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<p>This study investigates the degradation efficiency of a hydrothermally synthesized g-C<sub>3</sub>N<sub>4</sub>/MIL-125(Ti) heterojunction photocatalyst towards tetracycline. Its performance was compared with those of pure g-C<sub>3</sub>N<sub>4</sub> and MIL-125(Ti). The composition, structure, and morphology of the synthesized composite catalysts were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), diffuse reflectance UV-visible spectroscopy (DRS), and Brunauer-Emmett-Teller (BET) analysis of specific surface area and pore size distribution. Spectrophotometric measurements of tetracycline concentration and radical-quenching experiments revealed that the g-C<sub>3</sub>N<sub>4</sub>/MIL-125(Ti) heterojunction photocatalyst achieved a 96.8% degradation rate for a 50 mg/L tetracycline solution within 120 minutes, significantly surpassing the individual components. Quenching tests identified the superoxide radical (·O<sub>2</sub><sup>−</sup>) as the primary active species. Computational results indicate that the trapezoidal heterojunction photocatalyst, g-C<sub>3</sub>N<sub>4</sub>/MIL-125(Ti), effectively promotes photoinduced charge separation while retaining strong redox capability, which likely accounts for its high catalytic activity in the efficient degradation of tetracycline.</p>

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Construction of an S-scheme g-C3N4/MIL-125(Ti) Heterojunction for Highly Efficient Photocatalytic Degradation of Tetracycline

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Yunfei Jia,
  • Dandan Zhang,
  • Haiyan Tan,
  • Xinhua Cheng,
  • Xinyu Shi,
  • Jie Xiong

摘要

This study investigates the degradation efficiency of a hydrothermally synthesized g-C3N4/MIL-125(Ti) heterojunction photocatalyst towards tetracycline. Its performance was compared with those of pure g-C3N4 and MIL-125(Ti). The composition, structure, and morphology of the synthesized composite catalysts were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), diffuse reflectance UV-visible spectroscopy (DRS), and Brunauer-Emmett-Teller (BET) analysis of specific surface area and pore size distribution. Spectrophotometric measurements of tetracycline concentration and radical-quenching experiments revealed that the g-C3N4/MIL-125(Ti) heterojunction photocatalyst achieved a 96.8% degradation rate for a 50 mg/L tetracycline solution within 120 minutes, significantly surpassing the individual components. Quenching tests identified the superoxide radical (·O2−) as the primary active species. Computational results indicate that the trapezoidal heterojunction photocatalyst, g-C3N4/MIL-125(Ti), effectively promotes photoinduced charge separation while retaining strong redox capability, which likely accounts for its high catalytic activity in the efficient degradation of tetracycline.