The synergistic influence of porous structure and unsaturated metal sites in MOF-199 on CH3I adsorption

Abstract

In this study, MOF-199 is investigated for CH₃I adsorption by pore structure and metal centers. The introduction of benzoic acid to construct defects alters the micropore volume, indicating that the microporous structure enhances the iodomethane adsorption process. Studies on metal centers have demonstrated that unsaturated metal sites play a dominant role in adsorption, with Cu⁺ being crucial for strong chemisorption. Under conditions of 134 ppm and 303 K, MOF-199 achieves a CH₃I adsorption capacity of 156.7 mg/g. Thermodynamic and kinetic analyses respectively indicate that the process is predominantly governed by chemisorption and controlled by intraparticle diffusion.