Dual Source Electron Transfer Enabled by N-Doped Carbon for Efficient Fe(III) Reduction.

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.