Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 310, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121291
Keywords
Nitrate reduction; Hydrogen sulfide oxidation; Nitrogen doping; Carbon nanotube; Iron carbide
Funding
- Taishan Scholar Project of Shandong Province [tsqn201812083]
- Natural Science Foundation of Shandong Province [ZR2019YQ20, ZR2021JQ15]
- Innovative Team Project of Jinan [2021GXRC019]
- National Natural Science Foundation of China [51972147, 52022037]
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In this study, a highly efficient electrocatalytic method for upgrading nitrate and hydrogen sulfide to ammonia and sulfur in wastewater was reported. The nitrogen-doped carbon nanotubes encapsulated iron carbide array electrode showed high catalytic activity and excellent yield rates for both ammonia and sulfur. The electrode also demonstrated great stability for practical application.
To achieve the efficient electrocatalytic upgrading of nitrate (NO3-) and hydrogen sulfide (H2S) to value-added ammonia (NH3) and sulfur (S) from wastewater, herein, we report a remarkable nitrogen-doped carbon nano tubes encapsulated iron carbide array electrode (Fe3C@N-CNTs/IF) as both cathode and anode for the efficient electrocatalytic reduction of NO3- to NH3 and oxidation of H2SS to S, respectively. Both experimental and theoretical calculation confirm the high activity of Fe3C@N-CNTs/IF. A maximal NH3 faradaic efficiency of similar to 97.9% with the yield rate of 0.922 mg h(-1) cm(-2) at 1.1 V vs. SCE and the S yield rate of 33.76 mg h(-1) cm(-2) at the current density of 100 mA cm(-2) can be achieved. In addition, a flow cell is employed with a multifunctional Fe3C@N-CNTs/IF electrode with channels made by laser to maintains excellent stability for continuous upcycling NO3- and H2S to produce NH3 and S, which demonstrates its massive potential for practical application.
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