▎ 摘　　要

In this study, a novel graphene-based composite, dibromocarbene modified graphene (Gr-CBr2), was successfully synthesized by a simple cycloaddition procedure. The obtained composite was fully characterized by Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The adsorption properties of Gr-CBr2 for Pb(II) ions from aqueous solutions were evaluated. The experimental data fitted well to the Langmuir isotherm. And a maximum adsorption capacity of 49.46 mg.g(-1) was obtained for Gr-CBr2 at 298 K, which was around 19 times higher than that (mg.g(-1)) of as-received graphene. The results indicated that Gr-CBr2 may be used as an efficient adsorbent for the removal of Pb(II) from aqueous solutions.