Adsorption with solid sorbents is one of the most promising options for carbon dioxide (CO2 ) capture. In this study, we developed novel adsorbents of graphite oxide (GO) modified by tetraethylenepentamine (TEPA). Samples were prepared with raw TEPA/GO ratios of 3, 5, 10, and 50 wt %, which we referred to as 3, 5, 10, and 50% aminated graphite oxide (AGO), respectively. The CO2 capture capacities of the different AGO samples were investigated at 25, 40, 70, and 90 degrees C over a wide range of pressures (0.1-5 MPa) using a high-pressure volumetric analyzer. With increasing pressure, the excess adsorbed amounts of both the pristine and modified GO samples increased significantly, with a peak near 3 MPa followed by a sequential decrease. In addition, both temperature and the amount of TEPA loaded on the surface markedly affected the adsorption capacity. The 3 and 5% AGO samples showed adsorptivity better than that of the pristine GO sample, while the 10 and 50% AGO samples exhibited worse performance. Furthermore, for the 3 and 5% AGO samples, the adsorption capacity was markedly improved at 70 degrees C in comparison with the pristine GO sample, suggesting that these are appropriate temperatures and TEPA/GO ratios for CO2 capture.