Selective removal of cesium from highly concentrated sodium nitrate neutral solutions by potassium nickel hexacyanoferrate(II)-loaded silica gels
- Tohoku Univ., Sendai (Japan). Inst. for Advanced Materials Processing
- Tohoku National Industrial Research Inst., Sendai (Japan)
Potassium nickel hexacyanoferrate(II) (KNiFC)-loaded silica gels were prepared by successive impregnation of macro pores with Ni(NO{sub 3}){sub 2} and K{sub 4}Fe(CN){sub 6} solutions. The KNiFC precipitates uniformly dispersed in the matrix of silica gel, and the loading percentage of KNiFC increased with the number impregnation cycles. The uptake of Cs{sup +} on KNiFC-loaded silica gels (SLFC) attained equilibrium within 2 d, and relatively large distribution coefficients of Cs{sup +}, K{sub d,Cs}, above 10{sup 4} cm{sup 3}/g, were obtained even in the presence of 5 M NaNO{sub 3}. The ion exchange of K{sup +} {r_equilibrium} Cs{sup +} in SLFC followed a Langmuir-type isotherm and the maximum uptake amount of Cs{sup +} was estimated to be 0.305 mmol/g. The breakthrough curve of Cs{sup +} through a column packed with SLFC exhibited a favorable S-shaped profile. This exchanger proved to be effective for the selective removal of radioactive cesium from neutral waste solutions containing highly concentrated NaNO{sub 3}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 343797
- Journal Information:
- Solvent Extraction and Ion Exchange, Vol. 17, Issue 2; Other Information: PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
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