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<p>To address dye wastewater pollution and the visible-light limitations of TiO<sub>2</sub> photocatalysts, this study develops a highly active and easily recoverable “polymer-photocatalyst-polymer” sandwich nanofiber membrane (NFM). Initially, a CuWO<sub>4</sub>/ TiO<sub>2</sub> (CT) heterojunction is synthesized via a sol-gel method, successfully narrowing the bandgap from 3.2&#xa0;eV to 2.53&#xa0;eV. This is then integrated with coconut shell biochar (CSB) to form a CT/C composite, where CSB acts as an electron sink to enhance charge separation and dye adsorption. To overcome the recovery challenges of powdered catalysts, the optimized CT/C composite is immobilized within Nylon 6,6 utilizing electrospinning and electrospraying techniques. Removal evaluations demonstrate that the optimized composite membrane achieves a 95% removal rate of methylene blue (MB) within 150&#xa0;min under visible light. Furthermore, the NFM exhibits excellent reusability, maintaining a removal rate of over 92% after three consecutive cycles, providing an efficient and sustainable solution for wastewater remediation.</p>

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Development of electrospun fibrous membranes with visible light-responsive CuWO4/TiO2/Coconut shell biochar photocatalyst

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Yu-Hsun Nien,
  • Xin-Yu Su

摘要

To address dye wastewater pollution and the visible-light limitations of TiO2 photocatalysts, this study develops a highly active and easily recoverable “polymer-photocatalyst-polymer” sandwich nanofiber membrane (NFM). Initially, a CuWO4/ TiO2 (CT) heterojunction is synthesized via a sol-gel method, successfully narrowing the bandgap from 3.2 eV to 2.53 eV. This is then integrated with coconut shell biochar (CSB) to form a CT/C composite, where CSB acts as an electron sink to enhance charge separation and dye adsorption. To overcome the recovery challenges of powdered catalysts, the optimized CT/C composite is immobilized within Nylon 6,6 utilizing electrospinning and electrospraying techniques. Removal evaluations demonstrate that the optimized composite membrane achieves a 95% removal rate of methylene blue (MB) within 150 min under visible light. Furthermore, the NFM exhibits excellent reusability, maintaining a removal rate of over 92% after three consecutive cycles, providing an efficient and sustainable solution for wastewater remediation.