Enhanced Photocatalytic Removal of Uranium(VI) from Aqueous Solution by Magnetic TiO2/Fe3O4 and Its Graphene Composite
Enhanced Photocatalytic Removal of Uranium(VI) from Aqueous Solution by Magnetic TiO2/Fe3O4 and Its Graphene Composite
复制标题
磁性 TiO2/Fe3O4 及其石墨烯复合材料增强光催化去除水溶液中的铀 (VI)
DOI：
10.1021/acs.est.6b05313
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发表时间：
2017-05-16
影响因子：
11.4
通讯作者：
Shi, Wei-Qun
中科院分区：
文献类型：
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作者：
Li, Zi-Jie;Huang, Zhi-Wei;Shi, Wei-Qun
从环境保护和铀再利用的角度来看，从放射性废水中分离和回收铀是重要的。制备了磁性可捕集TiO 2/Fe 3 O 4及其石墨烯复合材料，并将其用于光催化去除水溶液中的U（VI）。结果表明，在紫外光照射下，TiO 2/Fe 3 O 4催化剂对U（VI）的光还原活性是纯TiO 2的19.3倍，这与TiO 2光电子还原Fe 3 O 4产生的Fe和Fe（II）密切相关.系统研究了铀的初始浓度、溶液pH值、离子强度、废水组成及有机污染物对TiO 2/Fe 3 O 4去除U（VI）的影响。实验结果表明，该催化剂在铀污染物的净化中具有良好的性能。由于石墨烯可以有效地吸引TiO 2光电子，从而减少它们向Fe 3 O 4的转移，因此与TiO 2/Fe 3 O 4相比，TiO 2/石墨烯/Fe 3 O 4复合物中Fe 3 O 4的光溶解可以大大减轻，使得该三元复合物具有更高的稳定性。此外，还采用扫描电子显微镜（SEM）、X射线衍射（XRD）、X射线吸收近边谱（XANES）和X射线光电子能谱（XPS）等手段进行了研究。反应机制。
The separation and recovery of uranium from radioactive wastewater is important from the standpoints of environmental protection and uranium reuse. In the present work, magnetically collectable TiO2/Fe3O4 and its graphene composites were fabricated and utilized for the photocatalytical removal of U(VI) from aqueous solutions. It was found that, under ultraviolet (UV) irradiation, the photoreactivity of TiO2/Fe3O4 for the reduction of U(VI) was 19.3 times higher than that of pure TiO2, which is strongly correlated with the Fe and additional Fe(II) generated from the reduction of Fe3O4 by TiO2 photoelectrons. The effects of initial uranium concentration, solution pH, ionic strength, the composition of wastewater, and organic pollutants on the U(VI) removal by TiO2/Fe3O4 were systematically investigated. The results demonstrated its excellent performance in the cleanup of uranium contamination. As graphene can efficiently attract the TiO2 photoelectrons and thus decrease their transfer to Fe3O4, the photodissolution of Fe3O4 in the TiO2/graphene/Fe3O4 composite can be largely alleviated compared to that of the TiO2/Fe3O4, rendering this ternary composite a much higher stability. In addition, scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray absorption near edge spectroscopy (XANES), and X-ray photoelectron spectroscopy (XPS) were used to explore. the reaction mechanisms.