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<p>A novel dual Z-scheme BiOBr/NH<sub>2</sub>-MIL-101(Fe)/g-C<sub>3</sub>N<sub>4</sub> (BNG) heterojunction was constructed via a simple two-step solvothermal process. NH<sub>2</sub>-MIL-101(Fe) nanoparticles and BiOBr microspheres were uniformly deposited on the surface of g-C<sub>3</sub>N<sub>4</sub>. The prepared BNG exhibited significantly enhanced photocatalytic performance for tetracycline (TC) degradation compared to single catalyst. The optimized BNG-19 composite (with 19% NH<sub>2</sub>-MIL-101(Fe)/g-C<sub>3</sub>N<sub>4</sub>) achieved 92.38% degradation of TC within 75&#xa0;min under visible light, which was 2.47, 1.78, and 1.84 times higher than that of pure g-C<sub>3</sub>N<sub>4</sub>, NH<sub>2</sub>-MIL-101(Fe), and BiOBr, respectively. Moreover, the composite exhibited excellent stability with 82.4% removal efficiency after five cycles. The enhanced photocatalytic performance was attributed to the synergistic dual Z-scheme charge transfer mechanism, which was directly evidenced by&#xa0;in-situ irradiated XPS showing opposite directional shifts of Bi 4f (positive) and Fe 2p/N 1s (negative). This unique charge transfer pathway effectively promoted the separation of photogenerated carriers, with •OH and •O<sub>2</sub>⁻ identified as the dominant reactive species. This work provides&#xa0;a new strategy for constructing g-C<sub>3</sub>N<sub>4</sub>-based dual Z-scheme heterostructures&#xa0;with direct mechanistic evidence for efficient environmental remediation.</p>

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Construction of ternary BiOBr/NH2-MIL-101(Fe)/g-C3N4 nanocomposite as an efficient photocatalyst for degradation of tetracycline

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Xu Zhao,
  • Hongyan Guo,
  • Nannan Zhang,
  • Zhi Yue,
  • Xungang Gu

摘要

A novel dual Z-scheme BiOBr/NH2-MIL-101(Fe)/g-C3N4 (BNG) heterojunction was constructed via a simple two-step solvothermal process. NH2-MIL-101(Fe) nanoparticles and BiOBr microspheres were uniformly deposited on the surface of g-C3N4. The prepared BNG exhibited significantly enhanced photocatalytic performance for tetracycline (TC) degradation compared to single catalyst. The optimized BNG-19 composite (with 19% NH2-MIL-101(Fe)/g-C3N4) achieved 92.38% degradation of TC within 75 min under visible light, which was 2.47, 1.78, and 1.84 times higher than that of pure g-C3N4, NH2-MIL-101(Fe), and BiOBr, respectively. Moreover, the composite exhibited excellent stability with 82.4% removal efficiency after five cycles. The enhanced photocatalytic performance was attributed to the synergistic dual Z-scheme charge transfer mechanism, which was directly evidenced by in-situ irradiated XPS showing opposite directional shifts of Bi 4f (positive) and Fe 2p/N 1s (negative). This unique charge transfer pathway effectively promoted the separation of photogenerated carriers, with •OH and •O2⁻ identified as the dominant reactive species. This work provides a new strategy for constructing g-C3N4-based dual Z-scheme heterostructures with direct mechanistic evidence for efficient environmental remediation.