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<p>The widespread use of antibiotics has led to the presence of persistent pharmaceutical pollutants such as sulfamethoxazole in aquatic environments and wastewater. Traditional wastewater treatment technologies are insufficient to remove these compounds effectively. This study aimed to evaluate an electro-Fenton system using a graphite felt cathode modified with carbon and polytetrafluoroethylene for sulfamethoxazole removal from water. The surface loading of 1.5&#xa0;mg cm⁻² of carbon black enhanced the electroactive area and achieved the highest specific hydrogen peroxide generation yield (0.22 mM mg<sup>− 1</sup>) at − 0.9&#xa0;V vs. Ag|AgCl after 30&#xa0;min. The polytetrafluoroethylene layer on the other hand, provided hydrophobicity and buoyancy, facilitating access to atmospheric oxygen without external bubbling. The modified floating cathode achieved 99% methylene blue decolorization in 20&#xa0;min and 91% of sulfamethoxazole degradation in 180&#xa0;min, adjusting to a pseudo-first-order kinetic model with a degradation rate constant of 0.0125&#xa0;min⁻¹. These results highlight the potential of this cathodic configuration as an efficient, sustainable, and scalable platform for the electrochemical treatment of emerging contaminants in wastewater.</p> Graphical Abstract <p></p>

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Graphite felt cathodes modified with carbon black and PTFE for the efficient electro-Fenton degradation of sulfamethoxazole

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • Sebastián Mori-Huerta,
  • María L. Salazar-López,
  • Josué D. García-Espinoza,
  • Irma Robles,
  • Francisco J. Rodríguez-Valadez,
  • Diana I. Sandoval-Cárdenas,
  • Luis A. Godínez

摘要

The widespread use of antibiotics has led to the presence of persistent pharmaceutical pollutants such as sulfamethoxazole in aquatic environments and wastewater. Traditional wastewater treatment technologies are insufficient to remove these compounds effectively. This study aimed to evaluate an electro-Fenton system using a graphite felt cathode modified with carbon and polytetrafluoroethylene for sulfamethoxazole removal from water. The surface loading of 1.5 mg cm⁻² of carbon black enhanced the electroactive area and achieved the highest specific hydrogen peroxide generation yield (0.22 mM mg− 1) at − 0.9 V vs. Ag|AgCl after 30 min. The polytetrafluoroethylene layer on the other hand, provided hydrophobicity and buoyancy, facilitating access to atmospheric oxygen without external bubbling. The modified floating cathode achieved 99% methylene blue decolorization in 20 min and 91% of sulfamethoxazole degradation in 180 min, adjusting to a pseudo-first-order kinetic model with a degradation rate constant of 0.0125 min⁻¹. These results highlight the potential of this cathodic configuration as an efficient, sustainable, and scalable platform for the electrochemical treatment of emerging contaminants in wastewater.

Graphical Abstract