Coupling post-modification with reconstruction over Co-based metal–organic frameworks for electrochemical collective value-added recycling of nitrate and sulfion in wastewater
Literature Information
Tianlun Ren, Huizhen Wang, Shan Xu, Hongjie Yu, Kai Deng, Ziqiang Wang, Hongjing Wang, Liang Wang, You Xu
Integrating electrochemical nitrate reduction to ammonia (NRA) and the sulfion oxidation reaction (SOR) to construct a coupled electrolysis system is expected to realize the collective value-added recycling of nitrate and sulfion wastes. In this study, we developed a dimethylamineborane (DMAB)-involved post-modification strategy to convert pre-synthesized Co-MOF/NF into DMAB–Co-MOF/NF, which could serve as a bifunctional precatalyst and in situ reconstructed into heterogeneous CoOOH/Co(OH)2/NF (for NRA) and amorphous B–Co–S/NF (for SOR) as active phases under electrocatalytic conditions, respectively. With demonstrated excellent nitrate-to-ammonia activity over the reconstructed CoOOH/Co(OH)2/NF (NH3 yield rate: 0.238 mmol h−1 cm−2 and NH3 faradaic efficiency: 94.16%) and enhanced sulfion recycling capability over the reconstructed B–Co–S/NF (100 mA cm−2 of the SOR@0.268 V vs. the reversible hydrogen electrode), coupling NRA to the SOR based on these two electrocatalysts could realize energy-efficient collective value-added recycling of nitrate and sulfion into ammonia and sulfur (50 mA cm−2@1.062 V cell voltage).
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