▎ 摘　　要

Graphene oxide/Mg-Fe layered double hydroxide (GL) composites with varying layered double hydroxide (LDH) contents were synthesized by a facile direct co-precipitation method, and then used as adsorbent to remove the heavy metal ions in aqueous solution. The structures and morphologies of GL composites were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Raman spectra, thermal gravimetric analysis and X-ray photoelectron spectroscopy. The removal behaviors of Pb(II), Cd(II), Cu(II) and Zn(II) onto GL composites were investigated. The adsorption results could be well described by pseudo-second-order kinetic model and Langmuir model. The intraparticle diffusion model indicated that the adsorption of heavy metal ions on GL composites was a multi-step process. The thermodynamic parameters suggested that the adsorption process was spontaneous and endothermic in nature. Furthermore, the maximum adsorption capacities for Pb(II), Cd(II), Cu(II) and Zn(II) obtained from Langmuir model were about 704.23, 193.80, 229.89 and 99.21 mg g(-1), respectively. The as-prepared materials could effectively remove the heavy metal ions in actual wastewater.