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<p>The advancement of visible-light-activated, efficient, and stable photocatalysts bears significance in the mitigation of environmental pollution. A novel Z-scheme BiOI@ZnFe<sub>2</sub>O<sub>4</sub> heterojunction photocatalyst, synthesized by a straightforward hydrothermal method, was aimed at Rhodamine B (RhB) degradation in this study. The composite’s markedly enhanced visible-light absorption and suppressed charge carrier recombination were demonstrated through characterization techniques such as UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and photoelectrochemical analyses. The optimized BiOI5ZFO sample, remarkably, achieved the complete degradation of 10&#xa0;mg/L RhB within 30&#xa0;min under visible-light irradiation, with a reaction rate constant 2.5-fold that of pristine BiOI. Superoxide radicals (·O₂⁻) were identified, by radical scavenging experiments, as the predominant reactive species for the photocatalytic activity. The catalyst, owing to its magnetic separability, displayed excellent recyclability and structural stability, retaining 81.4% degradation efficiency after three consecutive cycles. A strategic design of a Z-scheme heterojunction system, presented in this work, holds promising potential for high-performance photocatalytic wastewater treatment applications.</p>

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Sunlight-powered RhB degradation by a novel BiOI@ZnFe₂O₄ Z-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2026年4月8日

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  • Runpei Zhang,
  • Shujuan Wu,
  • Zhiqiang Wei,
  • Hongxia Qiao

摘要

The advancement of visible-light-activated, efficient, and stable photocatalysts bears significance in the mitigation of environmental pollution. A novel Z-scheme BiOI@ZnFe2O4 heterojunction photocatalyst, synthesized by a straightforward hydrothermal method, was aimed at Rhodamine B (RhB) degradation in this study. The composite’s markedly enhanced visible-light absorption and suppressed charge carrier recombination were demonstrated through characterization techniques such as UV–Vis diffuse reflectance spectroscopy (DRS), photoluminescence (PL), and photoelectrochemical analyses. The optimized BiOI5ZFO sample, remarkably, achieved the complete degradation of 10 mg/L RhB within 30 min under visible-light irradiation, with a reaction rate constant 2.5-fold that of pristine BiOI. Superoxide radicals (·O₂⁻) were identified, by radical scavenging experiments, as the predominant reactive species for the photocatalytic activity. The catalyst, owing to its magnetic separability, displayed excellent recyclability and structural stability, retaining 81.4% degradation efficiency after three consecutive cycles. A strategic design of a Z-scheme heterojunction system, presented in this work, holds promising potential for high-performance photocatalytic wastewater treatment applications.