文献类型：期刊文献

英文题名：Electro-adsorption and reduction of Uranium(VI) by Fe3O4@COFs electrode with enhanced removal performance

作者：Yang, Sen[1];Ye, Zhouyi[1];Cheng, Xiaoya[1];Wang, Yuchun[2];Luan, Zitong[1];Li, Wenjun[1];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life & Environm Sci, Shaoxing 312000, Peoples R China;[2]Zhejiang Kunhe Environm Protect Technol Co Ltd, Shaoxing 312000, Peoples R China

年份：2023

卷号：474

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:001069353100001)、、EI(收录号：20233514660462)、Scopus(收录号：2-s2.0-85169041754)、WOS

基金：This work is supported by National Natural Science Foundation of China (22206131) .

语种：英文

外文关键词：Electro-adsorption; Reduction; Uranium(VI); COFs

外文摘要：Electro-adsorption is a promising technology for the removal of radionuclides, the development of electrodes is the key to achieve efficient separation. Herein, Fe3O4@COFs composites were obtained via one-step preparation strategy, and then loaded onto carbon felts to achieve efficient uranium(VI) electro-adsorption and reduction. The morphological and chemical structures of the prepared Fe3O4@COFs composites were confirmed by multiple analysis techniques. The results of adsorption experiments indicated that the adsorption equilibrium can be reached in half an hour at the potential of 1.2 V and 298.15 K. And the adsorption data for uranium(VI) is well consistent with pseudo-second-order kinetics model and Langmuir isotherm model with the maximum uptake capacity of 492.6 mg/g. Meanwhile, the functionalized electrode revealed good selectivity for uranium against other competing ions according to the calculated distribution coefficient Kd (3.24 x 104 mL/g). The simulated uranium-containing wastewater experiment results indicated the vast potential of Fe3O4@COFs electrodes for uranium(VI) removal from wastewaters. XPS studies confirmed that part of the hexavalent uranium(VI) is reduced to tetravalent uranium(IV) by Fe2+ in Fe3O4@COFs composites besides being bound by carboxyl ligands. This work can be extended to efficiently remove other charged pollutants by rational ligands design.