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http://dx.doi.org/10.7733/jnfcwt.2022.012

Sorption of Eu on MX-80 Bentonite in Na-Ca-Cl Brine Solutions  

Yang, Jieci (McMaster University)
Racette, Joshua (McMaster University)
Garcia, Fabiola Guido (McMaster University)
Nagasaki, Shinya (McMaster University)
Yang, Tammy (Nuclear Waste Management Organization)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.20, no.2, 2022 , pp. 151-160 More about this Journal
Abstract
The sorption of Eu on MX-80 bentonite in Na-Ca-Cl solutions is investigated at a molal proton concentration (pHm) range of 3 to 10 and an ionic strength (I) range of 0.1 to 6 m (mol·kgw-1). The sorption equilibrium of Eu on MX-80 is achieved within 14 to 21 d at I = 0.1 and 6 m. The sorption distribution coefficient (Kd) values of Eu for MX-80 increase as pHm increases from 3 to 6 for all I values, and they are independent of pHm between 8 and 10 at I ≥ 0.5 m. Meanwhile, at I = 0.1 m, the Kd value at pHm = 10 is slightly lower than those at pHm = 8 and 9. The Kd values are not affected by the I values between 0.5 m and 6 m, whereas the Kd value at I = 0.1 m is greater than those at I ≥ 0.5 m, except at pHm = 10. A two-site protolysis nonelectrostatic surface complexation and cation exchange sorption model is applied to the Eu sorption data for I ≤ 4 m, and the equilibrium constants of the sorption reactions are estimated.
Keywords
Eu; MX-80 bentonite; Sorption; pH and ionic strength dependences; Sorption distribution coefficient; Two-site protolysis nonelectrostatic surface complexation and cation exchange sorption model (2SPNE SC/CE model);
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