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Experimental and modeling evidence of hydroxyl radical production in iron electrocoagulation as a new mechanism for contaminant transformation in bicarbonate electrolyte
Shiwei Xie; Chang Li; Peng Liao; Jingfu Wang; Jingan Chen; Ao Qian; Yan Zhang; Taoyuan Wei; Dong Cheng; Mengqi Jia
2022
Source PublicationWater Research
Volume220Pages:118662
Abstract

Iron electrocoagulation is designed for sustainable high-efficiency and high-flexibility water purification applications. Recent advances reported that hydroxyl radicals (•OH)-based oxidative transformation of organic contaminants can occur in iron electrocoagulation. However, there is still a lack of mechanistic understanding the production of •OH in bicarbonate electrolyte, which presents a critical knowledge gap in the optimization of iron electrocoagulation technology towards practical application. Combined with contaminant degradation, radical quenching experiments, and spectroscopic techniques, we found that •OH was produced at rate of 16.1 μM∙h  1 during 30-mA iron electrocoagulation in bicarbonate electrolyte through activation of O2 by Fe(II) under pH-neutral conditions. High yield of •OH occurred at pH 8.5, likely due to high adsorbed Fe(II) that can activate O2 to enhance •OH production. Mössbauer and X-ray photoelectron spectroscopy measurements substantiated that Fe(II)-adsorbed lepidocrocite was the dominant solid Fe(II) species at pH 8.5. A process-based kinetic modeling was developed to describe the dynamic of •OH production, Fe(II) oxidation, and contaminant degradation processes in iron electrocoagulation. Findings of this study extend the functionality of electrocoagulation from phase separation to •OH-based advanced oxidation process, which provides a new perspective for the development of electrocoagulation-based next generation sustainable water purification technology.

KeywordIron Electrocoagulation Hydroxyl Radical Adsorbed Fe(Ii) Oxidation Kinetic Modeling Bicarbonate
DOI10.1016/j.watres.2022.118662
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Indexed BySCI
Language英语
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13513
Collection环境地球化学国家重点实验室
Affiliation1.School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
3.State Key Lab of Biogeology and Environmental Geology, China University of Geosciences, No. 68 Jincheng Street, East Lake High-Tech Development Zone, Wuhan, Hubei 430078, China
4.Department of Earth, Ocean and Atmospheric Sciences, The University of British Columbia, 2207 Main Mall, Vancouver, BC V6T 1Z4, Canada
Recommended Citation
GB/T 7714
Shiwei Xie,Chang Li,Peng Liao,et al. Experimental and modeling evidence of hydroxyl radical production in iron electrocoagulation as a new mechanism for contaminant transformation in bicarbonate electrolyte[J]. Water Research,2022,220:118662.
APA Shiwei Xie.,Chang Li.,Peng Liao.,Jingfu Wang.,Jingan Chen.,...&Mengqi Jia.(2022).Experimental and modeling evidence of hydroxyl radical production in iron electrocoagulation as a new mechanism for contaminant transformation in bicarbonate electrolyte.Water Research,220,118662.
MLA Shiwei Xie,et al."Experimental and modeling evidence of hydroxyl radical production in iron electrocoagulation as a new mechanism for contaminant transformation in bicarbonate electrolyte".Water Research 220(2022):118662.
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