Abstract: In order to investigate the adsorption of U(Ⅵ) on jarosite from solution, jarosite was synthesized using a one-step hydrothermal method, and characterized by X-ray diffraction(XRD), Raman spectrum, infrared spectroscopy(FTIR) and scanning electron microscope(SEM) technologies in detail. The effects of solution pH, ionic strength, solid-to-liquid ratio and initial U(Ⅵ) concentration on the adsorption process were studied using batch adsorption methods. The results show that the removal of U(Ⅵ) is deeply dependent on pH but independent of ionic strength, indicating that the adsorption of U(Ⅵ) is dominant by inner surface complexation. The adsorption basically reaches equilibrium within 100 min, and is in accordance with the pseudo-second-order kinetic model. The adsorption isotherms are well described by Langmuir isotherm model, indicating that the adsorption of U(Ⅵ) is monolayer coverage. The optimal adsorption conditions are as follows: solid-to-liquid ratio 1.0 g/L, initial concentration of U(Ⅵ) 0.42 mmol/L, temperature of 298 K, and solution pH of 7.0. The adsorption capacity at equilibrium is (76.0±1.4) mg/g (n=3), and the removal percentage reaches (88.0±1.3)%(n=3). The above results indicate that jarosite can be used as a potential adsorption material for the treatment of wastewater containing U(Ⅵ).