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<p> Perfluorooctanoic acid (PFOA) is a highly fluorinated organic compound with a chemical formula C<sub>8</sub>HF<sub>15</sub>O<sub>2</sub>. Due to its tendency to be accumulatied in the human body and other organisms, and the stability of its C-F chemical bonds in the environment, it poses significant potential risks to both the environment and human health. In order to seek more effective removal technologies, a BiFeO₃/Bi₅O₇I composite material with n-n heterojunction was synthesized by calcination of a metal-organic framework (MOF) composite material, BiOI/MIL-101(Fe), at 600°C for 5 h.This material could efficiently photodegrade PFOA under visible light. When the catalyst dosage was 15 mg, the <i>p</i>H was 4, and the initial concentration of PFOA was 10 mg·L<sup>-1</sup>, the catalytic degradation efficiency of PFOA could reach up to 91%. It was found that the existence of n-n heterojunction between BiFeO<sub>3</sub> and Bi<sub>5</sub>O<sub>7</sub>I made the photogenerated electron-hole pairs be effectively separated, which greatly improved electron mobility and photocatalytic activity of the material. Furthermore, reusability analysis confirmed that photocatalytic efficiency could remain above 90% even after three successive runs. Overall, the findings provide important insights into the roles of carbonaceous modification of MOFs in enhanced photocatalytic destruction of PFOA and the reusability, which may guide the future design and fabrication of environment-friendly adsorptive photocatalysts.</p>

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Visible-light-driven photocatalytic removal of PFOA from water: enhanced performance and mechanism with MOF-derived BiFeO3/Bi5O7I

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Sumei Li,
  • Jianan Li,
  • Jian Ji,
  • Hanbing Li,
  • Sha Chen,
  • Mengxin Yuan,
  • Danyang Li

摘要

Perfluorooctanoic acid (PFOA) is a highly fluorinated organic compound with a chemical formula C8HF15O2. Due to its tendency to be accumulatied in the human body and other organisms, and the stability of its C-F chemical bonds in the environment, it poses significant potential risks to both the environment and human health. In order to seek more effective removal technologies, a BiFeO₃/Bi₅O₇I composite material with n-n heterojunction was synthesized by calcination of a metal-organic framework (MOF) composite material, BiOI/MIL-101(Fe), at 600°C for 5 h.This material could efficiently photodegrade PFOA under visible light. When the catalyst dosage was 15 mg, the pH was 4, and the initial concentration of PFOA was 10 mg·L-1, the catalytic degradation efficiency of PFOA could reach up to 91%. It was found that the existence of n-n heterojunction between BiFeO3 and Bi5O7I made the photogenerated electron-hole pairs be effectively separated, which greatly improved electron mobility and photocatalytic activity of the material. Furthermore, reusability analysis confirmed that photocatalytic efficiency could remain above 90% even after three successive runs. Overall, the findings provide important insights into the roles of carbonaceous modification of MOFs in enhanced photocatalytic destruction of PFOA and the reusability, which may guide the future design and fabrication of environment-friendly adsorptive photocatalysts.