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<p>In this study, a Z-scheme heterojunction photocatalyst was successfully synthesized via a hydrothermal approach by coupling protonated g-C<sub>3</sub>N<sub>4</sub> derived from hydrochloric acid modification with the solid solution BiOI<sub>0.8</sub>Br<sub>0.2</sub>. The as-prepared material was systematically characterized using XRD, FT-IR, SEM, HRTEM, XPS, PL, and photoelectrochemical measurements to evaluate its crystalline structure, surface morphology, elemental chemical states, defect features, and optical as well as photoelectrochemical properties. HRTEM analysis revealed a nanoflower-like architecture in which ultrathin g-C<sub>3</sub>N<sub>4</sub> nanosheets were uniformly anchored onto the surface of BiOI<sub>0.8</sub>Br<sub>0.2</sub> nanoflowers, facilitating intimate interfacial contact between the two components. Electrochemical impedance spectroscopy and transient photocurrent response measurements demonstrated a marked reduction in interfacial resistance and a significant increase in current density, indicating enhanced charge transfer efficiency at the heterojunction interface and promoting effective separation and rapid migration of photogenerated electron–hole pairs. Under the Z-scheme charge transfer mechanism, electrons from the conduction band of BiOI<sub>0.8</sub>Br<sub>0.2</sub> recombine with holes from the valence band of g-C<sub>3</sub>N<sub>4</sub> at the interface, thereby preserving highly reductive electrons in the g-C<sub>3</sub>N₄ component and highly oxidative holes in BiOI<sub>0.8</sub>Br<sub>0.2</sub>. This spatial charge separation significantly enhances the redox capability of the system. Consequently, the resulting photocatalyst exhibited outstanding degradation performance toward RhB and ENR under light irradiation, with high efficiency and excellent stability. Furthermore, recycling experiments confirmed that the catalyst retained high activity and structural integrity over multiple cycles, underscoring its robustness and potential for practical applications in environmental remediation.</p>

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Preparation and photocatalytic performance evaluation of flower-like g-C3N4/BiOI0.8Br0.2 Z-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Huixia Zhang,
  • Tonghua Wu,
  • Xianghua Jia,
  • Tianru Qin

摘要

In this study, a Z-scheme heterojunction photocatalyst was successfully synthesized via a hydrothermal approach by coupling protonated g-C3N4 derived from hydrochloric acid modification with the solid solution BiOI0.8Br0.2. The as-prepared material was systematically characterized using XRD, FT-IR, SEM, HRTEM, XPS, PL, and photoelectrochemical measurements to evaluate its crystalline structure, surface morphology, elemental chemical states, defect features, and optical as well as photoelectrochemical properties. HRTEM analysis revealed a nanoflower-like architecture in which ultrathin g-C3N4 nanosheets were uniformly anchored onto the surface of BiOI0.8Br0.2 nanoflowers, facilitating intimate interfacial contact between the two components. Electrochemical impedance spectroscopy and transient photocurrent response measurements demonstrated a marked reduction in interfacial resistance and a significant increase in current density, indicating enhanced charge transfer efficiency at the heterojunction interface and promoting effective separation and rapid migration of photogenerated electron–hole pairs. Under the Z-scheme charge transfer mechanism, electrons from the conduction band of BiOI0.8Br0.2 recombine with holes from the valence band of g-C3N4 at the interface, thereby preserving highly reductive electrons in the g-C3N₄ component and highly oxidative holes in BiOI0.8Br0.2. This spatial charge separation significantly enhances the redox capability of the system. Consequently, the resulting photocatalyst exhibited outstanding degradation performance toward RhB and ENR under light irradiation, with high efficiency and excellent stability. Furthermore, recycling experiments confirmed that the catalyst retained high activity and structural integrity over multiple cycles, underscoring its robustness and potential for practical applications in environmental remediation.