this study, carbon dioxide absorption was carried out by chemical method using alumina nanoparticles and amine base solution (diethanolamine) in a rotating packed bed. The main objective of this study is to investigate the effect of alumina nanoparticles and DEA and amine concentration on carbon dioxide absorption. The variables investigated in the study are the gas flow rate and the solution to the rotating packed bed. The effect of DEA solution on different surfaces of nanoparticles was measured by GC device and the absorption rate was obtained by calculating using mass transfer equations. The results showed that with increasing liquid flow rate, the separation percentage and the overall mass transfer coefficient increased and also with increasing gas flow rate, the separation percentage increased significantly and the overall mass transfer coefficient decreased noticeably. It was found that pure water showed a negligible mass transfer coefficient (0.0000019) compared to other base solutions (MDEA and DEA). The highest separation percentage was obtained for pure water, 44.9%.
The results of this study showed that the use of alumina nanofluid in a rotating packed bed significantly improved the CO₂ adsorption performance. Based on the design of experiments using the RSM method and statistical analysis in Minitab software, the optimal operating conditions were determined to include a nanoparticle concentration of 0.5 wt%, a liquid flow rate of 0.4 L/min, and a gas flow rate of 3 L/min. Under these conditions, the overall mass transfer coefficient (K_Ga) reached 1.958 and the CO₂ removal percentage reached 98.63%. These improvements are mainly due to the increased contact area, nanofluid stability, and enhanced hydrodynamic mixing in RPB, which is consistent with the findings of previous studies such as the works of Ghadianlou et al. (2021-2022) and Sheng et al. (2018), but highlights the innovation of this research by achieving a higher removal percentage.