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Effect of Mn-based magnetic biochar /PS reaction system on oxidation of metronidazole

Jiayi Luo1, Yunqiang Yi1, Zhanqiang Fang1

  • 1School of Environment, South China Normal University, Guangzhou, 510006, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou, 510006, China; SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan, 511517, China.

Chemosphere
|April 29, 2023
PubMed

Insights

Manganese-modified magnetic biochar significantly enhances persulfate activation for degrading the antifungal drug metronidazole. This novel catalyst system achieved 95.6% degradation, offering a promising solution for water purification.

Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Catalysis

Background:

  • Magnetic biochar is a promising material for water treatment.
  • Persulfate activation is crucial for degrading persistent organic pollutants.
  • Optimizing magnetic biochar catalysts is essential for efficient pollutant removal.

Purpose of the Study:

  • To synthesize and evaluate manganese-modified magnetic biochar (MMBC) for persulfate activation.
  • To investigate the degradation of metronidazole (MNZ) using the MMBC/persulfate system.
  • To elucidate the mechanism of enhanced catalytic activity.

Main Methods:

  • Impregnation-pyrolysis method for synthesizing MMBC.
  • Batch experiments to assess MNZ degradation efficiency.
  • Characterization techniques (e.g., physicochemical analysis, Fe(II) quantification, masking experiments) to understand the catalytic mechanism.

Main Results:

  • MMBC exhibited a 13.0-fold higher MNZ degradation efficiency compared to unmodified magnetic biochar.
  • The MMBC/persulfate system achieved 95.6% MNZ degradation.
  • Doping with manganese significantly increased Fe(II) content in the biochar, enhancing persulfate activation.

Conclusions:

  • Manganese modification is an effective strategy to optimize magnetic biochar for persulfate activation.
  • Both Fe(II) and Mn(II) play key roles in activating persulfate.
  • The MMBC/persulfate system demonstrates high efficiency for removing metronidazole and potentially other organic contaminants.
Keywords:
Advanced oxidationMagnetic biocharMetronidazoleMn-dopedPersulfate

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