Experimental Investigation and Modeling of CO۲ Adsorption Using Modified Activated Carbon

In this research, Activated Carbon (AC) was modified using a sodium hydroxide solution for CO۲ adsorption. Adsorption experiments were carried out in a batch reactor at a temperature range of ۲۰-۸۰°C and a pressure range of ۲-۱۰ bars to investigate kinetic, isotherm, and thermodynamic of the CO۲ adsorption process. Activated carbon was modified with NaOH solution concentration in the range of ۱۰-۴۰%. Response Surface Methodology (RSM) was used to assess the combined effect of adsorption CO۲ pressure and temperature on CO۲ adsorption capacity. Also, RSM was used to obtain the optimum operational conditions. The results showed that modified activated carbon with ۳۰% NaOH concentration (۳۰SH-AC) provided the best performance for CO۲ adsorption. The optimum CO۲ adsorption capacity was obtained ۱۰۴.۳۲ mg/g for ۳۰SH-AC at a temperature of ۲۰°C and pressure ۶ bars. The sips model was found to be the best for fitting the CO۲adsorption isotherm. Also, the kinetic study indicated that the pseudo-second-order model is well-fitted with the experimental data. The thermodynamics parameter shows that the CO۲ adsorption process is exothermic.

کلیدواژه ها:

CO۲ Adsorption ، NaOH ، Modified Activated Carbon ، Isotherm ، kinetic ، thermodynamic