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2025-01-11

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cc-by (c) Zhao, Lele et al., 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231716

Complete antihistamine degradation in wastewater matrix using a metal-free N-doped carbon with superior electrocatalytic performance for in-situ $$H_2O_2$ production

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https://doi.org/10.1016/j.seppur.2025.131590

Resum

A new gas-diffusion electrode (GDE) has been developed and optimized to apply the heterogeneous electro-Fenton (EF) process to the degradation of the antihistamine diphenhydramine. The complete removal of this hazardous drug pollutant was achieved within only 120 min in actual urban wastewater at pH 5.9. Nitrogendoped carbon electrocatalysts were first synthesized by direct pyrolysis of blends of commercial Vulcan carbon and melamine as nitrogen dopant. A radar chart was proposed to correlate the tested physicochemical and electrochemical properties. A well-balanced surface area, mesopores volume and defective carbon content were critical to ensure the highest activity (Eonset = 0.38 V vs. RHE) and selectivity (n ~ 2, yH2O2 ~ 95.3%) for twoelectron oxygen reduction reaction (ORR), which allowed the efficient in-situ production of H2O2 as •OH precursor. N-doping (10.5 wt%), along with the presence of pyrrolic N (3.5%), are also key factors to explain the enhancement. GDEs fabricated with the optimal electrocatalyst (71.4 wt% melamine content) were capable of accumulating up to ~35 mM H2O2 within 5 h, outperforming the commercial GDEs. This work evidences theinterplay of physicochemical and electrocatalytic parameters in H2O2-based advanced water treatment, demonstrating that it is possible to envisage a more efficient and greener tertiary wastewater treatment.

Matèries

Reacció d'oxidació-reducció, Contaminants orgànics de l'aigua

Matèries (anglès)

Oxidation-reduction reaction, Organic water pollutants

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

ZHAO, Lele, et al. Complete antihistamine degradation in wastewater matrix using a metal-free N-doped carbon with superior electrocatalytic performance for in-situ $$H_2O_2$ production. Separation and Purification Technology. 2025. Vol. 361. ISSN 1383-5866. [consulted: 26 of September of 2026]. Available at: https://hdl.handle.net/2445/231716

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