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<p>The CeO<sub>2</sub>/AgI/PPy ternary composite was synthesized via in situ polymerization using preformed CeO<sub>2</sub>/AgI as a structural template. The material’s crystalline structure, surface properties, and photoactivity were systematically characterized. Photocatalytic tests indicated that the CeO<sub>2</sub>/AgI/PPy composite exhibited exceptional visible-light-driven activity for Rhodamine B (RhB) degradation. It achieved a remarkable removal efficiency of 98.3% within 40&#xa0;min, which significantly outperformed pure PPy and the CeO<sub>2</sub>/AgI nanocomposite. Kinetic analysis revealed that its apparent rate constant reached 0.0996&#xa0;min<sup>−1</sup>, approximately 2.6 times higher than that of the CeO<sub>2</sub>/AgI composite. Moreover, after five consecutive cycles of recycling experiments, the composite retained 85% of its initial degradation efficiency, indicating excellent stability. Finally, mechanistic analysis revealed the synergistic effects of enhanced charge separation and interfacial electron transfer within the ternary system. This study deepens the fundamental understanding of interfacial charge dynamics in multicomponent photocatalysts while offering practical guidelines for engineering high-performance photocatalytic systems. The developed composite demonstrates strong potential for scalable implementation.</p>

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PPy composited CeO2/AgI photocatalyst for the degradation of organic dye and its unique charge transfer process

  • 期刊论文

  • 发表日期：

    2025年10月1日

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

摘要

The CeO2/AgI/PPy ternary composite was synthesized via in situ polymerization using preformed CeO2/AgI as a structural template. The material’s crystalline structure, surface properties, and photoactivity were systematically characterized. Photocatalytic tests indicated that the CeO2/AgI/PPy composite exhibited exceptional visible-light-driven activity for Rhodamine B (RhB) degradation. It achieved a remarkable removal efficiency of 98.3% within 40 min, which significantly outperformed pure PPy and the CeO2/AgI nanocomposite. Kinetic analysis revealed that its apparent rate constant reached 0.0996 min−1, approximately 2.6 times higher than that of the CeO2/AgI composite. Moreover, after five consecutive cycles of recycling experiments, the composite retained 85% of its initial degradation efficiency, indicating excellent stability. Finally, mechanistic analysis revealed the synergistic effects of enhanced charge separation and interfacial electron transfer within the ternary system. This study deepens the fundamental understanding of interfacial charge dynamics in multicomponent photocatalysts while offering practical guidelines for engineering high-performance photocatalytic systems. The developed composite demonstrates strong potential for scalable implementation.