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Updated: Feb 11, 2026

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Published on: May 1, 2018
Retention of cesium and strontium by uranophane, Ca(UO2)2(SiO3OH)2·5H2O
Alexandra Espriu-Gascon1, Javier Giménez1, Ignasi Casas1
1Department of Chemical Engineering, Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, Eduard Maristany, 10-14, 08019 Barcelona, Spain.
Abstract:
This work determines the capacity of uranophane, one of the long-term uranyl secondary solid phases formed on the spent nuclear fuel (SNF), to retain radionuclides (cesium and strontium) released during the dissolution of the SNF. Sorption was fast in both cases, and uranophane had a high sorption capacity for both radionuclides (maximum sorption capacities of 1.53·10-5 mol m-2 for cesium and 3.45·10-3 mol m-2 for strontium). The high sorption capacity of uranophane highlights the importance of the formation of uranyl silicates as secondary phases during the SNF dissolution, especially in retaining the release of radionuclides not retarded by other mechanisms such as precipitation.
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