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

This study investigates the optimization of MIL-100-(Fe) metal-organic framework (MOF) synthesis for enhanced CO 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 CO 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 m/g. The sample with the optimal precursor concentration demonstrated the highest CO 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 CO sorption experiments. These findings provide valuable insights into the synthesis-structure-property relationships in MIL-100-(Fe), enhancing its potential for CO capture and environmental remediation.