▎ 摘　　要

A simple and one-step method of producing graphenes was investigated in this work. We have modified the Hummer electrolysis method and combined it with ionic liquid for productions. The results showed that the graphenes could absorb Cu2+ at 202.2 mg/g. Additionally, the mechanism of how graphenes absorb metal and the effects of acidity are described. We have proved that the synthesized graphenes successfully based on transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray powder diffraction (XRD), Raman spectroscopy (Raman), and Fourier transform infrared (FTIR) analysis. This investigation also showed that the graphenes' highest adsorption of Cu(II) at pH 8 mainly resulted from the ionic-like charge and no-defect surface. We found that the highest conductivity of 10(-2) S/m was achieved as the binary graphene/epoxy composite (0.3%). (C) 2012 The Japan Society of Applied Physics