Abstract
The effectiveness of K2Zn3[Fe(CN)6]2 (KZnHCF) for the radioactive cesium (R-Cs) decontamination from wood ash extract is studied. Because the ash-washing solution is of high pH and high K+-concentration, adsorbent with high pH tolerance and selectivity for Cs+ over coexistent K+ is required. For this purpose, we evaluated the effectiveness of KZnHCF, Prussian blue (PB), and zeolite. With 10,000mg/L of K+-concentration, the distribution coefficient, Kd of KZnHCF, PB, and zeolite were 719, 4400, and 210mL/g, respectively. Regarding the pH-effect, KZnHCF shows good Cs adsorption even at pH 12, in contrary, PB is effective only at pH<9. Actually for the decontamination of ash washed solution with 212Bq/L of total R-Cs activity and 1000mL/g of solution to adsorbent ratio, only KZnHCF could reduce the radioactivity to less than 60Bq/L, the standard of 134Cs for public waters in Japan. In addition, a theory for predicting the R-Cs adsorption ratio based on the initial concentration of K+, by using the equilibrium coefficient Keq=71.6 for the ion-exchange between K+ and Cs+ in KZnHCF is proposed.
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