Artículo
Interaction of Eu-isotopes with saponite as a component of the engineered barrier
Autor/es | Alba Carranza, María Dolores
Castro Arroyo, Miguel Ángel Chaín, P. Hurtado, Santiago Orta Cuevas, María del Mar Pazos, Mariana Carolina Villa, María |
Departamento | Universidad de Sevilla. Departamento de Química Inorgánica |
Fecha de publicación | 2011 |
Fecha de depósito | 2019-02-01 |
Publicado en |
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Resumen | Bentonite is accepted as the best clay material in the engineered barrier of deep geological repositories (DGRs) for radioactive waste disposal. In recent years, the interactions between a wide range of rare-earth (REE) ... Bentonite is accepted as the best clay material in the engineered barrier of deep geological repositories (DGRs) for radioactive waste disposal. In recent years, the interactions between a wide range of rare-earth (REE) cations and smectites have been studied. A combined study of stable europium and radioactive isotopes is reported here. Saponite was subjected to hydrothermal reactions with stable and radioactive (152Eu) europium ions under subcritical conditions. The structural changes of saponite were evaluated by XRD and SEM. The effect of temperature and reaction time on the changes was quantified by measuring 152Eu through gamma spectrometry. The reaction between europium and saponite was a first-order reaction. The presence of Eu in the precipitate in an amount much higher than the cation exchange capacity of saponite confirmed participation of chemical reactions or surface adsorption in the europium immobilization, even at temperatures as low as 150°C. The reaction rate constant indicated that an 8- to 9-month period was needed for the completion, without significant changes, of the europium/saponite chemical reaction under the subcritical conditions of 200°C and 350°C. |
Agencias financiadoras | Ministerio de Ciencia e Innovación (MICIN). España |
Identificador del proyecto | 300/PC08/3-01.1
CTQ2010-14874 |
Cita | Alba Carranza, M.D., Castro Arroyo, M.Á., Chaín, P., Hurtado, S., Orta-Cuevas, M.d.M., Pazos, M.C. y Villa, M. (2011). Interaction of Eu-isotopes with saponite as a component of the engineered barrier. Applied Clay Science, 52, 253-257. |
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