Abstract
Coprecipitation of Cs+ and nickel potassium ferrocyanide (KNiFC) is an important water treatment method for radioactive wastewater containing Cs+. In this study, the effects of coprecipitation experimental conditions on Cs+ removal rate, coprecipitates compositions and particle sizes distribution of coprecipitates are investigated completely with coprecipitation experiments and characterization analyses. Results show that removal rate of Cs+ increases with dose of flocculant. The corresponding relationships between coprecipitates compositions with coprecipitation conditions (including Ni(NO3)2:K4Fe(CN)6 ratio, initial concentration of Cs+ and presence of competitive cations) indicate that ion-exchange between Cs+ and K+ is the main mechanism of coprecipitation, and Mg is introduced into coprecipitates and significantly promoted by presence of Cs+. Furthermore, particle sizes of coprecipitates increases with Ni(NO3)2:K4Fe(CN)6 ratio, flocculant dose, initial concentration of Cs+ and acidity of coprecipitation system with different mechanisms. The coprecipitates particle sizes also increase with the attend of Na+ and Mg2+.
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We acknowledge financial support from the National Natural Science Foundation of China (21771045, U1967219), the project of Young Talents of China National Nuclear Corporation.
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Jiao, C., Wang, G., Wang, J. et al. Effects of coprecipitation conditions on Cs+ removal, coprecipitate compositions and coprecipitate particle-size distribution in nickel potassium ferrocyanide systems. J Radioanal Nucl Chem 330, 293–303 (2021). https://doi.org/10.1007/s10967-021-07961-z
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DOI: https://doi.org/10.1007/s10967-021-07961-z