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<p>This study innovatively modified LaZnO<sub>3</sub> perovskite with waste spirulina biochar to construct a new photocatalyst system, LaZnO<sub>3</sub>-Biochar (LaZnO<sub>3</sub>-B). For the first time, the low-temperature environment in the Northern Hemisphere was simulated to explore its visible - light degradation of sulfathiazole-type antibiotics and the regeneration strategy. At a low temperature of 0℃, LaZnO<sub>3</sub>-B demonstrated outstanding activity, achieving a sulfathiazole (STZ) conversion rate of 56.5% within 5&#xa0;min and maintaining 52.1% after 105&#xa0;min, breaking through the bottleneck of low efficiency of traditional photocatalysts at low temperatures. Density functional theory (DFT) calculations revealed its structural advantages, with more active sites and a unique core-shell structure ensuring photocatalytic performance at low temperatures and pointing out a direction for the design of novel photocatalysts. The deposition of by-products and pollutants led to the catalyst deactivation. However, simple water rinsing could restore its activity. Even after three rinses, the STZ removal rate was still nearly 50%. This regeneration strategy is simple and efficient, showing great potential for application.</p>

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First synthesis of the LaZnO3 biochar perovskite used as a photocatalyst with the enhanced deactivation mechenism and regenerable performance

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月2日

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  • Ting Guo,
  • Xuefei Tan,
  • Zeyu Tian,
  • Xiaohui Fang,
  • Xinqi Liu,
  • Zhifa Wan

摘要

This study innovatively modified LaZnO3 perovskite with waste spirulina biochar to construct a new photocatalyst system, LaZnO3-Biochar (LaZnO3-B). For the first time, the low-temperature environment in the Northern Hemisphere was simulated to explore its visible - light degradation of sulfathiazole-type antibiotics and the regeneration strategy. At a low temperature of 0℃, LaZnO3-B demonstrated outstanding activity, achieving a sulfathiazole (STZ) conversion rate of 56.5% within 5 min and maintaining 52.1% after 105 min, breaking through the bottleneck of low efficiency of traditional photocatalysts at low temperatures. Density functional theory (DFT) calculations revealed its structural advantages, with more active sites and a unique core-shell structure ensuring photocatalytic performance at low temperatures and pointing out a direction for the design of novel photocatalysts. The deposition of by-products and pollutants led to the catalyst deactivation. However, simple water rinsing could restore its activity. Even after three rinses, the STZ removal rate was still nearly 50%. This regeneration strategy is simple and efficient, showing great potential for application.