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Supported Atomically-Precise Gold Nanoclusters for Enhanced Flow-through Electro-Fenton.

Fuqiang Liu¹, Yanbiao Liu^1,2, Qiaofeng Yao³

¹Textile Pollution Controlling Engineering Center of Ministry of Environmental Protection, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.

Environmental Science & Technology

|April 10, 2020

Summary

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Atomically precise gold nanoclusters on carbon nanotube filters efficiently catalyze the electro-Fenton process for antibiotic degradation. This novel system enables in situ hydrogen peroxide production and decomposition, offering enhanced catalytic activity.

Area of Science:

Materials Science
Electrochemistry
Environmental Chemistry

Background:

Gold nanoparticles are increasingly recognized for catalyzing the Haber-Weiss cycle.
The Haber-Weiss cycle is crucial for generating hydroxyl radicals (HO·) for oxidation processes.

Purpose of the Study:

To design and demonstrate a flow-through electro-Fenton system using gold nanoclusters (AuNCs) on carbon nanotube (CNT) filters.
To evaluate the system's efficacy in degrading tetracycline antibiotics.

Main Methods:

Fabrication of CNT filters functionalized with atomically precise AuNCs.
Utilizing the filter in a flow-through electro-Fenton setup for in situ hydrogen peroxide (H₂O₂) production and decomposition.
Investigating the catalytic mechanism via density functional theory (DFT) calculations.

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Main Results:

The AuNC-functionalized CNT filter effectively catalyzed H₂O₂ decomposition to HO·.
Atomically precise AuNCs exhibited superior catalytic activity compared to larger gold nanoparticles.
The flow-through design enhanced mass transport, outperforming conventional batch reactors.

Conclusions:

The developed electro-Fenton system demonstrates high efficiency for antibiotic degradation.
AuNCs act as effective Fenton catalysts through Au⁺/Au⁰ redox cycling.
DFT calculations provided atomic-level insights into the gold-mediated Fenton reaction mechanism.