Sludge-derived biochar with multivalent iron as an efficient Fenton catalyst for degradation of 4-Chlorophenol

Quan Gan, Huijie Hou, Sha Liang*, Jingjing Qiu, Shuangyi Tao, Liang Yang, Wenbo Yu, Keke Xiao, Bingchuan Liu, Jingping Hu, Yanfei Wang, Jiakuan Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Scopus citations

Abstract

Fe-rich biochar with multivalent iron compounds (Fe0, Fe0.95C0.05, Fe3O4, and FeAl2O4) pyrolyzed from sludge cake conditioned with Fenton's reagent and red mud was utilized as an efficient Fenton catalyst for the degradation of 4-chlorophenol (4-CP). Effects of pyrolysis temperature and sludge conditioner composition on the transformation of iron compounds were studied. Both homogeneous Fenton reaction initiated by Fe2+ leached from both low-valent Fe0 and Fe0.95C0.05, and heterogeneous Fenton reaction initiated by solid iron phases of Fe3O4 and FeAl2O4 were revealed to contribute to the degradation of 4-CP. The removal efficiency of 4-CP remained 100% after five successive degradation rounds. The homogeneous Fenton reaction mainly works in the first degradation round, and the heterogeneous Fenton reaction dominates in subsequent degradation rounds. The findings of this study suggest that sewage sludge derived Fe-rich biochar could be utilized as an efficient Fenton catalyst for recalcitrant organics degradation.

Original languageEnglish
Article number138299
JournalScience of the Total Environment
Volume725
DOIs
StatePublished - 10 Jul 2020
Externally publishedYes

Keywords

  • 4-Chlorophenol degradation
  • Fe-rich biochar
  • Fenton catalyst
  • Multivalent iron compounds
  • Sewage sludge

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