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<p>To develop high performance with wide pH adaptability catalysts for advanced oxidation processes, Co/N Co-doped carbon nanotubes encapsulating cobalt nanoparticles (Co@N-CNTs-x/y) were prepared by pyrolysis of dicyandiamide (DCD)-coated bimetallic zeolitic imidazole frameworks (Co<sub>x</sub>Zn<sub>y</sub>-ZIF) rapidly synthesized in supercritical carbon dioxide (sc-CO<sub>2</sub>). The <i>in situ</i> growth of carbon nanotubes resulted in a more uniform distribution of cobalt atoms, forming abundant Co-N<sub>x</sub> structures, and effectively encapsulating cobalt nanoparticles within the nanotubes, thereby reducing cobalt leakage. The doping of zinc and its subsequent volatilization at high temperatures significantly impacted the Co-N<sub>x</sub> doping ratio, the diameter of the nanotubes, and the size and dispersion of cobalt nanoparticles (Co NPs). A non-radical catalytic mechanism dominated by electron transfer was proposed for hollow-structured Co@N-CNTs-1/1, enabling it to exhibit high bisphenol A (BPA) degradation efficiency across a pH range of 3–11 and tolerate various inorganic anions.</p>

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Carbon nanotubes in situ derived from bimetallic ZIF as efficient peroxymonosulfate activators for bisphenol A degradation via electron transfer

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Yu Gao,
  • Qiang Han,
  • Yuan Chen,
  • Dongdong Jia,
  • Yongyue Sun

摘要

To develop high performance with wide pH adaptability catalysts for advanced oxidation processes, Co/N Co-doped carbon nanotubes encapsulating cobalt nanoparticles (Co@N-CNTs-x/y) were prepared by pyrolysis of dicyandiamide (DCD)-coated bimetallic zeolitic imidazole frameworks (CoxZny-ZIF) rapidly synthesized in supercritical carbon dioxide (sc-CO2). The in situ growth of carbon nanotubes resulted in a more uniform distribution of cobalt atoms, forming abundant Co-Nx structures, and effectively encapsulating cobalt nanoparticles within the nanotubes, thereby reducing cobalt leakage. The doping of zinc and its subsequent volatilization at high temperatures significantly impacted the Co-Nx doping ratio, the diameter of the nanotubes, and the size and dispersion of cobalt nanoparticles (Co NPs). A non-radical catalytic mechanism dominated by electron transfer was proposed for hollow-structured Co@N-CNTs-1/1, enabling it to exhibit high bisphenol A (BPA) degradation efficiency across a pH range of 3–11 and tolerate various inorganic anions.