▎ 摘　　要

Graphene oxide (GO) was prepared by a modified Hummers' method. GO was modified using a simple CO2 pressure swing technique to obtain exfoliated GO. The microcrystalline structures and morphologies were characterized using the X-ray diffraction and scanning electron microscope/transmission electron microscope measurements. The textural properties were investigated by N-2 (77 K) adsorption/desorption isotherms. CO2 (298 K, 30 bar) and H-2 (298 K, 100 bar) adsorption experiments were conducted to investigate their adsorption behaviors. The results indicated that the best sample had a specific surface area of 547 m(2)/g and total pore volume of 2.468 cm(3)/g. According to the results, CO2 pressure swing method can be used to increase the efficiency of exfoliation and expansion of the graphitic interlayers in GO. (C) 2013 Elsevier Ltd. All rights reserved.