چكيده به لاتين
Today, due to the excessive emission of greenhouse gases from power plants and industries, especially carbon dioxide, which have caused many problems in the life cycle and global warming, their adsorption and separation is necessary. Therefore, different methods such as absorption, adsorption, membrane and etc. have been proposed to separate carbon dioxide. Due to the stated characteristics for deep eutectic solvents including boiling point and high heat capacity, environmental compatibility and following the principles of green chemistry, easy and cheap synthesis, these solvents have significant potential. Extensive progress and various new applications are expected for them. Given these issues and the importance of environmental protection, the processes of green chemistry and its important principles, namely the replacement of green solvents should be considered as a necessary solution. Therefore, the use of deep eutectic solvent and its stabilization to improve the adsorption of porous materials such as silica gel is investigated and researched in this study, in order to determine the advantages for eutectic solvents and selection permissibility and high specific surface area of porous materials used simultaneously. The aim of this study was to modify the porous base of silica gel with eutectic solvent (choline chloride + monoethanolamine (ChCl + MEA)) to improve the carbon caoture. The structural properties of the adsorbent were investigated by various analyzes such as BET, FTIR and SEM. Optimal operating conditions of temperature and pressure were 25 ° C and 7 bar, respectively. The optimal adsorption value for the modified adsorbent was 1.495 mmol/g. In addition, experiments have been performed to investigate isothermal, kinetic, and thermodynamic models of adsorption. For the modified silica gel and silica gel, the isotherm model is consistent with the dual Langmuir isotherm model, which indicates the heterogeneity of the surface. The study of kinetic models showed that for the adsorbent, the Fractional Order model had the best fit with the adsorption data. Finally, the feasibility of the adsorption process is investigated using thermodynamic modeling. The enthalpy, entropy and ΔG at 298.15 Kelvin are -2.77471, -0.00541 and -1.16224, respectively, indicating it is exothermic and spontaneous process.
