Abstract:In order to explore adsorption performance of bentonite on uranium-containing wastewater, bentonite was pre-modified by sodium, and then organically modified by octadecyl trimethyl ammonium chloride (STAC). Effects of pH value of simulated uranium-containing wastewater, ratio of solid to liquid, reaction time and temperature, and initial concentration of simulated uranium-containing wastewater on adsorption of U(Ⅵ) by STAC organic modified bentonite were investigated, and adsorption kinetics and adsorption isothermal curve of bentonite were explored. The results show that adsorption material has the best effect on treatment of uranium-containing simulated wastewater and the maximum adsorption rate is 99.52% under the conditions including pH value of 7.04, ratio of solid to liquid of 4.0 g/L, reaction time of 480 min, reaction temperature of 318.15 K, and initial concentration of uranium-containing wastewater of <10 mg/L. Pseudo-second-order kinetic equation and Langmuir isothermal adsorption model are more suitable to clarify adsorption process of U (Ⅵ) on STAC organic modified bentonite, indicating that the reaction is dominated by chemical adsorption and is monolayer adsorption. The maximum adsorption capacity of Langmuir fitting is about 198.73 mg/g.