The increasing concentration of carbon dioxide (CO₂) in the atmosphere, largely driven by fossil fuel combustion, necessitates the development of advanced nanomaterials for carbon capture. Metal–organic frameworks (MOFs) have emerged as alternative carbon capture materials due to their porosity and high surface area in contrast to poorly performing conventional methods. However, MOF-74’s performance is limited by moisture sensitivity and inadequate uptake when engaging with low CO₂ partial pressures. This study focuses on the synthesis and post-synthetic modification of a bimetallic Zn_0.75Mg_0.25-MOF-74 to overcome these limitations. The MOF was synthesized using a solvothermal method with terephthalic acid as the organic linker. The effects of varying temperature (100℃ - 150℃) and reaction time (12 h – 48 h) were optimized using a central composite surface response approach. Post-synthetic functionalization with ethylenediamine (ED) was carried out to enhance adsorption affinity and moisture resistance. The physicochemical characteristics of the material were evaluated using XRD, SEM, FTIR, BET, and TGA techniques. It is expected that CO₂ uptake is increased after ED functionalization as the introduced amine groups form stronger interactions with CO₂. The N-H bending and stretching bands indicative of amine incorporation are expected through FTIR analysis, with preserved COO^– stretching vibrations, and C=O, C-O, Mg-O and Zn-O vibrations confirming retention of the MOF framework. The XRD patterns should maintain the characteristic peaks of MOF-74, indicating preserved crystallinity. The SEM micrographs are expected to show an uncompromised morphology, with a marginal decrease in BET surface area due to amine pore occupation. Finally, the TGA is expected to reflect enhanced thermal stability. These findings will present ED-functionalized Zn/Mg-MOF-74 as a potential candidate for scalable, sustainable and efficient CO₂ capture under real-world flue gas conditions.