Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China.
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China.
Chemosphere. 2020 Sep;254:126671. doi: 10.1016/j.chemosphere.2020.126671. Epub 2020 Apr 6.
Efficient elimination of U(VI) from uranium wastewater is an urgent task for sustainable nuclear energy and environmental protection. In this study, magnetic graphene oxide decorated graphitic carbon nitride (mGO/g-CN) nanocomposite was prepared and used for photocatalytic reduction of U(VI) in wastewater under visible LED light irradiation for the first time. The batch experiments indicated that the mGO/g-CN (mGCN) nanocomposite could efficiently reduce U(VI) under visible LED light, and a high U(VI) extraction capacity of 2880.6 mg/g was obtained with an extraction efficiency of 96.02%. The transmission electron microscopy (TEM) elemental mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses demonstrated that the soluble U(VI) was immobilized by transforming it to metastudtite ((UO)O·2HO) by mGCN nanocomposite under visible LED light irradiation. This work indicated that the mGCN is a promising visible light catalyst for treatment of uranium wastewater.
高效去除含铀废水中的 U(VI) 是可持续核能和环境保护的当务之急。在这项研究中，首次制备了磁性氧化石墨烯修饰的石墨相氮化碳（mGO/g-CN）纳米复合材料，并将其用于可见光 LED 光照射下废水中 U(VI) 的光催化还原。批处理实验表明，mGO/g-CN（mGCN）纳米复合材料在可见光 LED 下能有效还原 U(VI)，并获得了 2880.6 mg/g 的高 U(VI)萃取容量和 96.02%的萃取效率。透射电子显微镜（TEM）元素映射、X 射线光电子能谱（XPS）和 X 射线衍射（XRD）分析表明，在可见光 LED 光照射下，可溶性 U(VI) 通过 mGCN 纳米复合材料转化为钠铀云母（(UO)O·2HO）而被固定。这项工作表明，mGCN 是一种很有前途的可见光催化剂，可用于处理含铀废水。
