▎ 摘　　要

Polyethyleneimine(PEI) functionalized graphene oxide was synthesized and completely described by SEM, FTIR, TGA, EDX, XRD, BET and XPS analysis to identify the structure. Then, the as-prepared GO and PEI-GO was dispersed in a 40 wt% aqueous MDEA solution to obtain an amine-based nanofluid. The prepared nanofluid was examined by zeta potential analysis to examine the stability of the solution in the presence of nanoparticles. Absorption experiments were carried out at 303.15, 313.15, 323.15 and 333.15 K and a pressure range of 100-2300 kPa. When 0.1 and 0.2 wt% GO was added to the amine solution, the CO2 absorption capacity was improved up to 9.1% and 10.4%, respectively. The CO2 absorption capacity of the solution in the presence of PEI-GO showed an enhancement rate of 15%. Comparison of the experimental data verified that the addition of PEI-GO greatly affected the CO2 absorption capacity enhancement relative to the addition of GO. Experimental data showed that raising the temperature negatively affect the CO2 absorption rate while higher absorption capacities were observed with increasing the CO2 partial pressure. The increase in partial pressure was the predominant effect compared with temperature.