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<p>Volatile organic compounds (VOCs), particularly isopropanol (IPA), are extensively emitted from semiconductor and pharmaceutical industries and pose substantial threats to human health and atmospheric quality. Conventional adsorption and catalytic methods often face limitations such as high energy consumption, limited efficiency, and short service life, underscoring the urgent need for sustainable and multifunctional materials. In this study, a sulfidated zero-valent iron–biochar composite (S-nZVI/BC) was engineered and systematically optimized via response surface methodology (RSM) to simultaneously enhance adsorption and electrochemical performance for bioelectro-Fenton (BEF) systems. The optimized composite (Na₂S₂O₃-to-FeSO₄ molar ratio 0.18; chitosan/PVA ratio 2&#xa0;g/g) exhibited a high iodine adsorption capacity (478&#xa0;mg/g), superior hydrophilicity (contact angle 15°), and nearly complete removal of IPA (99.4%). Electrochemical characterization revealed a near two-electron oxygen reduction pathway (n = 2.14) with 90.8% H₂O₂ selectivity, highlighting its strong catalytic potential. Compared with conventional adsorbents, the optimized S-nZVI/BC material integrates VOC adsorption and catalytic functionalities, demonstrating promise as a sustainable platform for industrial VOC mitigation and energy-efficient advanced oxidation processes.</p> Graphical Abstract <p></p>

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Engineering S-nZVI/BC Composites with Enhanced Isopropanol Adsorption and Oxygen Reduction Activity for Sustainable VOC Control

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • Shu-Hui Liu,
  • Tsai-Ting Liu,
  • Chi-Wen Lin,
  • Chung-Yen Yeh

摘要

Volatile organic compounds (VOCs), particularly isopropanol (IPA), are extensively emitted from semiconductor and pharmaceutical industries and pose substantial threats to human health and atmospheric quality. Conventional adsorption and catalytic methods often face limitations such as high energy consumption, limited efficiency, and short service life, underscoring the urgent need for sustainable and multifunctional materials. In this study, a sulfidated zero-valent iron–biochar composite (S-nZVI/BC) was engineered and systematically optimized via response surface methodology (RSM) to simultaneously enhance adsorption and electrochemical performance for bioelectro-Fenton (BEF) systems. The optimized composite (Na₂S₂O₃-to-FeSO₄ molar ratio 0.18; chitosan/PVA ratio 2 g/g) exhibited a high iodine adsorption capacity (478 mg/g), superior hydrophilicity (contact angle 15°), and nearly complete removal of IPA (99.4%). Electrochemical characterization revealed a near two-electron oxygen reduction pathway (n = 2.14) with 90.8% H₂O₂ selectivity, highlighting its strong catalytic potential. Compared with conventional adsorbents, the optimized S-nZVI/BC material integrates VOC adsorption and catalytic functionalities, demonstrating promise as a sustainable platform for industrial VOC mitigation and energy-efficient advanced oxidation processes.

Graphical Abstract