/defects which provided active sites formed from the reaction of zirconium clusters with modifiers' surface groups acting as MOF linkers. The morphology and porosity were also altered, positively affecting the sites' accessibility and their dispersion in the MOF particles. Dehydrohalogenation and oxidation were found as the predominant pathways on the composites. The detoxification mechanisms in the case of CEES vapor-solid interactions differed from those reported for CEES liquid/dissolved liquid-solid interactions and dehydrohalogenation, fragmentation, and oxidation, not hydrolysis, predominated.

Defectous UiO-66 MOF nanocomposites as reactive media of superior protection against toxic vapors

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.