Radionuclide sorption on ettringite: experimental analysis and preliminary modelling exercise
Abstract Cement, widely used for radioactive waste confinement, contains ettringite, a calcium-aluminium-sulphate mineral crucial to concrete performance and radionuclide (RN) adsorption. The aim of this study is to analyse the sorption behaviour of 63 Ni, 133 Ba, 233 U, 152 Eu, 238 Pu, and 75 Se on ettringite under alkaline conditions and evaluate the results by geochemical modelling, accounting for their speciation under the experimental conditions. A one-site surface complexation model effectively reproduced the sorption isotherms for all RNs, while a double-site exchange model was proposed to explain Se sorption behavior.
Authors
- Oscar Almendros-Ginestà (ORCID: https://orcid.org/0000-0002-3911-0069)
- Miguel Garcı́a-Gutiérrez (ORCID: https://orcid.org/0000-0001-6551-2873)
- Tiziana Missana (ORCID: https://orcid.org/0000-0003-3052-5185)
Institutions
- Universidad Complutense de Madrid (ES)
Publication Details
- Journal
- Journal of Radioanalytical and Nuclear Chemistry
- Published
- 2025-09-10
- DOI
- https://doi.org/10.1007/s10967-025-10316-7
- Primary Topic
- Radioactive element chemistry and processing
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- European Commission
- Ministerio de Ciencia e Innovación