Work

Radionuclide sorption on ettringite: experimental analysis and preliminary modelling exercise

Year: 2025

Type: article

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.

Source: Journal of Radioanalytical and Nuclear Chemistry

DOI: 10.1007/s10967-025-10316-7

Authors: Oscar Almendros-Ginestà, Miguel García-Gutiérrez, Tiziana Missana

Institution: Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas

Language: English

Topic: Radioactive element chemistry and processing

Subfield: Inorganic Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,790

Funders: European Commission, Ministerio de Ciencia e Innovación, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, H2020 Euratom