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Task-Specific Tailored Cationic Polymeric Network with High Base-Resistance for Unprecedented ⁹⁹TcO₄ ^- Cleanup from Alkaline Nuclear Waste.

ABSTRACT: Direct removal of ⁹⁹TcO₄ ^- from alkaline nuclear waste is desirable because of the nuclear waste management and environmental protection relevant to nuclear energy but is yet to be achieved given that combined features of decent base-resistance and high uptake selectivity toward anions with low charge density have not been integrated into a single anion-exchange material. Herein, we proposed a strategy overcoming these challenges by rationally modifying the imidazolium unit of a cationic polymeric network (SCU-CPN-4) with bulky alkyl groups avoiding its ring-opening reaction induced by OH^- because of the steric hindrance effect. This significantly improves not only the base-resistance but also the affinity toward TcO₄ ^- as a result of enhanced hydrophobicity, compared to other existing anion-exchange materials. More importantly, SCU-CPN-4 exhibits record high uptake selectivity, fast sorption kinetics, sufficient robustness, and promising reusability for removing ⁹⁹TcO₄ ^- from the simulated high-level waste stream at the U.S. Savannah River Site, a typical alkaline nuclear waste, in both batch experiment and dynamic column separation test for the first time.

SUBMITTER: Li J

PROVIDER: S-EPMC8393213 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:99Tc is one of the most problematic fission products in the nuclear fuel cycle owing to its large inventory in used nuclear fuel, long half-life, potential radiation hazard, high environmental mobility of its major species 99TcO4 -, and its redox-active nature. Ideally, 99TcO4 - should be removed at the first stage, when the used fuel rods are dissolved in highly concentrated nitric acid solution, which can substantially reduce its interference with the solvent extraction process through catalytic redox reactions with the key actinides and diminish the chance of discharge into the environment as the volatile species during the waste vitrification process. However, this task cannot be achieved by any of the reported anion-scavenging materials including traditional polymeric anion-exchange resins, inorganic cationic framework materials, and recently developed cationic metal-organic framework materials, because they either are not stable under the extreme conditions of the combined high acidity and strong radiation field or do not possess the required uptake selectivity towards 99TcO4 - in the presence of a huge excess of competing anions such as NO3 - and SO4 2-. Herein, we present the first study of 99TcO4 - removal under extreme conditions by a two-dimensional conjugated cationic covalent organic framework material, SCU-COF-1. This material exhibits ultrahigh acid stability, great resistance towards both large-dose β and γ irradiation and unprecedented 99TcO4 - uptake capabilities including extremely fast sorption kinetics (sorption equilibrium can be reached within 1 min), ultrahigh uptake capacity (702.4 mg g-1 for the surrogate ReO4 - at a slightly elevated temperature), and good anion-exchange selectivity towards 99TcO4 -. These excellent features endow SCU-COF-1 with the practical capabilities of separating 99TcO4 - from both simulant highly acidic fuel reprocessing solutions (3 M nitric acid) and low-activity waste streams at the US legacy nuclear site. The anion-exchange mechanism and the 99TcO4 - uptake selectivity are further demonstrated and clearly visualized by the molecular dynamics simulation investigations.

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Task-Specific Tailored Cationic Polymeric Network with High Base-Resistance for Unprecedented ⁹⁹TcO₄ ^- Cleanup from Alkaline Nuclear Waste.

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Dataset Information

Task-Specific Tailored Cationic Polymeric Network with High Base-Resistance for Unprecedented 99TcO4 - Cleanup from Alkaline Nuclear Waste.

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OmicsDI is part of the ELIXIR infrastructure

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Task-Specific Tailored Cationic Polymeric Network with High Base-Resistance for Unprecedented ⁹⁹TcO₄ ^- Cleanup from Alkaline Nuclear Waste.