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<p>A bimetallic Fe–Mn oxide supported on bamboo leaf-derived biochar (Fe–Mn/biochar) was successfully synthesized via an impregnation–desiccation technique, and its catalytic efficacy in the ozonation of Rhodamine B (RhB) was evaluated. Characterization using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis showed that successful formation of Fe–Mn spinel-type oxides on the biochar surface, Fe–Mn/biochar has a larger surface area (289 m<sup>2</sup>/g) and more oxygen-containing functional groups than unmodified biochar. These attributes improve ozone adsorption and accelerate the formation of reactive radical species, which enhances RhB degradation. Compared to unmodified biochar, the Fe–Mn/biochar composite demonstrated a significant improvement in catalytic performance, achieving 53.1% total organic carbon (TOC) removal and 94.5% chemical oxygen demand (COD) removal at pH 7, using an ozone flow rate of 1 L/min and a catalyst dosage of 10&#xa0;g/L. The findings highlight the potential of Fe–Mn/biochar as a cost-effective and efficient catalyst for advanced oxidation processes, particularly in the treatment of dye wastewater.</p> Graphical Abstract <p></p>

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Rhodamine B removal via ozonation catalyzed by bamboo leaf biochar with Fe–Mn bimetallic oxides

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Jinye Li,
  • Jiaying Wang,
  • Yirong Zhu,
  • Zhenyuan Zhou,
  • Ziwei Shen,
  • Yifan Liu,
  • Ming Zhang,
  • Hailu Fu

摘要

A bimetallic Fe–Mn oxide supported on bamboo leaf-derived biochar (Fe–Mn/biochar) was successfully synthesized via an impregnation–desiccation technique, and its catalytic efficacy in the ozonation of Rhodamine B (RhB) was evaluated. Characterization using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) surface area analysis showed that successful formation of Fe–Mn spinel-type oxides on the biochar surface, Fe–Mn/biochar has a larger surface area (289 m2/g) and more oxygen-containing functional groups than unmodified biochar. These attributes improve ozone adsorption and accelerate the formation of reactive radical species, which enhances RhB degradation. Compared to unmodified biochar, the Fe–Mn/biochar composite demonstrated a significant improvement in catalytic performance, achieving 53.1% total organic carbon (TOC) removal and 94.5% chemical oxygen demand (COD) removal at pH 7, using an ozone flow rate of 1 L/min and a catalyst dosage of 10 g/L. The findings highlight the potential of Fe–Mn/biochar as a cost-effective and efficient catalyst for advanced oxidation processes, particularly in the treatment of dye wastewater.

Graphical Abstract