Cesium sorption on UO2: systematic experimental and model studies for surface sites characterization
The maximum sorption capacity of Cs+ onto the powdered UO2 surface, obtained from experimental sorption isotherms (0.1 mol L−1 NaClO4 at 25 °C and pH=6.3), was found to be 6.3·10−5 mol·g−1. Potentiometric titration data, also in 0.1 mol L−1 NaClO4, were modeled using the double diffuse layer model,...
| Autores: | , , |
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| Tipo de recurso: | conjunto de datos |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/392595 |
| Acceso en línea: | http://hdl.handle.net/10261/392595 |
| Access Level: | acceso abierto |
| Palabra clave: | UO2 Surface sites density Acid–base titration Deep geological repository Spent nuclear fuel Geological disposal |
| Sumario: | The maximum sorption capacity of Cs+ onto the powdered UO2 surface, obtained from experimental sorption isotherms (0.1 mol L−1 NaClO4 at 25 °C and pH=6.3), was found to be 6.3·10−5 mol·g−1. Potentiometric titration data, also in 0.1 mol L−1 NaClO4, were modeled using the double diffuse layer model, yielding acidity constants of pKa1= 3.2 ± 0.15 and pKa2= -10.8 ± 0.15. The dissolution of UO2 at pH between 2 and 12 was measured at a solid-to-liquid ratio of 40 g·L−1 in 0.1 mol L−1 NaClO4 and the determined solubility product obtained was pKs,U(OH)4 = -(3.2 ± 0.2). |
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