Enhanced Electrocatalytic Reduction of Nitrate on Two-Dimensional Bimetallic Cu/Fe Metal-Organic Frameworks

作     者：Ma, Qian Xue, Yinghao Zhang, Chuning Chen, Yanyan Teng, Wei Fan, Jianwei Zhang, Wei-Xian 

作者机构：State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Nitrates 

摘      要：Nitrate is a stable and persistent pollutant, which is difficult to remove by water self-purification once contaminated with excessive nitrate. The electrocatalytic reduction of nitrate to ammonia in wastewater has great practical significance and application prospects as the process can convert pollutants into useful industrial raw materials. Cu/Fe 2D bimetallic metal-organic frameworks were synthesized by a facile method applied as cathode materials. Bimetallic centers (Cu, Fe) with enhanced intrinsic activity demonstrated higher removal efficiency. Meanwhile, the 2D nanosheet reduced the mass transfer barrier between catalyst and nitrate and increased the reaction rate. Therefore, the catalysts with a 2D structure showed better removal efficiency in comparison with other structures (3D MOFs and Bulk MOFs). Under optimal conditions, the catalyst exhibited high nitrate removal efficiency (87.8%) and ammonium selectivity (89.3%). The ammonium yielded up to significantly 907.2 μg h -1 mg cat -1 with Faradaic efficiency of 62.8% at initial 100 mg L -1 NO 3 - -N. The catalyst was proved to have good stability and it was recycled 15 times with good effect. DFT simulations confirm the reduced Gibbs free energy of Cu/Fe-MOF. © 2022, The Authors. All rights reserved.