Peroxide activation by microbially synthesized sulfidated iron: Comparison against abiotic iron-based materials in terms of treatment efficiency and oxidative degradation pathway

Bowen Yang, Sae In Suh, Jeonggil Lee, Hwa Soo Ryoo, So Young Ham, Jaesung Kim, Young Jin Ko, Heesoo Woo, Jaemin Choi, Hyung Suk Oh, Sang Hoon Lee, Hee Deung Park, Man Jae Kwon, Hongshin Lee, Jaesang Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

This study demonstrated the application of biogenic sulfidated iron (B-FeS), produced via anaerobic digestion of Desulfovibrio desulfuricans using sulfate as the terminal electron acceptor, for peroxide activation. B-FeS was assessed against chemically prepared zerovalent and sulfidated iron (ferrous sulfide and pyrite) with respect to their ability to activate peroxydisulfate (PDS) and H2O2. Regardless of the peroxide type, B-FeS outperformed benchmark iron activators in treating 4-chlorophenol due to its resistance to iron corrosion and the high content of reduced sulfur. The roles of oxidizing radicals were confirmed based on the effects of alcohol-based quenchers, multi-activity assessment, electron paramagnetic resonance spectral features, and product analysis. The pH-dependent efficiency of sulfoxide-to-sulfone conversion suggested that high-valent iron species acted as the secondary oxidant in all iron/peroxide systems, and the contribution was more pronounced when PDS and B-FeS were used. Microbial sulfidation as a catalyst regeneration strategy recovered the peroxide activation capacity of oxidized B-FeS.

Original languageEnglish
Article number120884
JournalApplied Catalysis B: Environmental
Volume303
DOIs
Publication statusPublished - 2022 Apr

Keywords

  • Biogenic sulfidated iron
  • High-valent iron
  • Peroxide activation
  • Sulfate radical
  • Sulfate-reducing bacteria

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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