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<p>Contact-electro-catalysis (CEC) utilizing liquid-solid contact electrification (LS-CE) has demonstrated significant potential for degrading organic pollutants without external electrical bias. While particle-based dielectric materials have shown high catalytic activity, their practical application often necessitates additional post-treatment filtration to recover the catalysts and ensure treated water quality. To streamline this process and enhance operational usability, we developed a filtration-free electrospun SiO₂-PVDF nanofibrous mat (NF-mat). By immobilizing the active SiO₂ and PVDF components within a robust fibrous matrix, this approach effectively circumvents the need for complex recovery steps. Under ultrasonic excitation, the NF-mat provides a hierarchically porous architecture with a high specific surface area (41.6m²/g), creating an optimal environment for liquid-solid electron transfer and Reactive Oxygen Species (ROS) generation. Consequently, the NF-mat achieved efficient decolorization of both cationic methylene blue (MB, 99.5% within 4h) and anionic methyl orange (MO, 98.1% within 8h). Although MB removal involved a concurrent adsorption contribution, adsorption alone could not account for the near-complete decolorization, and the removal of both MB and MO was predominantly governed by CEC. Furthermore, the mat exhibited excellent mechanical stability and recyclability over multiple cycles without structural disintegration. This study proposes a user-friendly and sustainable platform for CEC-based water treatment, offering a viable solution for continuous environmental remediation.</p>

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Toward Filtration-free Contact-electro-catalysis: A robust and recyclable electrospun SiO2–PVDF Nanofibrous mat for decolorization of organic dyes

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月29日

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  • Muhammad Awais,
  • Sunmin Jang,
  • Donghan Lee,
  • Sumin Cho,
  • Sangeun Lee,
  • Soban Ali Shah,
  • Muhammad Ramzan Khawar,
  • Kangmin Yun,
  • Dongik Kam,
  • Juyeong Kim,
  • Hee Jae Hwang,
  • Sung Jea Park,
  • Dongwhi Choi

摘要

Contact-electro-catalysis (CEC) utilizing liquid-solid contact electrification (LS-CE) has demonstrated significant potential for degrading organic pollutants without external electrical bias. While particle-based dielectric materials have shown high catalytic activity, their practical application often necessitates additional post-treatment filtration to recover the catalysts and ensure treated water quality. To streamline this process and enhance operational usability, we developed a filtration-free electrospun SiO₂-PVDF nanofibrous mat (NF-mat). By immobilizing the active SiO₂ and PVDF components within a robust fibrous matrix, this approach effectively circumvents the need for complex recovery steps. Under ultrasonic excitation, the NF-mat provides a hierarchically porous architecture with a high specific surface area (41.6m²/g), creating an optimal environment for liquid-solid electron transfer and Reactive Oxygen Species (ROS) generation. Consequently, the NF-mat achieved efficient decolorization of both cationic methylene blue (MB, 99.5% within 4h) and anionic methyl orange (MO, 98.1% within 8h). Although MB removal involved a concurrent adsorption contribution, adsorption alone could not account for the near-complete decolorization, and the removal of both MB and MO was predominantly governed by CEC. Furthermore, the mat exhibited excellent mechanical stability and recyclability over multiple cycles without structural disintegration. This study proposes a user-friendly and sustainable platform for CEC-based water treatment, offering a viable solution for continuous environmental remediation.