Visible-light-driven photo-Fenton oxidation enhanced by Fe/Bi-nanocrystal phase transformation as a universal way for various organic pollutants mineralization

Tulai Sun, Zi Yan Jin, Bin Deng, Gan He, Qiong Yu Wang, Mian Hu, Zhangliang Han, Zhaoke Zheng, Jun Zhao, Jimmy Yun*, Jia Zhao, Yihan Zhu, Zhiyan Pan, Xiaonian Li, Zhong Ting Hu*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

1 Citation (Scopus)

Abstract

Emerging organic pollutants (EOPs), such as azoxystrobin (AZX) fungicide, have been an increasingly serious problem in aquatic environments. Here, a novel Fe/Bi-nanocrystal (bismuth ferrite polymorphism composites, BFPCs) driven a new photo-Fenton system in visible light (λ >420 nm) irradiation (LED/BFPCs/H2O2) remarkably accelerates hydroxyl radical (HO) formation with excellent efficiencies of both AZX and other 18 EOPs (especially for AZX 100 % degradation rarely reported). The system outperforms in mineralization rate, saving H2O2 usage (85 %) and reaction time (50 %) compared to the alike Fenton-like system. A phenomenon in BFPCs crystal structure observed on the crystal phase transformation from FeO6 octahedron into FeO4 tetrahedron that implied/uncovered a new finding of crystal-phase restructuring for enhancing Fe3+/Fe2+ circulation in Fenton chemistry. The stability of crystal structure and chemical composition of BFPCs catalysts was evaluated by HAADF imaging coupling with EDX mapping at atomic level. The mechanism on AZX degradation pathway in LED/BFPCs/H2O2 system is proposed for the first time by monitoring HO and its source, and intermediates at a control condition.

Original languageEnglish
Article number148732
JournalChemical Engineering Journal
Volume481
Early online date13 Jan 2023
DOIs
Publication statusPublished - 1 Feb 2024

Scopus Subject Areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

User-Defined Keywords

  • Azoxystrobin
  • Iron circulation
  • Phase-transfer catalysis
  • Photo-fenton oxidation

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