Radionuclide contamination has become an urgent problem with the development of nuclear power plants. Herein, chemical-decorated core-shell magnetic manganese dioxide (denoted as Fe₃O₄@[email protected]₂) composites were synthesized via transforming KMnO₄ to MnO₂ on the carbon-covered magnetite (Fe₃O₄@C) microsphere surface. It was employed to remove U(VI) and Eu(III) ions from aqueous solution under various conditions. The kinetic adsorption data were well simulated by the pseudo-second-order model and adsorption isotherms were fitted well by Langmuir model. Moreover, the maximum uptake capacities were up to 77.71 mg/g for U(VI) and 51.01 mg/g for Eu(III) at pH = 5.0 and T = 298 K. Adsorption behavior was strongly related to pH values but weakly affected by ionic strength, implying that the interaction of U(VI)/Eu(III) with Fe₃O₄@[email protected]₂ was mainly dominated by inner-sphere surface complexation. XPS analysis illustrated that the interaction of Eu(III)/U(VI) with Fe₃O₄@[email protected]₂ was associated with the strong metal bonds (MnO), hydroxyl bonded on metal (Mn-OH) and carboxyl groups (-COOH) by surface complexation and zeta potential results implied that the adsorption process was governed by electrostatic attraction. This research highlighted the outstanding performance of Fe₃O₄@[email protected]₂ in eliminating Eu(III)/U(VI) ions from aqueous solutions, which was of great significance in the future application in radionuclides' pollution treatment.

随着核电厂的发展，放射性核素污染已成为迫在眉睫的问题。在此，通过在碳覆盖的磁铁矿（Fe ₃ O ₄上将KMnO ₄转化为MnO ₂），合成了化学修饰的核壳磁性二氧化锰（表示为Fe ₃ O ₄ @ [受电子邮件保护] ₂）复合材料。@C）微球表面。它用于在各种条件下从水溶液中除去U（VI）和Eu（III）离子。用拟二阶模型很好地模拟了动力学吸附数据，用Langmuir模型很好地拟合了吸附等温线。此外，在pH = 5.0和T  = 298 K时，U（VI）的最大吸收容量高达77.71 mg / g，Eu（III）的最大吸收容量高达51.01 mg / g 。吸附行为与pH值密切相关，但受pH值的影响较小离子强度，表明U（VI）/ Eu（III）与Fe ₃ O ₄ @ [受电子邮件保护] ₂的相互作用主要受内球表面络合作用的支配。XPS分析表明Eu（III）/ U（VI）与Fe ₃ O ₄的相互作用@ [受电子邮件保护] ₂通过表面络合作用与强金属键（Mn O），羟基键合在金属（Mn-OH）和羧基（-COOH）上，ζ电位结果表明吸附过程受静电控制吸引力。这项研究突出了Fe ₃ O ₄ @ [email protected] ₂在从水溶液中消除Eu（III）/ U（VI）离子方面的卓越性能，这对未来在放射性核素污染处理中的应用具有重要意义。