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2023-04-19

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cc-by-nc-nd (c) Elsevier B.V., 2023
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/199403

New insights into the mechanism of Fered-Fenton treatment of industrial wastewater with high chloride content: Role of multiple reactive species

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https://doi.org/10.1016/j.scitotenv.2023.163596

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.

Subject

Clorurs, Electroquímica, Contaminants

Subject (English)

Chlorides, Electrochemistry, Pollutants

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Articles publicats en revistes (Ciència dels Materials i Química Física)

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CHEN, Zehong, et al. New insights into the mechanism of Fered-Fenton treatment of industrial wastewater with high chloride content: Role of multiple reactive species. Science of the Total Environment. 2023. Vol. 882, num. 163596. ISSN 0048-9697. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/199403

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