Efficient and selective uranium electrochemical extraction over flexibly engineered bi-functional Polypyrole@MoSe2@MXene

作者：Yanmeng Cai, Pengze Li, Qingxi Yuan, Jinsheng Zhao, Panagiotis Tsiakaras · 发表于：Chemical Engineering Journal · 年份：2025 · DOI：10.1016/j.cej.2025.160496 · 被引用次数：28 · 研究领域：Radioactive element chemistry and processing、Chemical Synthesis and Characterization、Nuclear Materials and Properties

The extraction of uranium from seawater is critical for addressing the global energy crisis by harnessing uranium resources. Capacitive deionization (CDI), an electrochemical extraction technique, shows significant promise for the selective capture of uranium by the merits of high efficiency, cost-effectiveness, and energy-saving characteristics. However, it is still a challenge for CDI to explore novel materials with high affinity for rapid extraction and recovery uranium. Herein, the ternary composite polypyrrole@MoSe 2 @MXene (PPy@MoSe 2 @MXene) is successfully designed with the bi-functional properties for uranium extraction. The pseudo-capacitive intercalation behavior promotes the swift transfer of uranium ions into the interlayer of MoSe 2 and MXene, while the ion-exchange capacities and nitrogen-rich active sites of PPy aid in reducing uranium from its hexavalent state U(VI) to the less soluble tetravalent state U(IV). Benefiting from this, the PPy@MoSe 2 @MXene composite demonstrates an impressive uranium extraction capacity of 659 mg g −1 and prominent reusability with 84 % capacity retention after 10 cycles. In-situ Raman spectroscopy further confirms the transformation of uranium species during the CDI process. The selectivity results in complex mixed solution and density functional theory (DTF) underscore that the high selective uranium extraction of PPy@MoSe 2 @MXene can be ascribed to the synergistic effect of PPy, MoSe 2 , and MXene, which provides convenient ...