CO2 adsorption performance of amine clay adsorbent

The purpose of this article is to prepare an effective adsorbent for CO2 capture and to provide detailed analyses of the adsorption properties. For this purpose, natural clay was modified with amine using monoethanolamine (MEA) and ethylenediamine (EDA). The effect of amine was characterized by FTIR and XRD methods. In addition, ImageJ software was joined to the SEM to have realistic porosity segmentations. The results indicate that the CO2 adsorption capacity of clay can be enhanced through amine modification. It is observed that amine clay has the best CO2 adsorption capacity. The equilibrium isotherms for CO2 adsorption, measured at different temperatures (25, 50 and 75 degrees C), demonstrate that amine clay have lower capacities of CO2 compared to the untreated clay. Adsorption isotherms were fitted using the Langmuir model. Based on the correlation coefficient, the isotherm model was well suited to the experimental data of CO2 adsorption isotherms. The calculated values of the thermodynamic parameters revealed that the process involving CO2 adsorption on amine clay adsorbent was physical, spontaneous and exothermic.