Molecular Nanoparks for CWAs, TICs, and TIMs

Abstract : Metal-organic frameworks (MOFs) with rigid, permanently porous structures have been shown to adsorb a variety of guests, including known carcinogens; however, little is known about the capacity of MOFs for dynamic gas adsorption properties. Therefore, dynamic adsorption experiments with various gases and CWA/simulants were performed. We first prepared M-MOF-74 (M = Zn, Mg, Co, Ni) series and tested their ability to separate ammonia from both dry and wet air. In dry conditions, all of the MOFs have excellent separation capacity (greater than 1 mol/kg). In humid conditions, the uptake drops in every case, but ammonia uptake remains high. After the clear demonstration of metal effects on gas selectivity, we extended our strategy to create metalated nanoparks; we synthesized MOF-253 for successive metalation reactions. We tested the ammonia separation capacity for Cu, Zn, and Fe impregnated MOF-253 materials. Based on the dynamic loading melataed MOF-253 samples clearly outperform the pristine MOF-253, and ammonia loading values are comparable to those for M-MOF-74 series. More importantly, the metalated MOF-253 series showed significant saturation loading capacity for ammonia in a humid environment.