Abstract: The influencing factors, adsorption kinetics and adsorption isotherm of uranium adsorption on chitosan were investigated by experiments. The result shows that when the solution has an initial uranium mass concentration of 1 000 mg/L, a pH value of around 5, a chitosan dosage of 2.0 g, and a solid-liquid ratio of 1∶50, and the adsorption time is 120 min, the maximum uranium removal by chitosan can be 94% and the adsorption capacity is 1.43 mg/g. Its adsorption process is more like a second-order reaction, with a correlation coefficient of 0.999 2~0.999 7, and its adsorption isotherm is more in conformity with Langmuir equation，with a correlation coefficient of 0.997 2~0.998 4.

Key words: Chitosan, Uranium, Adsorption mechanism