Abstract:Nano-zero-valent nickel was prepared by liquid-phase reduction method and used to remove U(VI) from aqueous solution. Micro-morphologies of the materials before and after reaction were characterized by SEM and EDS. Removal mechanism was studied based on thermodynamics. The results show that nano-zero-valent nickel has good removal effect on U(VI) from aqueous solution. Removal rate and capacity of U(VI) is 98.44% and 182.372 mg/g respectively under the conditions including room temperature, pH value of 4.0, contact time of 60 min, ratio of solid to liquid of 0.3 g/L, and initial concentration of 50 mg/L. Particle size of nano-zero-valent nickel is obviously spherical with uniform dispersion. After reaction, surface morphology of the material change to irregular fragments accumulation and particle sizes become larger, and U elements appear in the material. Thermodynamic studies show that the reaction is spontaneous endothermic and irreversible with increasing entropy.