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Abstract <p>A ternary Z-scheme heterojunction photocatalyst, BiOBr/TiO<sub>2</sub>/NH<sub>2</sub>-UiO-66(Zr), was constructed to enhance the visible-light-driven degradation of tetracycline (TC). This composite material was synthesized via hydrothermal and in situ growth methods, and its microstructure and properties were analyzed through a series of systematic characterizations. The introduction of NH<sub>2</sub>-UiO-66 significantly increased the specific surface area and visible light absorption while promoting the separation and transport of photogenerated charge carriers. Under visible light irradiation, the optimal composite (BTU-2) achieved a TC degradation rate of 96.3% within 80&#xa0;min, with a reaction rate constant 9.41, 12.03, and 8.58 times higher than those of pure BiOBr, TiO<sub>2</sub> nanowires (NWs), and NH<sub>2</sub>-UiO-66, respectively. Trapping experiments and electron paramagnetic resonance (EPR) analysis confirmed that h<sup>+</sup> and ‧O<sub>2</sub><sup>−</sup> were the dominant active species. Liquid chromatography–mass spectrometry (LC–MS) further elucidated the possible TC degradation pathways. This work provides a feasible strategy for designing efficient visible-light-responsive photocatalysts for antibiotic wastewater treatment.</p> Graphical abstract <p></p>

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Promoting tetracycline degradation via synergistic effects of BiOBr/TiO2/NH2-UiO-66 ternary Z-scheme heterojunctions under visible light irradiation

  • 期刊论文

  • 发表日期：

    2026年1月18日

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  • Mingming Dong,
  • Shuyong Yang,
  • Anshun Wang,
  • Peng Zhou,
  • Zewen Huang,
  • Shenghui Tu

摘要

Abstract

A ternary Z-scheme heterojunction photocatalyst, BiOBr/TiO2/NH2-UiO-66(Zr), was constructed to enhance the visible-light-driven degradation of tetracycline (TC). This composite material was synthesized via hydrothermal and in situ growth methods, and its microstructure and properties were analyzed through a series of systematic characterizations. The introduction of NH2-UiO-66 significantly increased the specific surface area and visible light absorption while promoting the separation and transport of photogenerated charge carriers. Under visible light irradiation, the optimal composite (BTU-2) achieved a TC degradation rate of 96.3% within 80 min, with a reaction rate constant 9.41, 12.03, and 8.58 times higher than those of pure BiOBr, TiO2 nanowires (NWs), and NH2-UiO-66, respectively. Trapping experiments and electron paramagnetic resonance (EPR) analysis confirmed that h+ and ‧O2− were the dominant active species. Liquid chromatography–mass spectrometry (LC–MS) further elucidated the possible TC degradation pathways. This work provides a feasible strategy for designing efficient visible-light-responsive photocatalysts for antibiotic wastewater treatment.

Graphical abstract