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Article Dans Une Revue Journal of Hazardous Materials Année : 2023

Dithionite accelerated copper slag heterogeneous-homogeneous coupled Fenton degradation of organic pollutants

Résumé

The heterogeneous-homogeneous coupled Fenton (HHCF) processes combine the advantages of rapid reaction and the catalyst reuse, which makes them attractive for wastewater treatment. Nevertheless, the lack of both, cost-effective catalysts and the desirable Fe3+/Fe2+ conversion mediators limit the development of HHCF processes. This study investigates a prospective HHCF process, in which solid waste copper slag (CS) and dithionite (DNT) act as catalyst and mediator of Fe3+/Fe2+ transformation, respectively. DNT enables controlled leaching of iron and a highly efficient homogeneous Fe3+/Fe2+ cycle by dissociating to SO2− • under acidic conditions, leading to the enhanced H2O2 decomposition and •OH generation (from 48 μmol/L to 399 μmol/L) for p-chloroaniline (p-CA) degradation. The removal rate of p-CA in the CS/DNT/H2O2 system increased by 30 times in comparison with the CS/H2O2 system (increased from 1.21 × 10-3 min-1 to 3.61 × 10-2 min-1). Moreover, batch dosing of H2O2 can greatly promote the yield of •OH (from 399 μmol/L to 627 μmol/L), by mitigating the side reactions between H2O2 and SO2− •. This study highlights the importance of the iron cycle regulation for improvement of the Fenton efficiency and develops a cost-effective Fenton system for organic contaminants elimination in wastewater
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Dates et versions

hal-04140944 , version 1 (26-06-2023)

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Bo Ma, Jun Yao, Tatjana Šolević Knudsen, Wancheng Pang, Bang Liu, et al.. Dithionite accelerated copper slag heterogeneous-homogeneous coupled Fenton degradation of organic pollutants. Journal of Hazardous Materials, 2023, 457, pp.131797. ⟨10.1016/j.jhazmat.2023.131797⟩. ⟨hal-04140944⟩
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