Abstract
Adsorbents with the combination of magnetic separation and removal performance are expected for reducing the adverse impact of nuclear pollution. In this study, the core–shell Fe3O4@polydopamine (Fe3O4@PDA) was successfully synthesized and used for removal of uranium (U(VI)) ion from aqueous solution. The abundant N-containing groups derived from PDA exist as the chelate sites for U(VI) and contribute greatly for U(VI) removal. Experimental results show that Fe3O4@PDA (56.39 mg g–1) exhibits greater sorption capacity for U(VI) removal compared with the pure Fe3O4 (9.17 mg g–1). The sorption isotherm can be well fitted with Freundlich model and the sorption process is endothermic and spontaneous. The removal of U(VI) can be explained by the complexation of U(VI) with –NH–, –NH2 and C–O in the surface of Fe3O4@PDA by X-ray photoelectron spectroscopy (XPS) analysis.
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Acknowledgements
The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (21876047, U1607102, 21777039), Thousand Talents Plan of Qinghai province and the Fundamental Research Funds for the Central Universities (2019MS040).
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Feng, J., Cai, Y., Wang, X. et al. Designed Core–Shell Fe3O4@Polydopamine for Effectively Removing Uranium(VI) from Aqueous Solution. Bull Environ Contam Toxicol 106, 165–174 (2021). https://doi.org/10.1007/s00128-020-02883-0
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DOI: https://doi.org/10.1007/s00128-020-02883-0