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216 results on '"Jia, Falong"'

18. Cu1−Fe Dual Sites for Superior Neutral Ammonia Electrosynthesis from Nitrate.

Author

Zhou, Biao, Yu, Linghao, Zhang, Weixing, Liu, Xupeng, Zhang, Hao, Cheng, Jundi, Chen, Ziyue, Li, Meiqi, Shi, Yanbiao, Jia, Falong, Huang, Yi, Zhang, Lizhi, and Ai, Zhihui

Subjects
DENITRIFICATION, ACTIVATION energy, ELECTROSYNTHESIS, ATOMIC hydrogen, NITRATES, ELECTROLYTIC reduction, COPPER, IRON oxides
Abstract

The electrochemical nitrate reduction reaction (NO3RR) is able to convert nitrate (NO3−) into reusable ammonia (NH3), offering a green treatment and resource utilization strategy of nitrate wastewater and ammonia synthesis. The conversion of NO3− to NH3 undergoes water dissociation to generate active hydrogen atoms and nitrogen‐containing intermediates hydrogenation tandemly. The two relay processes compete for the same active sites, especially under pH‐neutral condition, resulting in the suboptimal efficiency and selectivity in the electrosynthesis of NH3 from NO3−. Herein, we constructed a Cu1‐Fe dual‐site catalyst by anchoring Cu single atoms on amorphous iron oxide shell of nanoscale zero‐valent iron (nZVI) for the electrochemical NO3RR, achieving an impressive NO3− removal efficiency of 94.8 % and NH3 selectivity of 99.2 % under neutral pH and nitrate concentration of 50 mg L−1 NO3−−N conditions, greatly surpassing the performance of nZVI counterpart. This superior performance can be attributed to the synergistic effect of enhanced NO3− adsorption on Fe sites and strengthened water activation on single‐atom Cu sites, decreasing the energy barrier for the rate‐determining step of *NO‐to‐*NOH. This work develops a novel strategy of fabricating dual‐site catalysts to enhance the electrosynthesis of NH3 from NO3−, and presents an environmentally sustainable approach for neutral nitrate wastewater treatment. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Construction of an OCP-ATR-FTIR Spectroscopy Device to In SituMonitor the Interfacial Reaction of Contaminants: Competitive Adsorption of Cr(VI) and Oxalate on Hematite

Author

Cao, Shiyu, Chen, Na, Li, Meiqi, Wei, Kai, Zhan, Guangming, Guo, Furong, Gao, Tingjuan, Jia, Falong, and Zhang, Lizhi

Abstract

The comprehensive understanding of contaminant interfacial behavior strongly depends on the in situcharacterization technique, which is still a great challenge. In this study, we constructed a device integrated with open-circuit potentialand attenuated total reflectance Fourier transform infrared (OCP-ATR-FTIR) spectroscopy to simultaneously monitor the electrochemical and infrared spectral information on the interfacial reaction for the process analysis, taking the competitive adsorption of hexavalent chromium (Cr(VI)) and oxalate on hematite nanocubes (HNC) as an example. The synchronous OCP and infrared results revealed that Cr(VI) interacted with HNC via bidentate binuclear inner-sphere coordination, accompanied by electron transfer from HNC to Cr(VI), while oxalate was adsorbed on HNC through bidentate mononuclear side-on inner-sphere coordination with electron transfer from HNC to oxalate, and also outer-sphere coordination with negative charge accumulation. When oxalate was added to HNC with preadsorbed Cr(VI), oxalate would occupy the inner-sphere adsorption sites and thus cause the detaching of preadsorbed Cr(VI) from HNC. This study provides a promising in situcharacterization technique for real-time interfacial reaction monitoring and also sheds light on the competitive adsorption mechanism of oxalate and Cr(VI) on the mineral surface.

Published
2023
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