Effect of synthesis conditions on CO2 capture of ethylenediamine-modified graphene aerogels

Ethylenediamine-modified graphene oxide-based three-dimensional aerogels were fabricated by one-step hydrothermal technique. The influence of oxidation conditions and starting graphite material was studied by elemental analysis, X-ray photoelectron spectroscopy, Raman spectroscopy and Scanning electron microscopy. The CO₂ adsorption properties of modified aerogels were tested. The results show the distribution of oxygen groups and type of GO altered by oxidation conditions and graphite nature induce a different N doping configuration in the modified aerogel and a higher surface utilization factor for the CO₂ capture. The GO-based aerogel obtained from expanded graphite exhibited the best performance (2-fold the un-modified one), reaching a value of 1.18 mmol g⁻¹ at 1 bar and 298 K, thus indicating the high potential of the present approach towards enhancing the CO₂ capture.