Photocatalytic reduction of U(VI) in wastewater by mGO/g-C3N4 nanocomposite under visible LED light irradiation

被引：61
作者：
Dai, Zhongran [1 ]
Sun, Yusu [1 ]
Zhang, Hui [1 ]
Ding, Dexin [1 ]
Li, Le [1 ]
机构：
[1] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China
来源：
CHEMOSPHERE | 2020年 / 254卷
基金：
中国国家自然科学基金;
关键词：
Uranium; Removal; Photoreduction; Wastewater; GRAPHENE OXIDE; AQUEOUS-SOLUTION; HETEROGENEOUS ACTIVATION; EFFICIENT REMOVAL; URANIUM(VI); ENRICHMENT; G-C3N4; IONS;
D O I：
10.1016/j.chemosphere.2020.126671
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
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-C3N4) 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-C3N4 (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 ((UO2)O-2 center dot 2H(2)O) 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. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：7
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