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<p>This study prepared carbon nanotube-modified BiFeO₃ (CNT‑BiFeO₃) composite photocatalysts for visible‑light‑driven degradation of ammonia nitrogen. The introduction of CNTs promotes the separation of photogenerated carriers and constructs a type‑II heterojunction with an internal built‑in electric field, which effectively suppresses electron‑hole recombination and improves photocatalytic activity. The optimized CNT‑BiFeO₃ catalyst achieves an ammonia degradation efficiency of 87.43% under visible light. With the assistance of 0.2&#xa0;mmol/L H₂O₂, the degradation efficiency reaches 99.8% within 180&#xa0;min, and ammonia is selectively converted into N₂ without generating nitrite or nitrate. Kinetic analysis indicates that the degradation process follows pseudo‑first‑order kinetics. The composite shows excellent reusability and stability during cycling tests. This work provides a high‑efficiency photocatalytic strategy for ammonia nitrogen removal from wastewater.</p>

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Oxygen species properties generated by carbon nanotube modified BiFeO3 and degradation of ammonia using visible light

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Hengjie Guo,
  • Zeda Meng,
  • Keonha Lee,
  • Won-Chun Oh

摘要

This study prepared carbon nanotube-modified BiFeO₃ (CNT‑BiFeO₃) composite photocatalysts for visible‑light‑driven degradation of ammonia nitrogen. The introduction of CNTs promotes the separation of photogenerated carriers and constructs a type‑II heterojunction with an internal built‑in electric field, which effectively suppresses electron‑hole recombination and improves photocatalytic activity. The optimized CNT‑BiFeO₃ catalyst achieves an ammonia degradation efficiency of 87.43% under visible light. With the assistance of 0.2 mmol/L H₂O₂, the degradation efficiency reaches 99.8% within 180 min, and ammonia is selectively converted into N₂ without generating nitrite or nitrate. Kinetic analysis indicates that the degradation process follows pseudo‑first‑order kinetics. The composite shows excellent reusability and stability during cycling tests. This work provides a high‑efficiency photocatalytic strategy for ammonia nitrogen removal from wastewater.