Electron-transfer-based peroxymonosulfate activation on defect-rich carbon nanotubes: Understanding the substituent effect on the selective oxidation of phenols

作者：Yu, Shuiping; Peng, Yanhua; Shao, Penghui^*; Wang, Yuanyue; He, Youwen^*; Ren, Wei; Yang, Liming; Shi, Hui; Luo, Xubiao^*

来源：Journal of Hazardous Materials, 2023, 442: 130108.

DOI：10.1016/j.jhazmat.2022.130108

• Peroxymonosulfate activation
• Electron transfer
• Carbon nanotubes
• Substituent effect
• Selective oxidation

Nanocarbon-based persulfate oxidation technologies are promising for green elimination of phenolic pollutants. Previous studies revealed the electron transfer via defective carbon nanotube (CNTs) for selective oxidation of various phenols. However, an underlying relationship between the molecular structure of phenols and the selectivity of electron transfer-induced oxidation has not been well understood. Herein, we report that defect-rich CNTs could initiate electron-transfer regime from phenols to peroxymonosulfate (PMS), resulting in the efficient degradation of phenols. Further studies uncover a distinctive substituent group-dependent selective oxidation of phenols via the CNT-mediated electron transfer process. Specifically, the degradation rate of para-substituted phenols with electron-donating groups (e.g.,-NH2 and-OCH3) is faster than those with electron-withdrawing groups (e.g.,-NO2 and-COOH). For a kind of substituted phenols, the substituent position has a great influ-ence on the phenols degradation and their degradation rates follow this sequence: para > ortho > meta-position.

• 单位
  南昌航空大学