Abstract
Nuclear power could continue to be a reliable and carbon-free energy source at least from a near-term perspective. In addition to the safety issues, another risk that may threaten the sustainability of this technology is the uranium supply disruption. As opposed to the land-based deposits, the ocean contains 1,000 times more uranium reserves and provides a more abundant resource for uranium. However, due to the very low concentration and presence of many other metal ions as well as the accumulation of microorganisms, the development of uranium extraction technology faces enormous challenges. Here we report a bifunctional polymeric peptide hydrogel that shows not only strong affinity to and selectivity for uranium in seawater but also remarkable resistance against biofouling. Detailed characterizations reveal that the amino acid in this peptide material serves as the binding ligand, and uranyl is exclusively bound to the oxygen atoms. Benefiting from its broad-spectrum antimicrobial activity, the present polymeric adsorbent can inhibit the growth of approximately 99% of marine microorganisms. Measurements in natural seawater show that this peptide material delivers an impressive extraction capacity of 7.12 mg g−1 and can be reused. This work opens a new direction for the design of low-cost and sustainable materials for obtaining nuclear fuel.
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Acknowledgements
This work was supported by the Hainan Science and Technology Major Project (ZDKJ2019013 and ZDKJ2020011), the National Natural Science Foundation of China (41966009, U1967213, 51775152 and 61761016), the Hainan Provincial Natural Science Foundation of China (2019CXTD401) and the National Key R&D programme of China (2018YFE0103500).
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Y.Y., Q.Y. and N.W. conceived the research and designed the experiments. Q.Y., M.C., L.F., S.F., T.L., T.F. and B.Y. carried out the experiment. All authors analysed the data. Y.Y., N.W. and Z.G. contributed to the project discussions. Y.Y., Q.Y. and N.W. wrote the paper.
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Peer review information Nature Sustainability thanks Shengqian Ma, Shuao Wang and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Yuan, Y., Yu, Q., Cao, M. et al. Selective extraction of uranium from seawater with biofouling-resistant polymeric peptide. Nat Sustain 4, 708–714 (2021). https://doi.org/10.1038/s41893-021-00709-3
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DOI: https://doi.org/10.1038/s41893-021-00709-3
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