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Efficient uranium removal from strongly acidic nuclear waste is crucial for sustainable nuclear energy, yet extreme acidity greatly challenges extraction. In order to provide a solution for uranium removal from strongly acidic waste, a phosphonic acid polymer, P(VPA-TEGDMA), was synthesized via solvothermal copolymerization of vinylphosphonic acid (VPA) and triethylene glycol dimethacrylate (TEGDMA). P(VPA-TEGDMA) demonstrated exceptional acid stability and outstanding adsorption performance for uranium in strongly acidic conditions. P(VPA-TEGDMA) achieved a maximum uranium adsorption capacity of 339.6 mg·g –1 in 4 mol L –1 HNO 3, surpassing most reported adsorbents. In addition, the adsorbent exhibited good selectivity and maintained a high adsorption performance for uranium after 5 adsorption–desorption cycles. An adsorption mechanism study revealed that uranyl ions were coordinated tightly by P═O groups in the polymer. This work offers insights for designing robust phosphonic acid polymer adsorbents for uranium extraction to tackle nuclear waste management challenges in highly acidic environments.
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Wu et al. (2025) studied this question.
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