Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 725, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.138299
Keywords
Sewage sludge; Fe-rich biochar; Multivalent iron compounds; Fenton catalyst; 4-Chlorophenol degradation
Categories
Funding
- National Science Foundation of China [U1901216]
- Wuhan Sanzhen Industrial Holding Co., Ltd.
- National Science Foundation of Guangdong Province [U1901216]
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Fe-rich biochar with multivalent iron compounds (Fe-0, 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 Fe-0 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. (C) 2020 Elsevier B.V. All rights reserved.
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