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<p>The escalating environmental challenges posed by organic dye pollution necessitate the development of efficient and sustainable remediation technologies. This study presents a novel strategy to enhance the visible-light photocatalytic performance of TiO<sub>2</sub> through the synthesis of hyperbranched polyglycerol (HPG)-modified nanocomposites functionalized with photosensitizers (hemin and Eosin Y (EY)). A sol-gel method was employed to graft HPG with tailored polymerization degrees and branching architectures onto TiO<sub>2</sub> surfaces, enabling systematic investigation of the effects of modifier content, polymer structure, and light source on photocatalytic activity. The grafted polymers significantly narrowed TiO<sub>2</sub>’s bandgap energy (from 2.82&#xa0;eV for pure TiO<sub>2</sub> to as low as 0.73&#xa0;eV for HPG2-hemin/TiO<sub>2</sub>), extending its light absorption to the visible spectrum. Under optimized conditions, 1% HPG5-EY/TiO<sub>2</sub> achieved a methylene blue (MB) degradation rate of 73.22% within 120&#xa0;min of visible-light irradiation—a 2.11-fold enhancement compared to pristine TiO<sub>2</sub>. The composite also demonstrated exceptional recyclability, retaining over 95% of its initial activity after four recycling cycles. The catalyst has exhibited excellent degradation performance in visible light compared to most of the recently reported systems. Mechanistic studies revealed that the abundant hydroxyl groups in HPG facilitated the generation of reactive oxygen species (•OH and •O<sub>2</sub><sup>−</sup>), which synergistically accelerated MB degradation. This work establishes a robust framework for designing high-performance TiO<sub>2</sub>-based photocatalysts by leveraging polymer structural engineering and photosensitizer integration. The approach not only addresses the inherent limitations of TiO<sub>2</sub>’s UV-dependent activity but also provides a scalable strategy for sustainable wastewater treatment under solar illumination.</p>

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Synthesis of Hyperbranched Polyglycerol-Photosensitizer/TiO2 Nanocomposite for the Photocatalytic Degradation of Methylene Blue

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Guang-Zhao Li,
  • Shengrong Zhou,
  • Debin Tian,
  • Chengqiang Yang,
  • Dong Fang,
  • Gen Liu,
  • Wenyan Wang,
  • Jinyu Zhou,
  • Rui Han

摘要

The escalating environmental challenges posed by organic dye pollution necessitate the development of efficient and sustainable remediation technologies. This study presents a novel strategy to enhance the visible-light photocatalytic performance of TiO2 through the synthesis of hyperbranched polyglycerol (HPG)-modified nanocomposites functionalized with photosensitizers (hemin and Eosin Y (EY)). A sol-gel method was employed to graft HPG with tailored polymerization degrees and branching architectures onto TiO2 surfaces, enabling systematic investigation of the effects of modifier content, polymer structure, and light source on photocatalytic activity. The grafted polymers significantly narrowed TiO2’s bandgap energy (from 2.82 eV for pure TiO2 to as low as 0.73 eV for HPG2-hemin/TiO2), extending its light absorption to the visible spectrum. Under optimized conditions, 1% HPG5-EY/TiO2 achieved a methylene blue (MB) degradation rate of 73.22% within 120 min of visible-light irradiation—a 2.11-fold enhancement compared to pristine TiO2. The composite also demonstrated exceptional recyclability, retaining over 95% of its initial activity after four recycling cycles. The catalyst has exhibited excellent degradation performance in visible light compared to most of the recently reported systems. Mechanistic studies revealed that the abundant hydroxyl groups in HPG facilitated the generation of reactive oxygen species (•OH and •O2−), which synergistically accelerated MB degradation. This work establishes a robust framework for designing high-performance TiO2-based photocatalysts by leveraging polymer structural engineering and photosensitizer integration. The approach not only addresses the inherent limitations of TiO2’s UV-dependent activity but also provides a scalable strategy for sustainable wastewater treatment under solar illumination.