Metal-Organic Frameworks are crystalline structures formed by metallic clusters and organic linkers. Magnesium-based MOFs are very attractive because of its thermal stability, microporous pore size, high surface area, and high ionic character of the metal site. Those characteristics allow that magnesium-MOFs, have shown high CO2 adsorption capacity compare to other structures. Due to its properties, many MOFs investigations have taken place for the improvement of its internal structure by synthesizing MOFs with different linkers that allow the incorporation of new functional groups in its structure and with it, improve the selectivity of CO2 adsorption from gas mixtures. Despite these engineering approach, there is still consider that MOFs adsorption capacity is still low compare to conventional technologies, Therefore, the investigations suggest that the functionalization of different linkers allow reorganizing the crystalline structure of the MOFs through the formation of new Lewis base sites that increase the interactions between the CO2 and the basic active sites of the functional groups, leading to the formation of organic carbamates.<br/><br/>This research aimed to study the effect of the addition of different linkers derived from terephthalic acid during Magnesium-MOF synthesis, on the textural and structural properties, thermal stability, and CO2 adsorption capacity. At first, two Magnesium-based MOFs were synthesized by using different ligands such as terephthalic acid and 2,5-dihydroxyterephthalic acid, respectively. Both MOFs reported from literature and consider as the control group. Then, new materials were synthesized by the functionalization of each ligand used from the first part of the investigation and each new linker derived from terephthalic acid: 2-aminoterephthalic acid and 2-nitroterephthalic acid. The textural properties, identification of functional groups, crystallization, and thermal stability, were evaluated with Argon adsorption-desorption isotherms, IR spectrometry, X-ray diffraction, Scanning electron microscopy, and Thermogravimetric Analysis, respectively. The results were compared with no functionalized samples. Finally, the adsorption capacity was studied with Thermogravimetric Analysis, and the quantity of CO2 was calculated for each sample. The functionalization of new linkers allows improving the CO2 adsorption capacity of the MOFs converting them into promising materials for gas storage applications.

Magnesium-based metal-organic frameworks modified with organic ligands to carbon dioxide (CO2) storage applications

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