▎ 摘　　要

Nowadays, environmental pollution has increasingly been causing serious issues to human health, especially regards to water pollution. Heavy metals and organic dyes are majorenvironmental pollutants. In this study, manganese ferrite/graphene oxide (MnFe2O4/GO) nanocomposites were fabricated by in situ method and used as an adsorbent for the removal of nickel ions (Ni2+), methylene blue (MB) from water. The MnFe2O4/GO nanocomposite with a mass ratio of MnFe2O4 to GO of 1:1 (FGO2) had high adsorption capacity and was easily separated by external magnetic field. The adsorption data of FGO2 fitted well with a pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacities of FGO2 for Ni2+ and MB were determined to be 152.67 and 89.29 mg/g, respectively. MnFe2O4/GO nanocomposite was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, Brunauer-Emmett-Teller (BET) specific surface area, and vibrating sample magnetometer (VSM). FGO2 had the BET specific surface area of 78.46 m(2)/g and VSM of 28.74 emu/g. Based on these results, the FGO2 could be considered as a highly efficient adsorbent for the removal of Ni2+, MB from water.