Enhanced reductive debromination and subsequent oxidative ring-opening of decabromodiphenyl ether by integrated catalyst of nZVI supported on magnetic Fe₃O₄ nanoparticles

Lei TAN, Shaoyou LU, Zhanqiang FANG, Wan CHENG, Po Keung Eric TSANG

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35 Citations (Scopus)

Abstract

The magnetic Fe⁰@Fe₃O₄ nanocomposite was prepared and used to achieve the reductive/subsequent oxidative ring-opening of decabromodiphenyl ether (BDE209) in this work. The characterization results indicated that the structure of the composite consisted of small nanoscale zero-valent iron (nZVI) particles surrounding the surface of Fe₃O₄ nanoparticle (NP). A 100% removal efficiency and 80% degradation efficiency of BDE209 was reached by the composite accompanied with ultrasound(called NP/US system) for 36 h, which is higher than that obtained with conventional nZVI particles. Furthermore, the enhanced debromination and ring-opening of BDE209 was realized by a Fenton-like degradation process lasting for 12 h after the addition of H₂O₂ to the NP/US reaction at 36 h. Based on the degradation products identified, a two-stage reduction/oxidation degradation mechanism was proposed. During the first stage, which was reductive debromination, the major reductive activity of nZVI was efficiently enhanced in the presence of nano Fe₃O₄, which served as a catalyst to improve the stability of the nZVI nanoparticles and accelerate electron transfer, enhancing the degradation efficiency of BDE209. During the second stage, the oxidative ring-opening, the debromination products of BDE209 were proved to be attacked by abundant hydroxyl radicals generated both in the solution and on the surface of the Fe⁰@Fe₃O₄ nanoparticles. Thus, this work provides an efficient method to achieve the complete ring-opening of PBDEs using iron-based nanomaterials. Copyright © 2016 Elsevier B.V.
Original languageEnglish
Pages (from-to)200-210
JournalApplied Catalysis B: Environmental
Volume200
Early online dateJul 2016
DOIs
Publication statusPublished - Jan 2017

Fingerprint

decabromobiphenyl ether
ether
Ethers
Iron
catalyst
Nanoparticles
Degradation
Catalysts
degradation
Halogenated Diphenyl Ethers
PBDE
Composite materials
hydroxyl radical
Nanostructured materials
Hydroxyl Radical
Nanocomposites
Ultrasonics
iron nanoparticle
nanoparticle
iron

Citation

Tan, L., Lu, S., Fang, Z., Cheng, W., & Tsang, E. P. (2017). Enhanced reductive debromination and subsequent oxidative ring-opening of decabromodiphenyl ether by integrated catalyst of nZVI supported on magnetic Fe₃O₄ nanoparticles, Applied Catalysis B: Environmental, 200, 200-210.

Keywords

  • Decabromodiphenyl ether (BDE209)
  • Fe⁰⁰@Fe₃O₄ nanoparticles
  • Ring-opening
  • Two stage
  • Mechanism