▎ 摘　　要

This study developed an innovative magnetic adsorbent synthesized by combining graphene oxide (GO), obtained by the modified Hummers method, and iron oxide nanoparticles with new characteristics, produced by a modified sol-gel method. Using iron sulphate as a precursor maked it possible to obtain nanoparticles with different characteristics from others synthesized by modified sol-gel method. When combined by an easy and fast ultrasonic method, resulted in the new adsorbent GO-alpha-gamma-Fe2O3-Sh, that was applied in removing diuron herbicide from aqueous solutions. The adsorbent was characterized and after this was used in adsorption batch tests. The experimental conditions was optimized verifying the effect of pH and adsorbent concentration. For these optimized parameters, the results obtained were natural pH of the solution (6.2) and adsorbent concentration of 2 g L-1. Then the isothermal models were validated using equilibrium adsorption data and the GO-alpha-gamma-Fe2O3-Sh was applied to studying adsorption kinetics. In addition, the thermodynamic parameters were evaluated to describe the behaviour of the adsorptive process and an adsorption mechanism was proposed. The results demonstrated a good efficiency and a rapid separation using an external magnetic field, with maximum adsorption capacity of 30.290 mg g(-1) in 8 h of equilibrium at 45 degrees C and was favourable and spontaneous with adsorptive capacity increasing with increasing temperature.