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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2020, Vol. 14 Issue (5) : 82     https://doi.org/10.1007/s11783-020-1261-x
REVIEW ARTICLE
Dual-reaction-center catalytic process continues Fenton’s story
Chao Lu, Kanglan Deng, Chun Hu, Lai Lyu()
Institute of Environmental Research at Greater Bay Area, Key Laboratory for Water Quality and Conservation of the Pearl River Delta (Ministry of Education), Guangzhou University, Guangzhou 510006, China
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Abstract

• Dual-reaction-center (DRC) system breaks through bottleneck of Fenton reaction.

• Utilization of intrinsic electrons of pollutants is realized in DRC system.

• DRC catalytic process well continues Fenton’s story.

Triggered by global water quality safety issues, the research on wastewater treatment and water purification technology has been greatly developed in recent years. The Fenton technology is particularly powerful due to the rapid attack on pollutants by the generated hydroxyl radicals (•OH). However, both heterogeneous and homogeneous Fenton/Fenton-like technologies follow the classical reaction mechanism, which depends on the oxidation and reduction of the transition metal ions at single sites. So even after a century of development, this reaction still suffers from its inherent bottlenecks in practical application. In recent years, our group has been focusing on studying a novel heterogeneous Fenton catalytic process, and we developed the dual-reaction-center (DRC) system for the first time. In the DRC system, H2O2 and O2 can be efficiently reduced to reactive oxygen species (ROS) in electron-rich centers, while pollutants are captured and oxidized by the electron-deficient centers. The obtained electrons from pollutants are diverted to the electron-rich centers through bonding bridges. This process breaks through the classic Fenton mechanism, and improves the performance and efficiency of pollutant removal in a wide pH range. Here, we provide a brief overview of Fenton’s story and focus on combing the discovery and development of the DRC technology and mechanism in recent years. The construction of the DRC and its performance in the pollutant degradation and interfacial reaction process are described in detail. We look forward to bringing a new perspective to continue Fenton’s story through research and development of DRC technology.

Keywords Dual reaction centers      Fenton      Pollutant utilization      Electron transfer     
This article is part of themed collection: Accounts of Aquatic Chemistry and Technology Research (Responsible Editors: Jinyong Liu, Haoran Wei & Yin Wang)
Corresponding Author(s): Lai Lyu   
Issue Date: 19 May 2020
 Cite this article:   
Chao Lu,Kanglan Deng,Chun Hu, et al. Dual-reaction-center catalytic process continues Fenton’s story[J]. Front. Environ. Sci. Eng., 2020, 14(5): 82.
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http://journal.hep.com.cn/fese/EN/10.1007/s11783-020-1261-x
http://journal.hep.com.cn/fese/EN/Y2020/V14/I5/82
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Chao Lu
Kanglan Deng
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Lai Lyu
Fig.1  Reaction mechanism of the classical homogeneous Fenton process.
Fig.2  s-Cu2+-ligand (pollutants)-associated promotion mechanism of heterogeneous Fenton-like reaction.
Fig.3  The Fenton-like reaction mechanism on the surface galvanic-like cells of d-TiCuAl-SiO2 Ns.
Fig.4  Structure of OH-CCN/CuCo-Al2O3 and two-dimensional valence-electron density color-filled maps of Cu-O-C on OH-CCN/CuCo-Al2O3 (Lyu et al. (2017), with permission of Royal Society of Chemistry).
Fig.5  BMPO spin-trapping EPR spectra for (a) HO2•/O2- and (b) •OH in various methanol dispersions without H2O2 (Lyu et al. (2017), with permission of Royal Society of Chemistry).
Fig.6  DRC mechanism in the OH-CCN/CuCo-Al2O3 Fenton-like system.
Fig.7  (a) BPA degradation curves in various suspensions with H2O2 (Insert shows the corresponding kinetic curves); (b) H2O2 decomposition curves during BPA degradation in CuAlO2 and CN-Cu(II)-CuAlO2 suspensions. Reaction conditions: Natural initial pH, pollutant 25 mg/L, catalyst 1.0 g/L, H2O2 0.01 mol/L (Reprinted with permission from Lyu et al. (2018a). Copyright 2018 American Chemical Society).
Fig.8  DRC mechanism in the CN-Cu(II)-CuAlO2 Fenton-like system.
Fig.9  DRC mechanism in the metal-free POP-rGO NSs Fenton-like system.
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