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Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
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Dual Source Electron Transfer Enabled by N-Doped Carbon for Efficient Fe(III) Reduction.

Zhengwei Zhou1, Guojie Ye1, Chengsi Hou1

  • 1State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering, Key Laboratory of Urban Water Supply, Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources, Shanghai Institute of Pollution Control and Ecological Security, Tongji University, Shanghai 200092, China.

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Summary

This study introduces nitrogen-doped Ketjen Black (KB-N) for efficient Fenton-like water treatment. KB-N uses pollutants and H2O2 as electron donors, enabling clean and sustainable contaminant degradation.

Keywords:
Fe(III)/Fe(II) cyclingKetjen Blackdelocalized π-electronsdual electron shuttleguanine

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Area of Science:

  • Environmental Chemistry
  • Catalysis
  • Materials Science

Background:

  • The Fenton-like process relies on the Fe(III)/Fe(II) cycle for contaminant degradation.
  • Conventional methods using external reductants face challenges like radical self-quenching and pollution.

Purpose of the Study:

  • To develop an innovative Fenton-like process using electron-rich pollutants and H2O2 as dual electron donors.
  • To synthesize and characterize nitrogen-doped Ketjen Black (KB-N) for enhanced Fe(III) reduction.

Main Methods:

  • Synthesized KB-N via pyrolysis of guanine.
  • Investigated KB-N's role in mediating electron transfer from pollutants and H2O2 to Fe(III).
  • Analyzed the catalytic activity of pyridinic nitrogen sites in Fe(III) coordination and H2O2 activation.

Main Results:

  • KB-N facilitated dual-channel electron transfer, accelerating Fe(III) reduction and Fe(II) regeneration.
  • Pyridinic N sites in KB-N enhanced H2O2 activation by coordinating with Fe(III).
  • The method broadened electron supply sources, overcoming limitations of pristine Ketjen Black.

Conclusions:

  • KB-N enables a clean electron transfer mechanism for efficient and stable contaminant degradation.
  • This approach offers a sustainable alternative to sacrificial electron donor strategies in water treatment.
  • The study presents a novel pathway for highly efficient and sustainable water treatment technologies.