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<p>In this work, a hollow cubic CuS was synthesized via the etching of Cu<sub>2</sub>O, followed by the in-situ growth of graphdiyne (GDY) on its surface to yield a CuS/GDY composite nanozyme. The synergistic interaction between CuS and GDY endowed the nanozyme with pronounced peroxidase-like activity, facilitating the oxidation of substrates such as TMB, OPD, and ABTS in the presence of H<sub>2</sub>O<sub>2</sub>. Kinetic studies indicated a higher affinity of CuS/GDY for TMB compared to horseradish peroxidase (HRP), with a lower K<sub>m</sub> value for TMB. Radical scavenging experiments identified hydroxyl radicals (·OH) and singlet oxygen (<sup>1</sup>O<sub>2</sub>) as the primary reactive oxygen species (ROS) responsible for the catalytic oxidation. CuS/GDY also exhibited exceptional catalytic degradation of Rhodamine B (Rh B), achieving a degradation rate of 90.5% within 40&#xa0;min. Moreover, the composite exhibited excellent stability and recyclability in complex aqueous environments, the catalyst's reusability was confirmed with over 70% efficiency after multiple cycles, demonstrating its potential as a novel, continuous approach for efficient wastewater treatment and environmental remediation.</p> Graphical abstract <p></p>

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Kinetics and mechanism of copper sulfide/graphdiyne nanozyme with enhanced peroxidase-like activity for efficient dye degradation

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Fuguo Ge,
  • Yujian Sun,
  • Haoxin Li,
  • Luyao Ren,
  • Hailian Xiao,
  • Yun Liu,
  • Qiang Bai,
  • Ning Sui,
  • Lina Wang

摘要

In this work, a hollow cubic CuS was synthesized via the etching of Cu2O, followed by the in-situ growth of graphdiyne (GDY) on its surface to yield a CuS/GDY composite nanozyme. The synergistic interaction between CuS and GDY endowed the nanozyme with pronounced peroxidase-like activity, facilitating the oxidation of substrates such as TMB, OPD, and ABTS in the presence of H2O2. Kinetic studies indicated a higher affinity of CuS/GDY for TMB compared to horseradish peroxidase (HRP), with a lower Km value for TMB. Radical scavenging experiments identified hydroxyl radicals (·OH) and singlet oxygen (1O2) as the primary reactive oxygen species (ROS) responsible for the catalytic oxidation. CuS/GDY also exhibited exceptional catalytic degradation of Rhodamine B (Rh B), achieving a degradation rate of 90.5% within 40 min. Moreover, the composite exhibited excellent stability and recyclability in complex aqueous environments, the catalyst's reusability was confirmed with over 70% efficiency after multiple cycles, demonstrating its potential as a novel, continuous approach for efficient wastewater treatment and environmental remediation.

Graphical abstract