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<p>The weak light absorption, low charge separation efficiency, and poor recyclability severely restrict the practical application of heterogeneous photo-Fenton catalyst MIL-100(Fe). Herein, we report the synthesis of Fe<sub>3</sub>O<sub>4</sub>@MIL-100(Fe) with tunable structures via hydrothermal growth, using Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O and H<sub>3</sub>btc as precursors on an Ag/Fe<sub>3</sub>O<sub>4</sub> template. Notably, Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O serves dual roles: it acts as a precursor for MIL-100(Fe) formation and as an oxidizing agent to remove the Ag template. The microstructure of the resulting catalyst can be precisely regulated by varying the Fe<sup>3⁺</sup> dosage. By optimizing the Fe(NO<sub>3</sub>)<sub>3</sub>·9H<sub>2</sub>O dosage, the optimal hollow Fe<sub>3</sub>O<sub>4</sub>/MIL-100(Fe) catalyst is obtained, which exhibits excellent dispersion, a distinct core/shell structure, a larger specific surface area (312.6 m<sup>2</sup>/g), a smaller average pore diameter (4.9298 nm), strong magnetic separability, and superior photo-Fenton degradation performance (95.6% within 30 min). After 4 consecutive cycles, the degradation efficiency toward Rhodamine B (RhB) remains above 90%, demonstrating outstanding cycling stability. Electron spin resonance (ESR) analysis confirms that both ·O<sub>2</sub>⁻ and ·OH are the dominant reactive oxygen species responsible for the catalytic degradation reactions.</p>

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Fe3+ regulated synthesis of Fe3O4@MIL-100(Fe): nanoarchitectonics and enhanced photo-Fenton activity

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Hui Wang,
  • Jun Liu,
  • Meng-Jie Chang,
  • Jia Li,
  • Qing Feng,
  • Bo Jia

摘要

The weak light absorption, low charge separation efficiency, and poor recyclability severely restrict the practical application of heterogeneous photo-Fenton catalyst MIL-100(Fe). Herein, we report the synthesis of Fe3O4@MIL-100(Fe) with tunable structures via hydrothermal growth, using Fe(NO3)3·9H2O and H3btc as precursors on an Ag/Fe3O4 template. Notably, Fe(NO3)3·9H2O serves dual roles: it acts as a precursor for MIL-100(Fe) formation and as an oxidizing agent to remove the Ag template. The microstructure of the resulting catalyst can be precisely regulated by varying the Fe3⁺ dosage. By optimizing the Fe(NO3)3·9H2O dosage, the optimal hollow Fe3O4/MIL-100(Fe) catalyst is obtained, which exhibits excellent dispersion, a distinct core/shell structure, a larger specific surface area (312.6 m2/g), a smaller average pore diameter (4.9298 nm), strong magnetic separability, and superior photo-Fenton degradation performance (95.6% within 30 min). After 4 consecutive cycles, the degradation efficiency toward Rhodamine B (RhB) remains above 90%, demonstrating outstanding cycling stability. Electron spin resonance (ESR) analysis confirms that both ·O2⁻ and ·OH are the dominant reactive oxygen species responsible for the catalytic degradation reactions.