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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Highly active and durable carbon electrocatalyst for nitrate reduction reaction.

Weijian Duan1, Ge Li1, Zhenchao Lei1

  • 1The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, PR China.

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A novel N-doped carbon-encapsulated iron nanoparticle catalyst (Fe@N-C) shows high activity and stability for the nitrate reduction reaction (NRR). This durable electrocatalyst effectively removes nitrate from industrial wastewater.

Keywords:
Coking wastewaterElectrochemical nitrate reductionIndustrial wastewater treatmentNitrogen selectivityPorous carbon-encapsulated iron nanoparticles

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Environmental Science

Background:

  • Metallic electrocatalysts for nitrate reduction reaction (NRR) suffer from poor stability due to leaching and oxidation.
  • Developing stable and active electrocatalysts is crucial for efficient nitrate removal.

Purpose of the Study:

  • To develop a novel, stable, and highly active electrocatalyst for NRR.
  • To investigate the performance of N-doped graphitic carbon-encapsulated iron nanoparticles (Fe@N-C) for nitrate reduction.

Main Methods:

  • Synthesis of N-doped graphitic carbon-encapsulated iron nanoparticles (Fe@N-C).
  • Electrochemical testing of Fe@N-C for NRR, including activity, selectivity, and durability assessments.
  • Analysis of nitrate removal efficiency in synthetic and real industrial wastewater.

Main Results:

  • Fe@N-C achieved 83.0% nitrate removal in the first cycle, outperforming reference catalysts.
  • Nitrogen selectivity reached 100% with the addition of NaCl.
  • The Fe@N-C cathode demonstrated excellent stability over 20 cycles with no significant loss in removal percentage.
  • Efficient nitrate removal was observed in real coking wastewater effluent.

Conclusions:

  • Fe@N-C is a highly active and durable electrocatalyst for NRR.
  • The graphitic shell protects iron nanoparticles from degradation, enhancing catalyst stability.
  • This catalyst shows significant potential for practical applications in industrial wastewater treatment.