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• W4386592355 abstract "Abstract The selective removal of the β‐emitting pertechnetate ion ( 99 TcO 4 − ) from nuclear waste streams is technically challenging. Herein, a practical approach is proposed for the selective removal of 99 TcO 4 − (or its surrogate ReO 4 − ) under extreme conditions of high acidity, alkalinity, ionic strength, and radiation field. Hollow porous N‐doped carbon capsules loaded with ruthenium clusters (Ru@HNCC) are first prepared, then modified with a cationic polymeric network (R) containing imidazolium‐N + units (Ru@HNCC‐R) for selective 99 TcO 4 − and ReO 4 − binding. The Ru@HNCC‐R capsules offer high binding affinities for 99 TcO 4 − /ReO 4 − under wide‐ranging conditions. An electrochemical redox process then transforms adsorbed ReO 4 − to bulk ReO 3 , delivering record‐high removal capacities, fast kinetics, and excellent long‐term durability for removing ReO 4 − (as a proxy for 99 TcO 4 − ) in a 3 m HNO 3 , simulated nuclear waste‐Hanford melter recycle stream and an alkaline high‐level waste stream (HLW) at the U.S. Savannah River Site (SRS). In situ Raman and X‐ray absorption spectroscopy (XAS) analyses showed that adsorbed Re(VII) is electrocatalytically reduced on Ru sites to a Re(IV)O 2 intermediate, which can then be re‐oxidized to insoluble Re(VI)O 3 for facile collection. This approach overcomes many of the challenges associated with the selective separation and removal of 99 TcO 4 − /ReO 4 − under extreme conditions, offering new vistas for nuclear waste management and environmental remediation." @default.
• W4386592355 created "2023-09-12" @default.
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• W4386592355 date "2023-09-10" @default.
• W4386592355 modified "2023-10-14" @default.
• W4386592355 title "Functional Carbon Capsules Supporting Ruthenium Nanoclusters for Efficient Electrocatalytic ⁹⁹TcO₄⁻/ReO₄⁻ Removal from Acidic and Alkaline Nuclear Wastes" @default.
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• W4386592355 doi "https://doi.org/10.1002/advs.202303536" @default.
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