Physicochemical parameters interpretation for adsorption equilibrium of ethanol on metal organic framework: Application of the multilayer model with saturation

This work is a theoretical investigation of the ethanol adsorption on metal organic framework. The main objective of this work is to explain the adsorption isotherms at different temperatures in order to relate this process by physicochemical parameters. A proposed statistical physics model called ^‘multilayer model with saturation^’ was selected and applied to interpret the adsorption data. Five physicochemical parameters in relation with the adsorption process were included, such as the number of ethanol molecules per site (n), the receptor site density (N_M), the number of adsorbed layers (N₂) and the adsorption energies (− ΔE₁) and (− ΔE₂). The equilibrium data were interpreted through these parameters. Simulation results showed that the adsorption of ethanol molecules is multi-molecular process. The study of the total saturation adsorbed quantity indicates that the adsorption process is exothermic. The magnitudes of the calculated adsorption energy indicate that the ethanol molecules are physisorbed on metal organic framework. Van der Waals interactions are implicated in the adsorption process.