Abstract: To solve the problem of comprehensive utilization of agricultural resources waste and pesticide pollution. The hydrothermal carbon was prepared by the hydrothermal carbonization method from cornstalks and characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy.The effects of  different pH values,  ionic strength,  initial concentration  and different prepared temperatures on the adsorption of Atrazine by hydrothermal carbon of cornstalks  were  studied by laboratory simulation.The results show that with the increase of temperature,  hydrothermal carbon produced carbon microsphere structure and abundant oxygen-containing functional groups. The adsorption kinetics of hydrothermal carbon on Atrazine conforms to  the quasi-second-order kinetic equation (R²≥0.970,  P≤0.001), and the adsorption thermodynamics conforms to the Langmuir  equation (R²≥0.992,  P≤0.001 ), which is  a nonlinear adsorption and  spontaneous  endothermic reaction. The maximum adsorption capacity of hydrothermal carbon is   8.862 mg/g,  and the maximum removal rate is 69.74% at 298 K. The adsorption capacity of  Atrazine by hydrothermal carbon increases with the increase of prepared temperature, but decreases with the increase of pH value and ionic strength. Therefore, the hydrothemal carbon prepared from cornstalk can effectively adsorb Atrazine in water, which has a good application prospect. The experimental results provide theoretical basis and data support for reuse of  cornstalk and water purification.

Key words: cornstalk; , hydrothermal carbon; , structural characterization; , Atrazine; , adsorption characteristics