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<p>Type-II SrTiO₃/PPy composites were successfully fabricated via in-situ oxidative polymerization to enhance the photocatalytic degradation efficiency of Rhodamine B (RhB). The composite design synergistically combined SrTiO₃ nanoparticles (synthesized with optimized VEG/VH₂O ratios) and polypyrrole (PPy), forming a core-shell architecture confirmed by XRD, TEM, and XPS analyses. Systematic screening of surfactants and pyrrole concentrations revealed that the composite with 5.2% pyrrole and anionic surfactant SDS exhibited optimal performance, achieving 97.60% RhB degradation under UV irradiation within 90&#xa0;min. Bandgap analysis and radical trapping experiments demonstrated that the staggered Type-II heterojunction between SrTiO₃ and PPy facilitated efficient charge separation, while strong interfacial interactions promoted electron transfer from SrTiO₃ to PPy. This study elucidates the photocatalytic mechanism dominated by •O₂⁻ radicals and direct hole oxidation, providing a scalable strategy for designing high-performance photocatalysts through heterojunction engineering. The work highlights the critical role of surface chemistry and band alignment in environmental remediation applications.</p> Graphical Abstract <p></p>

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Preparation of SrTiO3/PPy Composites and Photocatalytic Degradation of RhB

  • 期刊论文

  • 发表日期：

    2025年8月4日

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  • Lili Li,
  • Jiaxin Li,
  • Wen Xi,
  • Jing Shu

摘要

Type-II SrTiO₃/PPy composites were successfully fabricated via in-situ oxidative polymerization to enhance the photocatalytic degradation efficiency of Rhodamine B (RhB). The composite design synergistically combined SrTiO₃ nanoparticles (synthesized with optimized VEG/VH₂O ratios) and polypyrrole (PPy), forming a core-shell architecture confirmed by XRD, TEM, and XPS analyses. Systematic screening of surfactants and pyrrole concentrations revealed that the composite with 5.2% pyrrole and anionic surfactant SDS exhibited optimal performance, achieving 97.60% RhB degradation under UV irradiation within 90 min. Bandgap analysis and radical trapping experiments demonstrated that the staggered Type-II heterojunction between SrTiO₃ and PPy facilitated efficient charge separation, while strong interfacial interactions promoted electron transfer from SrTiO₃ to PPy. This study elucidates the photocatalytic mechanism dominated by •O₂⁻ radicals and direct hole oxidation, providing a scalable strategy for designing high-performance photocatalysts through heterojunction engineering. The work highlights the critical role of surface chemistry and band alignment in environmental remediation applications.

Graphical Abstract