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Type: Journal article
Title: Magnetic ZnO@Fe₃O₄ composite for self-generated H₂O₂ toward photo-Fenton-like oxidation of nitrophenol
Other Titles: Magnetic ZnO@Fe(3)O(4) composite for self-generated H(2)O(2) toward photo-Fenton-like oxidation of nitrophenol
Author: Liu, Q.
Zhou, L.
Liu, L.
Li, J.
Wang, S.
Znad, H.
Liu, S.
Citation: Composites Part B: Engineering, 2020; 200:108345-1-108345-8
Publisher: Elsevier
Issue Date: 2020
ISSN: 1359-8368
Statement of
Qiaoran Liu, Li Zhou, Lihong Liu, Jiaquan Li, Shaobin Wang, Hussein Znad, Shaomin Liu
Abstract: The present work focuses on the synthesis of a magnetically separable and stable catalyst for self-supplying H₂O₂ in photo-Fenton degradation of p-nitrophenol. Different from the most popular Fe₃O₄@ZnO core-shell structure, ZnO microflower cores were partially wrapped with Fe₃O₄ nanoparticles via a layer-by-layer self-assembly process. Several characterisation techniques were employed to investigate the crystal structure, morphology, surface chemistry and optical properties of the produced composites. The band gaps of the ZnO and Fe₃O₄ were considerably decreased from 3.05 to 2.60 to 2.35 eV after the assembly. The optimum Fe₃O₄ deposition layer number was found to be 5 for achieving 100% p-nitrophenol removal in 60 min. The degradation was triggered with in-situ photocatalytic formation of hydrogen peroxide over Fe₃O₄@ZnO. The exposed Fe₃O₄ nanoparticles provided Fe²⁺ and Fe³⁺ Fenton-active species for stable operation. We explored possible mechanisms of the enhanced photocatalysis by quenching and radical trapping experiments. The magnetic separation was also performed to recover and reuse the spent catalyst.
Keywords: Self-generated H₂O₂; ZnO microflower; Fe₃O₄ nanoparticle; photo-fenton catalyst; nitrophenol degradation
Rights: © 2020 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.compositesb.2020.108345
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Chemical Engineering publications

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