2026-06-02T05:00:06Z https://icatplus.esrf.fr/oaipmh/request

oai:icatplus.esrf.fr:inv/2053648821 2025-04-22T06:00:11.858Z

4.2 EI 10.15151/ESRF-ES-2053648821 Ursula ALONSO Ursula Alonso 0000-0002-2668-4725 Ursula ALONSO Ursula Alonso 0000-0002-2668-4725 Tiziana MISSANA Tiziana Missana 0000-0003-3052-5185 Tiziana MISSANA Tiziana Missana 0000-0003-3052-5185 Damien PRIEUR Damien Prieur 0000-0001-5087-0133 CARLA SOTO RUIZ Carla Soto Ruiz 0009-0002-8113-984X CARLA SOTO RUIZ Carla Soto Ruiz 0009-0002-8113-984X Example Institute 2028 Data from large facility measurement 2025-04-19T06:00:00Z/2025-04-22T06:00:00Z 2025-04-22T06:00:00Z I CC-BY-4.0 The aim of the project is to investigate the uptake of Se(IV) and U(VI) in chuckanovite (Fe2(OH)2CO3), an Fe(II)-carbonate hydroxide mineral, which can be formed under redox reducing conditions at the interface between the steel container and the bentonite clay barrier in a high-level radioactive waste repository. The characterisation of synthesised chuckanovite confirmed a 100% of Fe(II) in the structure. Batch sorption experiments, demonstrated that chuckanovite exhibits a high retention capacity for Se(IV) and U(VI) at pH 8.2, even in the presence of carbonates. The high Fe(II) content (which enhances redox reduction) and the presence of structural CO32- (which facilitates anionic exchange) can both contribute to the effective retention of radionuclides (RN). However, the formation of other surface complexes cannot be ruled out. Access to ROBL-BM20 beam line is deemed essential for the surface analysis of Se and U-chuckanovite samples and the understanding of retention mechanisms.