Systematic Study on MIL-100(Fe) Synthesis Conditions to Enhance Its Properties as a Green Material for CO₂ Capture

This study investigates the optimization of MIL-100-(Fe) metal-organic framework (MOF) synthesis for enhanced CO₂ adsorption, focusing on the effects of the reaction time, initial pressure, and precursor concentration on the BET surface area, crystallinity, and pore size distribution. Through hydrothermal synthesis, three MIL-100-(Fe) series were developed to examine the relationship between structural parameters and CO₂ uptake, characterized by powder X-ray diffraction (XRD), adsorption analysis, and Mössbauer spectroscopy. The results show that higher precursor concentrations lead to increased crystallinity and surface area, with BET values reaching a peak at 1775 m²/g. The sample with the optimal precursor concentration demonstrated the highest CO₂ uptake at 1.91 mmol/g, likely due to the presence of fine hematite nanoparticles within the structure. Additionally, the samples exhibited excellent stability and reusability in the cyclic CO₂ sorption experiments. These findings provide valuable insights into the synthesis-structure-property relationships in MIL-100-(Fe), enhancing its potential for CO₂ capture and environmental remediation.