▎ 摘　　要

Magnetic nanocomposites Ag/AgCl@ Fe3O4 @ GO were synthesized by solvothermal process. The structure and morphology of the products were characterized by transmission electron microscopy , scanning transmission electron microscopy, energy dispersive X-ray spectroscopy and nitrogen adsorption and desorption method. The adsorption properties of the materials for 2,4-dichlorophenol (2,4-DCP) in aqueous solution were studied. The results indicated that the nanocomposites were composed of Ag/AgCl@ Fe3O4 spherical magnetic nanoparticles with mesoporous structure loaded on the folded surface of graphene oxide. The average pore size of the product was 13.98 nm, and the specific surface area and pore volume were 46.91 m(2)/g and 0. 1791 cm(3)/g, respectively. The adsorption experiment of 2,4-DCP on Ag/AgCl@ Fe3O4 @ GO composite showed that 14 20 mg/L of 2,4-DCP solution, the adsorption equilibrium was basically reached in 20 min, and the adsorption capacity was 13.74 mg/g. The adsorption fitted well with pseudo second-order kinetic model, and the correlation coefficient was 0.99954. The Langmuir model was more suitable for describing the adsorption with the correlation coefficient range of 0.9841-0.9972, which showed that the adsorption was a monolayer adsorption. Adsorption thermodynamic parameters Delta G were -5.0462 kJ/mol (293 K), -4.4076 kJ/mol (303 K), -3.7522 kJ/mol (313 K), -3.4358 kJ/ mol (323 K), Delta H and Delta S were -17.1653 kJ/mol and -42.2158 J/(mol . K), respectively. The adsorption process was a spontaneous exothermic process with entropy decreasing. In addition, the temperature was lower and the adsorption was better, which showed the characteristics of physical adsorption. This kind of functional composite not only had good adsorption activity, but also could be recycled by the way of external magnetic field.