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<p>In recent years, piezoelectric–photocatalytic materials have attracted significant attention due to their potential to address environmental pollution issues in a straightforward, effective and sustainable manner. In this paper, Ag nanoparticles are successfully immobilized on the surface of ZnO, and a multifunctional PVDF-based water treatment membrane with piezoelectric–photocatalytic performance is constructed for the first time by combining the prepared ZnO@PDA-Ag composite nano-photocatalysts with the PVDF-g-IL piezoelectric matrix. The distinctive structure of ZnO@PDA-Ag enhances charge separation in the photocatalytic process, effectively promoting the photocatalytic activity of ZnO. The grafting IL onto PVDF chain segments induces a transformation of the polar crystalline phases within the PVDF. The synergistic effect of both results in significant improvements to the membrane’s porosity, increasing the permeate flux. The PVDF-g-IL/ZnO@PDA-Ag membrane demonstrates a high degree of efficiency in the removal of various dyes with an approximate removal efficiency of 100%. Furthermore, the PVDF-g-IL/ZnO@PDA-Ag membrane displays piezoelectric polarization, resulting in the formation of a built-in electric field when exposed to ultrasound, which enhances electron–hole separation and transfer efficiency. The membrane is capable of degrading approximately 98% of the dye within a 90-min degradation experiment. Finally, the PVDF-g-IL/ZnO@PDA-Ag membrane exhibits excellent mechanical stability even after multiple self-cleaning and recycling cycles.</p>

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Piezoelectric photocatalytic PVDF-g-IL nanocomposite membranes incorporated with ZnO@PDA-Ag nanoparticles for high-efficiency dye wastewater separation and purification

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Hongxu Liu,
  • Junhao Xie,
  • Shulin Sun

摘要

In recent years, piezoelectric–photocatalytic materials have attracted significant attention due to their potential to address environmental pollution issues in a straightforward, effective and sustainable manner. In this paper, Ag nanoparticles are successfully immobilized on the surface of ZnO, and a multifunctional PVDF-based water treatment membrane with piezoelectric–photocatalytic performance is constructed for the first time by combining the prepared ZnO@PDA-Ag composite nano-photocatalysts with the PVDF-g-IL piezoelectric matrix. The distinctive structure of ZnO@PDA-Ag enhances charge separation in the photocatalytic process, effectively promoting the photocatalytic activity of ZnO. The grafting IL onto PVDF chain segments induces a transformation of the polar crystalline phases within the PVDF. The synergistic effect of both results in significant improvements to the membrane’s porosity, increasing the permeate flux. The PVDF-g-IL/ZnO@PDA-Ag membrane demonstrates a high degree of efficiency in the removal of various dyes with an approximate removal efficiency of 100%. Furthermore, the PVDF-g-IL/ZnO@PDA-Ag membrane displays piezoelectric polarization, resulting in the formation of a built-in electric field when exposed to ultrasound, which enhances electron–hole separation and transfer efficiency. The membrane is capable of degrading approximately 98% of the dye within a 90-min degradation experiment. Finally, the PVDF-g-IL/ZnO@PDA-Ag membrane exhibits excellent mechanical stability even after multiple self-cleaning and recycling cycles.