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<p>Strontium titanate (SrTiO<sub>3</sub>) has been reckoned as a remarkable photocatalyst for wastewater treatment due to its suitable conduction band edge for superoxide radicals (<b>•</b>O<sub>2</sub>⁻) generation. However, the rapid charge recombination rate of SrTiO<sub>3</sub> has repressed its photocatalytic performance. Herein, Bi<sup>3+</sup>/Bi<sup>0</sup> species modified SrTiO<sub>3</sub> (Bi-SrTiO<sub>3</sub>) photocatalysts were prepared and applied to tetracycline hydrochloride (TCH) degradation. Compared with pure SrTiO<sub>3</sub>, the resulting Bi-SrTiO<sub>3</sub> photocatalysts displayed significantly boosted catalytic efficiency under light irradiation. The optimal 4%Bi-SrTiO<sub>3</sub> photocatalysts presented the highest degradation efficiency, which is about 2.64 times that of pure SrTiO<sub>3</sub>. The improved catalytic activity of Bi-SrTiO<sub>3</sub> photocatalysts was mainly ascribed to the introduction of Bi<sup>3+</sup>/Bi<sup>0</sup> species, which enhances the separation of photogenerated carriers. According to the electron paramagnetic resonance (EPR) tests, the possible mechanism was also proposed, which confirms that h<sup>+</sup> and <b>•</b>O<sub>2</sub>⁻ radicals are the main reactive species for TCH degradation. The present work supplies a feasible method to synthesis of efficient SrTiO<sub>3</sub>-based photocatalysts for tetracyclines decomposition in wastewater.</p>

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Bi3+/Bi0 species modified SrTiO3 for highly active photocatalytic tetracyclines degradation

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Yan Guo,
  • Muhammad Arslan Mushtaq,
  • Aisha Usman,
  • Yuefa Jia

摘要

Strontium titanate (SrTiO3) has been reckoned as a remarkable photocatalyst for wastewater treatment due to its suitable conduction band edge for superoxide radicals (•O2⁻) generation. However, the rapid charge recombination rate of SrTiO3 has repressed its photocatalytic performance. Herein, Bi3+/Bi0 species modified SrTiO3 (Bi-SrTiO3) photocatalysts were prepared and applied to tetracycline hydrochloride (TCH) degradation. Compared with pure SrTiO3, the resulting Bi-SrTiO3 photocatalysts displayed significantly boosted catalytic efficiency under light irradiation. The optimal 4%Bi-SrTiO3 photocatalysts presented the highest degradation efficiency, which is about 2.64 times that of pure SrTiO3. The improved catalytic activity of Bi-SrTiO3 photocatalysts was mainly ascribed to the introduction of Bi3+/Bi0 species, which enhances the separation of photogenerated carriers. According to the electron paramagnetic resonance (EPR) tests, the possible mechanism was also proposed, which confirms that h+ and •O2⁻ radicals are the main reactive species for TCH degradation. The present work supplies a feasible method to synthesis of efficient SrTiO3-based photocatalysts for tetracyclines decomposition in wastewater.