Loading Actinides in Multilayered Structures for Nuclear Waste Treatment: The First Case Study of Uranium Capture with Vanadium Carbide MXene

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• 作者：Lin Wang ; Liyong Yuan ; Ke Chen ; Yujuan Zhang ; Qihuang Deng ; Shiyu Du ; Qing Huang ; Lirong Zheng ; Jing Zhang ; Zhifang Chai ; Michel W. Barsoum ; Xiangke Wang ; Weiqun Shi
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：June 29, 2016
• 年：2016
• 卷：8
• 期：25
• 页码：16396-16403
• 全文大小：541K
• 年卷期：0
• ISSN：1944-8252

文摘

Efficient nuclear waste treatment and environmental management are important hurdles that need to be overcome if nuclear energy is to become more widely used. Herein, we demonstrate the first case of using two-dimensional (2D) multilayered V₂CT_x nanosheets prepared by HF etching of V₂AlC to remove actinides from aqueous solutions. The V₂CT_x material is found to be a highly efficient uranium (U(VI)) sorbent, evidenced by a high uptake capacity of 174 mg g^–1, fast sorption kinetics, and desirable selectivity. Fitting of the sorption isotherm indicated that the sorption followed a heterogeneous adsorption model, most probably due to the presence of heterogeneous adsorption sites. Density functional theory calculations, in combination with X-ray absorption fine structure characterizations, suggest that the uranyl ions prefer to coordinate with hydroxyl groups bonded to the V-sites of the nanosheets via forming bidentate inner-sphere complexes.