Improvement of CO₂ capture by graphite oxide in presence of polyethylenimine

In this study, we developed a new CO₂ adsorbents based on graphite oxide (GO) modified with amine groups from polyethylenimine. GO was prepared by a modified Hummers' method. An investigation of CO₂ adsorption by the polyethylenimine-impregnated GO showed that the CO₂ adsorption capacity increased with increasing polyethylenimine content. Polyethyleneimine increases the amount of adsorption of CO₂ resulting from a chemical bond. The polyethylenimine-impregnated GO exhibited higher CO₂ adsorption capacity than pristine GO. From the results, the maximum CO₂ adsorption capacity and CO₂/N₂ selectivity were 32.89 mg g⁻¹ and 37.13, respectively, at a polyethylenimine content of 60 wt%.