ION-EXCHANGE PROPERTIES OF POTASSIUM NICKEL HEXACYANOFERRATE(II) COMPOUNDS

A series of nonstoichiometric compounds K 2 x Ni x/2 [NiFe(CN) 6 ]nH 2 O was prepared by varying Ni/Fe molar ratio from 0.1 to 100. The products had a face-centered cubic (fee) structure, and the lattice parameter slightly increased with decreasing K/Fe ratio. The uptake rate of Cs + was enhanced at...

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Bibliographic Details
Published in:Solvent extraction and ion exchange 1998-07, Vol.16 (4), p.1013-1031
Main Authors: MIMURA, Hitoshi, KAGEYAMA, Norihiro, AKIBA, Kenichi, YONEYA, Masayuki, MIYAMOTO, Yoichi
Format: Article
Language:English
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Summary:A series of nonstoichiometric compounds K 2 x Ni x/2 [NiFe(CN) 6 ]nH 2 O was prepared by varying Ni/Fe molar ratio from 0.1 to 100. The products had a face-centered cubic (fee) structure, and the lattice parameter slightly increased with decreasing K/Fe ratio. The uptake rate of Cs + was enhanced at lower K/Fe ratio below 1.32 and reached equilibrium within 8 h for the products with K/Fe below 0.86. The distribution coefficients of Cs + on the products were above 10 4 cm 3 /g in the presence of 1 mol/dm 3 Na + , K + or H + while those of other nuclides were less than 10 2 , indicating high selectivity of the product to Cs + . The uptake of Cs + followed a Langmuir-type isotherm and the maximum amount of Cs + adsorbed was evaluated to be 1.0 to 1.5 mmol/g. Cesium nuclides were efficiently removed from a simulated high-level liquid waste.
ISSN:0736-6299
1532-2262
DOI:10.1080/07366299808934566