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<p>Valorizing organic waste to yield high-end products should be a key waste management approach in the future. Herein, a series of nitrogen-doped peanut shell derived-biochars loaded with Co nanoparticles (C-N<sub><i>x</i></sub>-Co<sub><i>y</i></sub>) were successfully synthesized at different pyrolysis temperatures. In particular, the C-N<sub>3</sub>-Co<sub>0.5</sub>(800) material prepared under certain conditions demonstrated high efficiency in activating peroxymonosulfate (PMS) to degrade acetaminophen (ACE), achieving complete removal of 20&#xa0;mg/L ACE within 5&#xa0;min. The catalyst exhibited broad operational pH adaptability (pH = 3 ~ 11) and maintained robust performance in the presence of inorganic ions and complex water matrices. Furthermore, minimal cobalt leaching ensured environmental safety by preventing secondary contamination. Mechanistic investigations via quenching experiments, electron paramagnetic resonance (EPR) spectroscopy and electrochemical experiences identified a synergistic degradation mechanism involving radical pathways (•OH and SO<sub>4</sub><sup>•−</sup>), non-radical pathway (<sup>1</sup>O<sub>2</sub>-mediated oxidation), and electron transfer pathway. Combining eco-friendly biomass precursors with efficient catalytic performance, this work provides a feasible strategy for designing practical wastewater treatment systems.</p>

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Co NPs@N-Doped Peanut Shell-derived Biochar As an Efficient Catalyst for Peroxymonosulfate Activation in Acetaminophen Degradation

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Xiaoxin Chen,
  • Xingzi Zhu,
  • Caiyan Ge,
  • Jinxin Wang,
  • Manli Guo,
  • Yujuan Cao,
  • Bixia Lin

摘要

Valorizing organic waste to yield high-end products should be a key waste management approach in the future. Herein, a series of nitrogen-doped peanut shell derived-biochars loaded with Co nanoparticles (C-Nx-Coy) were successfully synthesized at different pyrolysis temperatures. In particular, the C-N3-Co0.5(800) material prepared under certain conditions demonstrated high efficiency in activating peroxymonosulfate (PMS) to degrade acetaminophen (ACE), achieving complete removal of 20 mg/L ACE within 5 min. The catalyst exhibited broad operational pH adaptability (pH = 3 ~ 11) and maintained robust performance in the presence of inorganic ions and complex water matrices. Furthermore, minimal cobalt leaching ensured environmental safety by preventing secondary contamination. Mechanistic investigations via quenching experiments, electron paramagnetic resonance (EPR) spectroscopy and electrochemical experiences identified a synergistic degradation mechanism involving radical pathways (•OH and SO4•−), non-radical pathway (1O2-mediated oxidation), and electron transfer pathway. Combining eco-friendly biomass precursors with efficient catalytic performance, this work provides a feasible strategy for designing practical wastewater treatment systems.