▎ 摘　　要

In this work, the magnetic Fe3O4-graphene oxide (Fe3O4-GO) nanocomposite is synthesized via a facile one-pot hydrothermal method and used for settling down and removing solid suspended particles in wastewater. Physicochemical characterizations not only confirm the successful in-situ deposition of magnetic Fe3O4 nanoparticles on GO nanosheets, but also disclose the strong interaction between them. The Fe3O4-GO nanocomposite demonstrates an excellent capability of accelerating the settling process in the presence of magnetic field. It can reduce the Kaolinite solid particle concentration by an order of magnitude within 30 minutes, which is one time faster than that in the absence of magnetic field. The solid suspension absorbing behavior on the Fe3O4-GO nanocomposite in the presence of magnetic field is found to fit with Langmuir and Freundlich isotherm models and the pseudo-second-order kinetic model. The calculated adsorption capacity reaches 58.46 mg.mg(-1), and the initial adsorption rate reaches as high as 0.0275 mg.mg(-1) min(-1). The Fe3O4-GO nanocomposite is proved to be an effective, efficient and promising magnetic coagulant for the rapid treatment of solid suspended particles in wastewater and natural water.