Adsorption of ruthenium (III) from acidic aqueous solution by Fe 3 O 4 and Fe 3 O 4 @MnO 2 composites was studied by a batch equilibrium method at room temperature. Mass distribution coefficients of Ru(III) were determined in the system of Fe 3 O 4 and Fe 3 O 4 @MnO 2 in solutions of HCl and HNO 3 (concentration range from 0.01 to 0.5 mol L −1 ). The selectivity of ruthenium sorption in the developed systems was checked with the use of other elements. Recovery of ruthenium ions after separation process with Fe 3 O 4 @MnO 2 from tap water samples was examined. The ruthenium adsorbed on the Fe 3 O 4 @MnO 2 surface could be readily separated from diluted acid solutions by an external magnetic field. Results suggest that Fe 3 O 4 @MnO 2 can be a new, promising sorbent for efficient removal of ruthenium from aqueous solutions.

中文翻译：

---

Fe3O4和Fe3O4@MnO2在盐酸和硝酸中钌吸附的对比研究

通过分批平衡法在室温下研究了 Fe 3 O 4 和 Fe 3 O 4 @MnO 2 复合材料从酸性水溶液中吸附钌 (III)。Ru(III) 的质量分布系数在Fe 3 O 4 和Fe 3 O 4 @MnO 2 体系中的HCl 和HNO 3 溶液（浓度范围为0.01 至0.5 mol L -1 ）中确定。使用其他元素检查开发系统中钌吸附的选择性。检测了用 Fe 3 O 4 @MnO 2 从自来水样品中分离过程后钌离子的回收率。吸附在 Fe 3 O 4 @MnO 2 表面的钌可以很容易地通过外部磁场从稀酸溶液中分离出来。结果表明，Fe 3 O 4 @MnO 2 可以成为一种新的、有前途的吸附剂，用于从水溶液中有效去除钌。