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<p>In this study, Tb/Mg-doped TiO<sub>2</sub> responsive to visible light was successfully prepared using a novel liquid-phase plasma synthesis method, and its photocatalytic activity was evaluated for use in the doxycycline decomposition reaction. The Ti-O-Tb and Ti-O-Mg bonds dispersed in the gaps of the TiO<sub>2</sub> lattice by doping formed a charge imbalance, which effectively separated the photogenerated electrons and holes and suppressed their recombination by generating more oxygen vacancies and Ti<sup>3+</sup>. The Tb/Mg-doped TiO<sub>2</sub> photocatalyst showed a decomposition reaction rate constant (k) that was up to twice that of bare TiO<sub>2</sub>. When the two components were co-doped, the band gap energy and PL emission were weakened to the maximum because of the synergistic effect achieved, compared to doping with only one component. In addition, the photoelectric effect was enhanced by increasing electron-hole separation, suppressing recombination, and increasing the generation of strong oxidants. Tb/Mg-doped TiO<sub>2</sub> prepared by LPPSM was a reusable photocatalyst with stable photocatalytic activity, and doxycycline was estimated to be decomposed through two pathways: hydroxylation, deamination, decarboxylation, C–C bond cleavage, and a ring-opening reaction.</p>

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Decomposition Characteristics of Doxycycline by Visible-Light-Active Tb/Mg-Doped TiO₂ Photocatalyst Prepared using Liquid-Phase Plasma Synthesis Method

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Chan-Seo You,
  • Jun-Young Noh,
  • Yunju Choi,
  • Sang-Chul Jung

摘要

In this study, Tb/Mg-doped TiO2 responsive to visible light was successfully prepared using a novel liquid-phase plasma synthesis method, and its photocatalytic activity was evaluated for use in the doxycycline decomposition reaction. The Ti-O-Tb and Ti-O-Mg bonds dispersed in the gaps of the TiO2 lattice by doping formed a charge imbalance, which effectively separated the photogenerated electrons and holes and suppressed their recombination by generating more oxygen vacancies and Ti3+. The Tb/Mg-doped TiO2 photocatalyst showed a decomposition reaction rate constant (k) that was up to twice that of bare TiO2. When the two components were co-doped, the band gap energy and PL emission were weakened to the maximum because of the synergistic effect achieved, compared to doping with only one component. In addition, the photoelectric effect was enhanced by increasing electron-hole separation, suppressing recombination, and increasing the generation of strong oxidants. Tb/Mg-doped TiO2 prepared by LPPSM was a reusable photocatalyst with stable photocatalytic activity, and doxycycline was estimated to be decomposed through two pathways: hydroxylation, deamination, decarboxylation, C–C bond cleavage, and a ring-opening reaction.