Abstract: To find the effects of immobilizing activated carbon made by activated carbon and Na-alginate as embedding agents biosorption performances on U(Ⅵ)，biosorption experiment was conducted on immobilizing activated carbon biosorption on U(Ⅵ).Results showed that at the solution initial pH=5.0，initial concentration of uranium is 0.4 mg/L，the adsorbent dosage is 0.7 g/L，adsorption equilibrium will obtained for 6 h，uranium adsorption quantity is 1.7 mg/g，uranium adsorption rate is 84.50%.Research of adsorption mechanism revealed that the adsorption of U(Ⅵ) by immobilized activated carbon fixes the Langmuir model and pseudo-second dynamics model.

Key words: Immobilizing activated carbon micro-ball, Adsorption, Uranium(Ⅵ)