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.

中文翻译：

---

设计用于有效去除水溶液中铀（VI）的核壳型Fe3O4 @ Polydopamine。

结合磁性分离和去除性能的吸附剂有望减少核污染的不利影响。在这项研究中，成功​​地合成了核壳型Fe3O4 @ polydopamine（Fe3O4 @ PDA），并用于从水溶液中去除铀（U（VI））离子。源自PDA的丰富的含N基团作为U（VI）的螯合位点存在，并且对U（VI）的去除有很大贡献。实验结果表明，与纯Fe3O4（9.17 mg g-1）相比，Fe3O4 @ PDA（56.39 mg g-1）对U（VI）的去除具有更大的吸附能力。吸附等温线可以很好地适应Freundlich模型，并且吸附过程是吸热的并且是自发的。U（VI）的去除可以通过U（VI）与-NH-的络合来解释，