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<p>It is still greatly desirable to activate peroxymonosulfate (PMS) forming nonradicals for the removal of electron-rich contaminants in complex water matrices. However, achieving this on heterogeneous metal-based catalysts with uniform electron distribution remains challenging due to the asymmetric structure of PMS molecules (H-O-O-SO<sub>3</sub><sup>-</sup>). Here, inspired by the dipole effect, we design a Co-doped ZnO catalyst (ZOC) to break charge symmetry at active sites and enhance nonradicals generation. The high charge density at Co sites facilitates two-electron transfer, promoting O-O and O-H bond cleavage to form high-valent cobalt-oxo (Co<sup>IV</sup>=O), while positively polarized Zn sites drive PMS self-decomposition to generate singlet oxygen (<sup>1</sup>O<sub>2</sub>). As a result, the synergistic system of <sup>1</sup>O<sub>2</sub> and Co<sup>IV</sup> = O results in a k-value of 73.93 min⁻¹ M⁻¹ for aniline (AN) degradation, 189.6 times higher than ZnO/PMS (ZO/PMS), and also shows a high selectivity for electron-rich new pollutants. The practicality of this outstanding nonradicals system is confirmed by a significant increase in biochemical oxygen demand/chemical oxygen demand (BOD/COD) of the mixed wastewater to over 0.55 in the air-lifting internal circulating reactor. This study offers a structural regulation for controlling catalytic functionality and provides general guidelines for designing Fenton-like reactors to enhance wastewater biodegradability.</p>

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Regulating nonradicals generation through peroxymonosulfate activation via localized dipole to enhance wastewater biodegradability

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Zhiyong Zhao,
  • Gaohua Yang,
  • Pengfei Wang,
  • Shuai Yue,
  • Mengxue Yang,
  • Tao Zhang,
  • Sihui Zhan

摘要

It is still greatly desirable to activate peroxymonosulfate (PMS) forming nonradicals for the removal of electron-rich contaminants in complex water matrices. However, achieving this on heterogeneous metal-based catalysts with uniform electron distribution remains challenging due to the asymmetric structure of PMS molecules (H-O-O-SO3-). Here, inspired by the dipole effect, we design a Co-doped ZnO catalyst (ZOC) to break charge symmetry at active sites and enhance nonradicals generation. The high charge density at Co sites facilitates two-electron transfer, promoting O-O and O-H bond cleavage to form high-valent cobalt-oxo (CoIV=O), while positively polarized Zn sites drive PMS self-decomposition to generate singlet oxygen (1O2). As a result, the synergistic system of 1O2 and CoIV = O results in a k-value of 73.93 min⁻¹ M⁻¹ for aniline (AN) degradation, 189.6 times higher than ZnO/PMS (ZO/PMS), and also shows a high selectivity for electron-rich new pollutants. The practicality of this outstanding nonradicals system is confirmed by a significant increase in biochemical oxygen demand/chemical oxygen demand (BOD/COD) of the mixed wastewater to over 0.55 in the air-lifting internal circulating reactor. This study offers a structural regulation for controlling catalytic functionality and provides general guidelines for designing Fenton-like reactors to enhance wastewater biodegradability.