Uranium Capture by a Layered 2d/2d Niobium Phosphate/Holey Graphene Architecture Via an Electro-Adsorption and Electrocatalytic Reduction Coupling Process

作     者：Liao, Yun Lei, Ruilin Weng, Xiaofang Yan, Chuan Fu, Jiaxi Wei, Guoxing Zhang, Chen Wang, Meng Wang, Hongqing 

作者机构：School of Chemistry and Chemical Engineering University of South China Hunan Hengyang421001 China Hunan Key Laboratory for the Design and Application of Actinide Complexes University of South China Hunan Hengyang421001 China School of Nuclear Science and Technology University of South China Hunan Hengyang421001 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Graphene 

摘      要：As an energy-efficient and eco-friendly technique, capacitive deionization (CDI) has shown great potential for uranium (U(VI)) capture recently. However, extracting U(VI) with high kinetics, capacity and selectivity remains a major challenge due to the current surface active sites-based material and co-existing ions in aqueous solution. Here we rationally designed a layered 2D/2D niobium phosphate/holey graphene (HGNbP) electrode material, and originally demonstrated its efficient uranium capture ability via an electro-adsorption and electrocatalytic reduction coupling process. The less-accumulative loose layered architecture, open polycrystalline construction of niobium phosphate with active phosphate sites, and rich in-plane nano-pores on conductive graphene nanosheets endowed HGNbP with fast charge/ion transport, high electroconductivity and superior pseudocapacitance, which enabled U(VI) ions first to be electro-adsorbed, then physico-chemical adsorbed, and finally electrocatalysis reduced/deposited onto electrode surface without the limitation of active sites under a low potential of 1.2V. Based on these virtues, the HGNbP exhibited a fast adsorption kinetics, with a high removal rate of 99.9% within 30min in 50 mg L -1 uranium solution, and a high adsorption capacity up to 1340 mg g -1 in 1000 mg L -1 uranium solution. Furthermore, the good recyclability and selectivity towards uranium were also realized. © 2022, The Authors. All rights reserved.