Synthesis, Characterization and CO₂ Adsorption Performance of a Novel POM-132@MOF-5 Composite for Carbon Capture Applications

Developing efficient materials that can absorb carbon dioxide (CO₂) is crucial in the battle against climate change and in reducing greenhouse gas emissions. In this study, a new type of material called POM-132@MOF-5 was made using a simple one-step method. This material combines a polyoxometalate and a metal-organic framework. The composite mixes the large surface area and porous design of MOF-5 with the special redox and oxygen-rich features of POM-132, with the goal of improving CO₂ adsorption performance. The made materials were analyzed using four techniques: Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray Spectroscopy (EDS). FTIR and XRD tests showed that POM-132 was successfully added to the MOF-5 structure without damaging either part. SEM images showed a well-organized structure with evenly spread particles. EDS analysis confirmed that the composite contains the elements zinc, molybdenum, carbon, and oxygen. CO_₂ adsorption tests were done using a special machine at a temperature of 273 K, and we varied the pressure between 0.5 and 2.5 bar. The POM-132@MOF-5 mix showed that it can hold 25 millimoles of CO_₂ for each gram at a pressure of 2.5bar. This means it can absorb CO₂ well and that its ability to do so depends on the pressure. The better performance comes from the combined effect of POM-132 and MOF-5, which adds more active sites and helps with effective gas absorption. The results demonstrate that POM-132@MOF-5 might be an excellent candidate for carbon trapping and contributing positively to ecological health.