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<p>P-MoO<sub>3</sub>-Gd<sub>2</sub>O<sub>3</sub> S-scheme heterojunction photocatalyst was constructed through in-situ thermal decomposition of sodium phosphomolybdate combined with hydrothermal strategy. The results showed that P was uniformly doped into the MoO<sub>3</sub> lattice, and Gd<sub>2</sub>O<sub>3</sub> was closely combined with P-MoO<sub>3</sub> at the nanoscale. The specific surface area of the composite material increased to 49.34 m<sup>2</sup>/g, and the surface hydrophilicity was significantly improved. The construction of the S-scheme heterojunction moderately extends the lifetime of photogenerated carriers. Photocatalytic experiments demonstrated that the degradation activity of P-MoO<sub>3</sub>-Gd<sub>2</sub>O<sub>3</sub> towards oxytetracycline was significantly higher than that of pure Gd<sub>2</sub>O<sub>3</sub> and P-MoO<sub>3</sub>, maintaining good catalytic performance in the pH range of 7 to 13, and showing resistance to common cations in water. Based on Liquid chromatography-mass spectrometry (LC-MS) result, three parallel pathways of deamination, side chain cleavage, and aromatic ring opening were proposed. Computational toxicology simulation suggests that the small-molecule intermediates possess lower toxicity than OTC, whereas early degradation intermediates still exhibit high ecological risks. This research provides an idea for the preparation of S-scheme heterojunction photocatalysts for the purification of water contaminated by antibiotics.</p> Graphical Abstract <p></p>

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Phosphorus-Doped MoO3/Gd2O3 S-Scheme Heterojunction: Fast Charge Transfer and Efficient Oxytetracycline Degradation

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Wenjing Wu,
  • Lijing Wang,
  • Yanming Kuang,
  • Xiangyu Xu,
  • Yang Yi,
  • Jiaming Liu,
  • Qizhi Wu,
  • Benjie Zhao,
  • Yonggao Yue

摘要

P-MoO3-Gd2O3 S-scheme heterojunction photocatalyst was constructed through in-situ thermal decomposition of sodium phosphomolybdate combined with hydrothermal strategy. The results showed that P was uniformly doped into the MoO3 lattice, and Gd2O3 was closely combined with P-MoO3 at the nanoscale. The specific surface area of the composite material increased to 49.34 m2/g, and the surface hydrophilicity was significantly improved. The construction of the S-scheme heterojunction moderately extends the lifetime of photogenerated carriers. Photocatalytic experiments demonstrated that the degradation activity of P-MoO3-Gd2O3 towards oxytetracycline was significantly higher than that of pure Gd2O3 and P-MoO3, maintaining good catalytic performance in the pH range of 7 to 13, and showing resistance to common cations in water. Based on Liquid chromatography-mass spectrometry (LC-MS) result, three parallel pathways of deamination, side chain cleavage, and aromatic ring opening were proposed. Computational toxicology simulation suggests that the small-molecule intermediates possess lower toxicity than OTC, whereas early degradation intermediates still exhibit high ecological risks. This research provides an idea for the preparation of S-scheme heterojunction photocatalysts for the purification of water contaminated by antibiotics.

Graphical Abstract