Biosorption of ²³⁹Pu by immobilized Sargassum fusiforme

Sargassum fusiforme was immobilized with calcium alginates and its biosorption property to 239Pu was studied by batch and column methods. Biosorption equilibrium time of immobilized Sargassum fusiforme biosorbent to ²³⁹Pu is 120 min and biosorption efficiency is over 99.2% when the initial concentration of ²³⁹Pu is 21.5 kBq/L and pH is 2.5-5.0. After five repetition biosorption-desorption cycles biosorption efficiency is still over 98.0% when the velocity of flow is 2 mL/min in column experiment. Immobilized Sargassum fusiforme biosorbent is better to ²³⁹Pu due to its better chemical stability, mechanical strength, lower cost, high biosorption efficiency and repeated biosorption-desorption cycles.