In this study, we explore the mechanical treatment of two metal-organic frameworks (MOFs), HKUST-1 and MOF-76, applying various milling methods to assess their impact on stability, porosity, and CO2 adsorption capacity. The effects of different mechanical grinding techniques, such as high-energy ball milling and hand grinding, on these MOFs were compared. The impact of milling time, milling speed and ball size during high-energy ball milling was assessed via the Design of Experiments methodology, namely using a 33 Taguchi orthogonal array. The results highlight a marked improvement in CO2 adsorption capacity for HKUST-1 through hand milling, increasing from an initial 25.70 wt.% (5.84 mmol g-1) to 41.37 wt.% (9.40 mmol g-1), marking a significant 38% increase. In contrast, high-energy ball milling seems to worsen this property, diminishing the CO2 adsorption abilities of the materials. Notably, MOF-76 shows resistance to hand grinding, closely resembling the original sample's performance. Hand grinding also proved to be well reproducible. These findings clarify the complex effects of mechanical milling on MOF materials, emphasising the necessity of choosing the proper processing techniques to enhance their stability, texture, and performance in CO2 capture and storage applications.

Department of Chemistry Faculty of Science University of Ostrava 30 Dubna 22 702 00 Ostrava Czech Republic

Department of Inorganic Chemistry Faculty of Science P J Šafárik University Moyzesova 11 041 01 Košice Slovak Republic

Department of Physics School of Applied Science Suresh Gyan Vihar University Jaipur 1 302017 India

Institute of Experimental Physics Slovak Academy of Sciences Watsonova 47 040 01 Košice Slovak Republic

Institute of Geotechnics Slovak Academy of Sciences Watsonova 45 040 01 Košice Slovak Republic

Institute of Materials Research Slovak Academy of Sciences Watsonova 47 040 01 Košice Slovak Republic

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