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

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 Micr...

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Bibliographic Details
Published in:International journal of environmental research and public health 2022-12, Vol.19 (24), p.16790
Main Authors: Zhong, Mei-e, Tong, Gongsong, Sun, Jingchun, Zhou, Nan, Ding, Chunxia, Liu, Xiangying, Merchant, Austin, Zhou, Xuguo
Format: Article
Language:English
Subjects:
Biomass
Carbon
Catalysts
Catalytic activity
Charcoal
Degradation
Efficiency
Electron paramagnetic resonance
Electron spin resonance
Ferric oxide
Herbicides
Iron compounds
Iron oxides
Low temperature
Metals
Nitrates
Pollutant removal
Pollutants
Pyrolysis
Scanning electron microscopy
Sodium
Sol-gel processes
Spectrum analysis
Transmission electron microscopy
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Summary: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.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph192416790