Yang Aili, Wang Zhijun, Zhu Yukuan
Institute of Materials, China Academy of Engineering Physics, P.O. Box 9071-7, Mianyang, 621907, China.
Sci Rep. 2021 Apr 19;11(1):8440. doi: 10.1038/s41598-021-86768-0.
In this work, we reported for the first time a novel magnetic composite graphene oxide/FeO/glucose-COOH (GO/FeO/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/FeO/GC exhibits an excellent adsorption performance and fast solid-liquid separation for uranium from aqueous solution. GO/FeO/GC (the maximum adsorption capacity (Q) was 390.70 mg g) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na, K, Mg, Ca, and Al, on the U(VI) removal efficiency of GO/FeO/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH = 11.57 kJ mol and ΔG < 0) for GO/FeO/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.
在本工作中，我们首次报道了一种新型磁性复合氧化石墨烯/氧化亚铁/葡萄糖-COOH（GO/FeO/GC），它是通过水热碳化由葡萄糖简便制备而成，并进一步与氧化石墨烯（GO）复合。对样品的化学和结构性质进行了研究。通过批量铀吸附实验，磁性复合GO/FeO/GC对水溶液中的铀表现出优异的吸附性能和快速的固液分离能力。GO/FeO/GC（最大吸附容量（Q）为390.70 mg/g）对U(VI)的吸附容量和去除率（>99%）均优于葡萄糖-COOH（GC）和磁性GC（MGC）。考察了共存离子如Na、K、Mg、Ca和Al对GO/FeO/GC去除U(VI)效率的影响。所制备吸附剂的平衡吸附和吸附速率分别很好地符合Langmuir模型和准二级动力学模型。GO/FeO/GC的热力学参数（ΔH = 11.57 kJ/mol且ΔG < 0）表明U(VI)的吸附过程是放热且自发的。因此，本研究为制备低成本、高效率且快速分离的磁性复合材料以从水溶液中去除U(VI)提供了一种简便策略。
