, obtained under conditions of 303 K, and an initial pressure of 18.5 bar when the amine to ethanol concentration ratio was 60% w/w. Furthermore, the effect of the MWCNTs diameter on adsorption capacity was investigated as well. Results proved that by increasing the MWCNTs diameter in the raw and amine-functionalized samples, the adsorption capacity increased. Additionally, the adsorption isotherms were evaluated by Langmuir and Freundlich models, and the isosteric heat of adsorption, the adsorption mechanism and the adsorption capacity were measured. Ultimately, the regeneration cycles of optimal adsorbent was performed in five stages, indicating that the adsorbent was stable enough for the regeneration process.
Vayghan et al. (Thu,) studied this question.