Selective removal of cesium from sodium nitrate solutions by potassium nickel hexacyanoferrate-loaded chabazites
- Tohoku Univ., Sendai (Japan). Inst. for Advanced Materials Processing
- Tohoku National Industrial Research Inst., Sendai (Japan)
Potassium nickel hexacyanoferrate(II)s (KNiFC) were incorporated in the porous matrix of chabazite by successive impregnation with Ni(NO{sub 3}){sub 2} and K{sub 4}Fe(CN){sub 6}. The loading percentage of KNiFC crystals on chabazite increased with repeated times of impregnation. The ion-exchange equilibrium of Cs{sup +} in KNiFC-loaded chabazite (CFC) was attained within 2 days. Relatively large distribution coefficients of Cs{sup +}, K{sub d,Cs}, above 10{sup 4} cm{sup 3}/g were obtained, irrespective of coexisting NaNO{sub 3} concentration. There is a large difference between the K{sub d} value of {sup 137}Cs and those of other nuclides; the separation factor of Cs/Sr ({alpha}{sub Cs/Sr} = K{sub d,Cs}/K{sub d,Sr}) was estimated to be above 10{sup 4}. The breakthrough curve for Cs{sup +} through the column packed with CFC exhibited a symmetrical S-shaped profile, and this exchanger proved to be effective for the selective removal of radiocesium from waste solutions containing highly concentrated NaNO{sub 3}.
- OSTI ID:
- 323984
- Journal Information:
- Separation Science and Technology, Vol. 34, Issue 1; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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