Nowadays, separating and absorbing carbon dioxide from the atmosphere is a challenging and difficult method. Absorption is one of the common and widely used methods for separating carbon dioxide and it is divided into two physical and chemical methods. This method has attracted the attention of many researchers in the last few decades, and a lot of research has been done in the field of carbon dioxide separation and absorption by physical and chemical absorption. In order to increase the efficiency of carbon dioxide absorption, various adsorbents have been introduced, the most important of which are nanoparticles, microparticles, amines, alcohols, etc. In this research, carbon dioxide absorption was carried out by chemical absorption method using Fe3O4 and NiO nanoparticles and MDEA/MeOH/MEA base solutions in a column filled with a fixed bed. The main goal of this research is to investigate the effect of nanoparticles, amine and amount on carbon dioxide absorption. The variables examined in this research are the flow rate of gas and liquid entering the column, the effect of MDEA/MeOH/MEA basic solutions and different percentages of nanoparticles. The amount of carbon dioxide absorbed through the difference between gas input and output was measured by a GC device and the amount of absorption was obtained by calculating using mass transfer equations. The results showed that with the increase in liquid flow rate, the separation percentage and the overall mass transfer coefficient increased, and also with the increase in the gas flow rate, the separation percentage increased significantly and the overall mass transfer coefficient decreased
noticeably. For different percentages of Fe3O4 and NiO nanoparticles, the separation percentage and overall mass transfer coefficient both increased up to an optimal concentration and then decreased. It was found that pure water exhibits a negligible mass transfer coefficient (0.000019 1/s) compared to other basic solutions (MDEA and