CO ₂ Adsorption on Mesoporous Silica Using Response Surface Methodology (RSM)

ABSTRACT The aim of the current study is to investigate the CO 2 adsorption on the mesoporous silica. The adsorbent was characterized by XRD, TEM, SEM, and N2 adsorption desorption. The adsorption isotherms of carbon dioxide (CO 2 ) on the silica were investigated using a static volumetric method at various temperatures. The response surface methodology (RSM) was applied to the influence of different variables and their interaction on the response (CO 2 adsorption capacity) in order to obtain the optimal conditions. According to the analysis of variance, the pressure and the temperature parameters are the variables that influence the CO 2 adsorption capacity. Freundlich, Langmuir, and Langmuir–Freundlich (L‐F) models were used to depict the isothermal data, and the L‐F model exhibited the best correlation with the experimental isotherm. In addition, the temperature‐dependent L‐F model was applied to adjust the CO 2 adsorption data on the adsorbent, and the isosteric heat of CO 2 was calculated. Additionally, compared with other samples, the mesoporous silica demonstrated superior regenerability and thermal stability.