Abstract
Nickel alginate microcapsules enclosing inorganic ion-exchangers (ferrocyanide and clmoptilolite) and organic extractant (DEIIPA) were prepared by gelling the kneaded sols. The microcapsules with various shapes such as granule, column and film were easily obtained by changing the gelling methods. The metal ions of Cs+, Sr2+, Y3+, Eu3+ and Am3+ were readily adsorbed on the microcapsule within 6 h and relatively high uptake percentages above 90 % were obtained. The uptake rate was independent of coexisting NaNO3 concentration up to 1 M and no appreciable swelling was observed. The uptake of metal ions followed a Langmuir-type adsorption equation and the uptake capacities of Cs+, Sr2+, Y3+ and Eu3+ were estimated to be 0.063, 0.011, 0.051 and 0.149 mmol/g, respectively. The microcapsules were thus effective for the simultaneous removal of radioactive nuclides from waste solutions.
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