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Title: | New insights into the mechanism of Fered-Fenton treatment of industrial wastewater with high chloride content: Role of multiple reactive species |
Author: | Chen, Zehong Xia, Pan Wang, Dazhi Niu, Xiaodong Ao, Lixin He, Qiang Wang, Sha Ye, Zhihong Sirés Sadornil, Ignacio |
Keywords: | Clorurs Electroquímica Contaminants Chlorides Electrochemistry Pollutants |
Issue Date: | 19-Apr-2023 |
Publisher: | Elsevier B.V. |
Abstract: | Hydroxyl radical (¿OH) is considered the dominant reactive species in the electro-Fenton (EF) and Fered-Fenton (EFFere) processes for wastewater treatment. However, in chloride-rich media, this is arguable due to the obscure mechanisms for the oxidant speciation and pollutant degradation. Herein, the role of active chlorine and Fe(IV)-oxo species (FeIVO2+) as primary oxidizing agents in HClO-mediated Fered-Fenton (EF-Fere-HClO) process is discussed, along with the dependence of their contribution on the pollutant structure. HClO generated from anodic oxidation of Cl− can be consumed by added H2O2 to form singlet oxygen (1O2), which is detrimental because this species is quickly deactivated by water. The reaction between HClO and Fe2+ was proved to generate FeIVO2+, rather than ¿OH or Cl¿ suggested in the literature. The yield of FeIVO2+ species was proportional to the Cl− concentration and barely affected by solution pH. The long-lived HClO and FeIVO2+ can selectively react with electron-rich compounds, which occurs simultaneously to the non-selective attack of ¿OH formed from Fenton's reaction. The FeIVO2+ and ¿OH concentration profiles were successfully modelled. Although the accumulation of toxic chlorinated by-products from HClO-mediated oxidation might cause newenvironmental concerns, the toxicity of pesticide wastewater with 508mMCl− was halved upon EF-Fere-HClO treatment. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2023.163596 |
It is part of: | Science of the Total Environment, 2023, vol. 882, p. 163596 |
URI: | http://hdl.handle.net/2445/199403 |
Related resource: | https://doi.org/10.1016/j.scitotenv.2023.163596 |
ISSN: | 0048-9697 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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Document embargat fins el 19-4-2025
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