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<p>Enhancing the sustainability of catalysts is crucial for the practical application of piezo-photocatalytic degradation of sewage. This study introduces a novel approach by fabricating highly stretchable piezoelectric composite nanofiber films through electrospinning TPU/g-C<sub>3</sub>N<sub>4</sub> mixture. The tight integration of TPU nanofibers with g-C<sub>3</sub>N<sub>4</sub> few-layers pre-stresses g-C<sub>3</sub>N<sub>4</sub> and strengthens the mechanical properties of the composite films, achieving a maximum tensile strain and stress of 862% and 6.90 MPa, respectively. With the assistance of 300 W ultrasound, the photocatalytic capability of the TPU/0.2g g-C<sub>3</sub>N<sub>4</sub> composite nanofiber film is enhanced by 43% and maintains nearly 100% of its initial performance after 12 repeated experiments. The electronic, piezoelectric, and optical properties of uniaxial-strained monolayer g-C<sub>3</sub>N<sub>4</sub> are studied by first-principles calculations, revealing that stretching in the armchair direction can double the in-plane piezoelectric coefficient, while compression in the armchair direction simultaneously alters the charge distribution within the heptazine rings and modulates the adsorption sites and energy for oxygen molecule. Therefore, ultrasound-induced dynamic strains can significantly enhance the photocatalytic effect. The degradation of electronic industrial wastewater demonstrates the practical application potential of the catalytic composite nanofiber film. This research offers a pioneering strategy for the development of efficient photocatalytic systems for sewage treatment.</p>

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Highly stretchable TPU/g-C3N4 composite nanofiber film for enhancing the piezo-photocatalytic sewage treatment by electrospinning-induced pretension

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月18日

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  • Na Sun,
  • Zeqian Ren,
  • Peng Chen,
  • Miao Yue,
  • Jizhou Wu,
  • Yongming Fu,
  • Jie Ma

摘要

Enhancing the sustainability of catalysts is crucial for the practical application of piezo-photocatalytic degradation of sewage. This study introduces a novel approach by fabricating highly stretchable piezoelectric composite nanofiber films through electrospinning TPU/g-C3N4 mixture. The tight integration of TPU nanofibers with g-C3N4 few-layers pre-stresses g-C3N4 and strengthens the mechanical properties of the composite films, achieving a maximum tensile strain and stress of 862% and 6.90 MPa, respectively. With the assistance of 300 W ultrasound, the photocatalytic capability of the TPU/0.2g g-C3N4 composite nanofiber film is enhanced by 43% and maintains nearly 100% of its initial performance after 12 repeated experiments. The electronic, piezoelectric, and optical properties of uniaxial-strained monolayer g-C3N4 are studied by first-principles calculations, revealing that stretching in the armchair direction can double the in-plane piezoelectric coefficient, while compression in the armchair direction simultaneously alters the charge distribution within the heptazine rings and modulates the adsorption sites and energy for oxygen molecule. Therefore, ultrasound-induced dynamic strains can significantly enhance the photocatalytic effect. The degradation of electronic industrial wastewater demonstrates the practical application potential of the catalytic composite nanofiber film. This research offers a pioneering strategy for the development of efficient photocatalytic systems for sewage treatment.