[논문]Adsorptive removal of nerve-agent simulant with zirconium-based metal-organic frameworks modified by hydrophobic monocarboxylic acids

Cho, Kyung Ho; Chitale, Sachin K.; Kim, Seung-Joo; Cha, Ga-Young; Hong, Do-Young; Ryu, Sam Gon; Chang, Jong-San; Hwang, Young Kyu

doi:10.1016/j.micromeso.2019.04.035

Adsorptive removal of nerve-agent simulant with zirconium-based metal-organic frameworks modified by hydrophobic monocarboxylic acids

Microporous and mesoporous materials : the official journal of the International Zeolite Association, v.285, 2019년, pp.61 - 69

Cho, Kyung Ho (Research Group for Nanocatalysts (RGN), Korea Research Institute of Chemical Technology (KRICT)) , Chitale, Sachin K. (Department of Advanced Materials and Chemical Engineering, University of Science and Technology (UST)) , Kim, Seung-Joo (Department of Energy Systems Research and Department of Chemistry, Ajou University) , Cha, Ga-Young (Department of Advanced Materials and Chemical Engineering, University of Science and Technology (UST)) , Hong, Do-Young (Research Group for Nanocatalysts (RGN), Korea Research Institute of Chemical Technology (KRICT)) , Ryu, Sam Gon (Agency for Defense Development) , Chang, Jong-San (Research Group for Nanocatalysts (RGN), Korea Research Institute of Chemical Technology (KRICT)) , Hwang, Young Kyu (Research Group for Nanocatalysts (RGN), Korea Research Institute of Chemical Technology (KRICT))

Abstract ▼ AI-Helper

Abstract An isoreticular series of zirconium-based benzenetricarboxlyates (MOF-808) were successfully synthesized using different lengths of linear mono-carboxylic acids (i.e., formate, propionate, and valerate) as a charge-balancing ligand, and then were applied for removal of nerve-agent simulants. Removal of dimethyl methylphosphonate (DMMP) as a nerve-agent simulant of the MOF-808 analogues was conducted in dry and humid air. Tests demonstrated that the adsorption capacity of DMMP was considerably enhanced with increase in the carbon chain length of the incorporated mono-carboxylic acids of the MOF-808 (formate < propionate < valerate). The physicochemical characteristics and sorption properties of the MOF-808 analogues were thoroughly investigated using in situ FT-IR analyses and various characterization techniques, including such as XRD, N2 sorption, TGA, SEM, Elemental Analysis (EA), and hydrophobic index (HI) measurements. It is apparent that the predominant factor affecting the MOF-808 analogues for the removal of DMMP was the concentration of surface oxygenated species (μ3-OH, OH, or OH2). These could act as active sites to adsorb DMMP via hydrogen bonding with the PO of a DMMP molecule and then decompose it by hydrolysis. These results demonstrate that simple modulation of the surface environments of Zr-based MOFs can be adapted to tune their intrinsic efficiency for removal of toxic chemicals. Highlights A MOF-808 series was synthesized with different lengths of mono-carboxylic acids. Adsorption of DMMP was studied under humid conditions by dynamic sorption. In situ IR analyses were conducted to confirm the active sorption site of DMMP. Mechanisms for sorption of DMMP on the MOF-808 analogues were proposed. Graphical abstract [DISPLAY OMISSION]

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Adsorptive removal of nerve-agent simulant with zirconium-based metal-organic frameworks modified by hydrophobic monocarboxylic acids

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Adsorptive removal of nerve-agent simulant with zirconium-based metal-organic frameworks modified by hydrophobic monocarboxylic acids

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