Low-Temperature Reduction Synthesis of γ–Fe2O3−x@biochar Catalysts and Their Combining with Peroxymonosulfate for Quinclorac Degradation

MEi E. Zhong, Gongsong Tong, Jingchun Sun, Nan Zhou, Chunxia Ding, Xiangying Liu, Austin Merchant, Xuguo Zhou

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Biochar loading mixed–phase iron oxide shows great advantages as a promising catalyst owing to its eco–friendliness and low cost. Here, γ–Fe2O3−x@biochar (E/Fe–N–BC) composite was successfully prepared by the sol–gel method combined with low–temperature (280 °C) reduction. The Scanning Electron Microscope (SEM) result indicated that γ–Fe2O3−x particles with the size of approximately 200 nm were well–dispersed on the surface of biochar. The CO derived from biomass pyrolysis is the main reducing component for the generation of Fe (II). The high content of Fe (II) contributed to the excellent catalytic performance of E/Fe–N–BC for quinclorac (QNC) degradation in the presence of peroxymonosulfate (PMS). The removal efficiency of 10 mg/L of QNC was 100% within 30 min using 0.3 g/L γ–Fe2O3−x@biochar catalyst and 0.8 mM PMS. The radical quenching experiments and electron paramagnetic resonance analysis confirmed that •OH and SO4 were the main radicals during the degradation of QNC. The facile and easily mass–production of γ–Fe2O3−x@biochar with high catalytic activity make it a promising catalyst to activate PMS for the removal of organic pollutants.

Original languageEnglish
Article number16790
JournalInternational Journal of Environmental Research and Public Health
Issue number24
StatePublished - Dec 2022

Bibliographical note

Funding Information:
This research was funded by National Natural Science Foundation of China grant number 32172464; the Natural Science Foundation of Hunan Province (2022JJ50042); Innovation and Entrepreneurship Training Program for College Students of Hunan Agricultural University grant number CX20210659.

Publisher Copyright:
© 2022 by the authors.


  • biochar
  • low–temperature reduction
  • peroxymonosulfate
  • quinclorac
  • γ–FeO

ASJC Scopus subject areas

  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis


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