Co-generation of hydroxyl and sulfate radicals via homogeneous and heterogeneous bi-catalysis with the EO-PS-EF tri-coupling system for efficient removal of refractory organic pollutants

Wanlin Yang, Zejun Deng*, Libin Liu, Kechao Zhou, Peisan (Sharel) E, Lingcong Meng, Li Ma, Qiuping Wei

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Advanced oxidation processes are commonly considered one of the most effective techniques to degrade refractory organic pollutants, but the limitation of a single process usually makes it insufficient to achieve the desired treatment. This work introduces, for the first time, a highly-efficient coupled advanced oxidation process, namely Electro-Oxidation—Persulfate—Electro-Fenton (EO-PS-EF). Leveraging the EO-PS-EF tri-coupling system, diverse contaminants can be highly efficiently removed with the help of reactive hydroxyl and sulfate radicals generated via homogeneous and heterogeneous bi-catalysis, as certified by radical quenching and electron spin resonance. Concerning degradation of tetracycline (TC), the EO-PS-EF system witnessed a fast pseudo-first-order reaction kinetic constant of 2.54 × 10−3 s−1, ten times that of a single EO system and three-to-four times that of a binary system (EO-PS or EO-EF). In addition, critical parameters (e.g., electrolyte, pH and temperature) are systematically investigated. Surprisingly, after 100 repetitive trials TC removal can still reach 100% within 30 min and no apparent morphological changes to electrode materials were observed, demonstrating its long-term stability. Finally, its universality was demonstrated with effective degradation of diverse refractory contaminants (i.e., antibiotics, dyes and pesticides).

Original languageEnglish
Article number120312
JournalWater Research
Volume243
Early online date5 Jul 2023
DOIs
Publication statusE-pub ahead of print - 5 Jul 2023

Keywords / Materials (for Non-textual outputs)

  • Application potential
  • Degradation pathway
  • Electro-Oxidation—Persulfate—Electro-Fenton
  • Hydroxyl and sulfate radicals
  • Mechanism

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