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<p>In this study, spherical Br-Cu<sub>2</sub>O was successfully synthesized by a one-step hydrothermal method, and AgI@Br-Cu<sub>2</sub>O composite photocatalysts were prepared by loading AgI nanoparticles on them using liquid-phase deposition. The catalysts were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and electrochemical impedance spectroscopy (EIS) for their microscopic morphology and photoelectronic properties. The results showed that Br doping reduced the bandgap of Cu<sub>2</sub>O, enhanced the visible light absorption, and improved the photocatalytic performance by promoting the formation of oxygen vacancies. Under the optimal composite ratio, 10% AgI@20% Br-Cu<sub>2</sub>O showed excellent photocatalytic activity for the degradation of tetracycline under visible light irradiation, with efficiency of 85.7%. Superoxide radicals (·O<sub>2</sub><sup>−</sup>) were proven to be the main active species in the photocatalytic degradation process. Cycling stability tests revealed that 10%AgI@20%Br-Cu<sub>2</sub>O maintained approximately 94.4% of its initial activity over five cycles, significantly outperforming AgI@Cu<sub>2</sub>O. In summary, AgI@Br-Cu<sub>2</sub>O composites show great potential for environmental remediation applications due to their excellent photocatalytic activity and stability.</p>

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Construction of AgI@Br-Cu2O Composite with Improved Photocatalytic Performance and Stability Under Visible Light

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Zhenting Chen,
  • Zhiguo Sun,
  • Shengwen Chen,
  • Jifen Wang

摘要

In this study, spherical Br-Cu2O was successfully synthesized by a one-step hydrothermal method, and AgI@Br-Cu2O composite photocatalysts were prepared by loading AgI nanoparticles on them using liquid-phase deposition. The catalysts were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and electrochemical impedance spectroscopy (EIS) for their microscopic morphology and photoelectronic properties. The results showed that Br doping reduced the bandgap of Cu2O, enhanced the visible light absorption, and improved the photocatalytic performance by promoting the formation of oxygen vacancies. Under the optimal composite ratio, 10% AgI@20% Br-Cu2O showed excellent photocatalytic activity for the degradation of tetracycline under visible light irradiation, with efficiency of 85.7%. Superoxide radicals (·O2−) were proven to be the main active species in the photocatalytic degradation process. Cycling stability tests revealed that 10%AgI@20%Br-Cu2O maintained approximately 94.4% of its initial activity over five cycles, significantly outperforming AgI@Cu2O. In summary, AgI@Br-Cu2O composites show great potential for environmental remediation applications due to their excellent photocatalytic activity and stability.