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  • Author or Editor: F. Mekhail x
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Abstract  

The concentration dependence of the kinetics and equilibrium characteristics for the exchange of cesium ions on cobalt hexacyanocobaltate(III) has been studied. It is found that the rate of cesium sorption increases with decreasing cesium concentration in solution. The exchange reaction proceeds via two stages, the first stage is rather fast followed by a much slower one. The equilibrium characteristics of the distribution coefficients for cesium are interpreted in terms of the Langmuir-Hückel isotherm. The heat of sorption and activation energy are determined from the temperature dependence of the exchange reaction.

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Abstract  

Two chemical processes involving precipitation of cesium from waste solutions with iron(II)hexacyanocobaltate(III) and triphenylcyanoborate have been conducted. Various parameters have been investigated such as pH, molar ratio of Fe2+/Co(CN) 63− , molar ratio of triphenylcyanoborate to cesium and the nature of the simulated wastes. High percentage of cesium removal from different waste solutions has been achieved by using iron(II)hexacyanocobaltate(III). Precipitation of cesium with triphenylcyanoborate depends mainly on the concentration of triphenylcyanoborate and cesium as well as the molar ratio in solution. Triphenylcyanoborate can be used as a selective precipitant for cesium in both acidic and alkaline solution of pH not more than 10.

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