Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 303, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120884
Keywords
Biogenic sulfidated iron; Sulfate-reducing bacteria; Peroxide activation; Sulfate radical; High-valent iron
Funding
- National Research Foundation of Korea - Korean government [NRF-2021R1A2C2003763]
- Korea Ministry of Environment [RE202101610]
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This study demonstrated the superior performance of biogenic sulfidated iron (B-FeS) produced via anaerobic digestion of Desulfovibrio desulfuricans in activating peroxides compared to chemically prepared iron activators. The presence of high-valent iron species in all iron/peroxide systems acted as a secondary oxidant, with a more pronounced contribution when using PDS and B-FeS. Microbial sulfidation as a catalyst regeneration strategy effectively recovered the peroxide activation capacity of oxidized B-FeS.
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 pHdependent 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.
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