PhysicochemicaI Properties of Potassium Nickel Hexacyanoferrate(2)-Loaded Chabazites

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  • Physicochemical Properties of Potassium Nickel Hexacyanoferrate(II)-Loaded Chabazites.
  • PhysicochemicaI Properties of Potassium

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Insoluble hexacyanoferrate(II)s are well known to have an extremely strong affinity for Cs+(1), and they have been studied mainly in connection with the removal of 137Cs from radioactive waste solutions(2). Potassium nickel hexacyanoferrate(II)s (KNiFC) are readily obtained by precipitating Ni(NO3)2 with K4Fe(CN)6(3)(4), while they are composed of aggregates of very fine crystals and have insufficient mechanical stability during repeat sorption-desorption cycles. Several granulation methods have been proposed for modifying microcrystalline ferrocyanides into granular shape by freezing and thawing precipitated gels(5), or by binding precipitate particles with insoluble polymers(6), while these procedures for preparation were rather complicated and results were often not reproducible.<BR>In order to overcome these difficulties, we have developed a simplified method for incorporation of KNiFC crystals into the porous support of chabazite by successive impregnation of macro pores with Ni(NO3)2 and K4Fe(CN)6 solutions(7). For the practical application of this exchanger to the treatment of radioactive waste solutions, it is necessary to evaluate the physicochemical properties such as chemical and thermal stability. The present paper deals with the resistance of KNiFC-loaded chabazite (abbreviated as CFC) against acid and alkaline solutions and with the thermal transformation at high temperature in connection with the uptake behavior of Cs+

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