共 71 条
Fe/Fe3C nanoparticle-decorated N-doped carbon nanofibers for improving the nitrogen selectivity of electrocatalytic nitrate reduction
被引:115
作者:
Lan, Yue
[1
]
Chen, Junliang
[1
]
Zhang, Hui
[1
]
Zhang, Wei-xian
[2
]
Yang, Jianping
[1
]
机构:
[1] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China
[2] Tongli Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China
基金:
中国国家自然科学基金;
关键词:
EFFICIENT BIFUNCTIONAL CATALYST;
PRUSSIAN BLUE;
OXYGEN REDUCTION;
ELECTROCHEMICAL REDUCTION;
ELECTRODE MATERIALS;
WASTE-WATER;
DENITRIFICATION;
NANOTUBES;
COMPOSITE;
REMOVAL;
D O I:
10.1039/d0ta02317e
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Nanoscale zero-valent iron has been considered to be the most promising electrocatalyst for denitrification due to its abundant resources, low price and non-toxicity. Nevertheless, the low utilization of active ingredients, inferior removal capacities (mg N g(-1)Fe), and poor nitrogen selectivity are still major challenges during practical nitrate reduction. Herein, we have synthesized a one-dimensional architecture with homogeneously distributed Fe/Fe3C nanoparticles immobilized in a monodispersed carbonaceous matrix, embedded in ultra-high N-doped carbon nanofibers (Fe/Fe3C-NCNF)viaa simple electrospinning strategy followed by confined reduction under a H(2)atmosphere. The as-prepared Fe/Fe3C-NCNF nanostructure features well-dispersed Fe/Fe3C nanoparticles, confined reactive spaces, an interconnected nanofiber framework, and rich nitrogen doping sites, which are beneficial for integrating the synergistic catalytic effect of Fe and Fe3C, providing high-reactivity sites, boosting electron transfer, enlarging the catalyst-electrolyte interface and enhancing the surface adsorption capacity. The results reveal ultra-high nitrogen selectivity of 95% within 6 h and nearly 100% in 12 h, which are superior to other reported catalysts, and a maximum removal capacity of 2928.42 mg N g(-1)Fe can be achieved, greatly improving the utilization of active ingredients. In addition, the catalysis material also shows good catalysis stability due to its structural features. The results of this study provide broad potential for the further development of iron-based functional nanostructures for electrocatalytic denitrification.
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页码:15853 / 15863
页数:11
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