Comparison of homogeneous and heterogeneous electrochemical advanced oxidation processes for treatment of textile industry wastewater

Hien, Sié Alain; Trellu, Clément; Oturan, Nihal; Assémian, Alain Stéphane; Briton, Bi Gouessé Henri; Drogui, Patrick; Adouby, Kopoin; Oturan, Mehmet A.

doi:10.1016/j.jhazmat.2022.129326

Cited by 29 publications

(5 citation statements)

References 52 publications

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“…The formation of ClO 4 – during the electrochemical oxidation of chlorinated wastewater is a long-standing problem. , However, previous studies implied that the Pt electrode used in this study may have certain advantages in treating wastewater containing chlorine compared to the widely acclaimed BDD electrode in the degradation of PFOA, as Pt forms lower concentrations of ClO 4 – byproducts compared to BDD. − However, if the removal efficiency of PFOA is emphasized, BDD electrode is undoubtedly a better choice than Pt electrode, because BDD electrode has better removal efficiency of PFOA than Pt, even that the presence of Cl – can inhibit the degradation of PFOA by BDD electrode. In summary, further evaluation is needed on the economic and environmental benefits of PFOA degradation systems involving active chlorine.…”

Section: Resultsmentioning

confidence: 92%

Degradation of Perfluorooctanoic Acid by Chlorine Radical Triggered Electrochemical Oxidation System

Song

Qiao

Wang

et al. 2023

Environ. Sci. Technol.

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Electrochemical oxidation (EO) has been shown to have the unique ability to degrade perfluorooctanoic acid (PFOA), although the radical chemistry involved in this degradation is unclear, particularly in the presence of chloride ions (Cl − ). In this study, reaction kinetics, free radical quenching, electron spin resonance, and radical probes were used to examine the roles of •OH and reactive chlorine species (RCS, including Cl•, Cl 2•− , and ClO•) in the EO of PFOA. Using EO in the presence of NaCl, PFOA degradation rates of 89.4%−94.9% and defluorination rates of 38.7%−44.1% were achieved after 480 min with PFOA concentrations ranging from 2.4 to 240 μM. The degradation occurred via the synergistic effect of •OH and Cl• rather than through direct anodic oxidation. The degradation products and density functional theory (DFT) calculations revealed that Cl• triggered the first step of the reaction, thus the initial direct electron transfer was not the rate-limiting step of PFOA degradation. The change in Gibbs free energy of the reaction caused by Cl• was 65.57 kJ mol −1 , which was more than two times lower than that triggered by •OH. However, •OH was involved in the subsequent degradation of PFOA. The synergistic effect of Cl• and •OH in PFOA degradation is demonstrated for the first time in this study, which is promising for the development of electrochemical technology to remove perfluorinated alkyl substances from the environment.

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Section: Resultsmentioning

confidence: 92%

Degradation of Perfluorooctanoic Acid by Chlorine Radical Triggered Electrochemical Oxidation System

Song

Qiao

Wang

et al. 2023

Environ. Sci. Technol.

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“…7c), TOC removal efficiency was diminished for treatment of SWE. The decrease in mineralization efficiency during the treatment of SWE can be explained by (i) the presence of natural organic matter in SWE which could scavenge hydroxyl radicals that reduce the amount of • OH available for oxidation of OFLO and (ii) consumption of • OH in reactions with inorganic ions such as Cland HCO3present in SWE, with generation of less reactive radicals such as ClOH •and CO3 •- [23], [40].…”

Section: Synergistic Effects Of • Oh and Bdd( • Oh) On Oxidation Of Oflomentioning

confidence: 99%

“…The contribution of M( • OH) to EF process is strongly related to the nature of anode material, as well as in the overall performance of AO [23]. Anodes characterized with high O2-evolution overpotential are regarded as "non-active" anodes, while those with low O2-evolution overpotential are of the "active anodes" type.…”

Section: Introductionmentioning

confidence: 99%

Synergistic mineralization of ofloxacin in electro-Fenton process with BDD anode: Reactivity and mechanism

Yang

Oturan

Liang

et al. 2023

Separation and Purification Technology

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“…Electrochemical degradation has been widely investigated based on the oxidation of pollutants by hydroxy radical (OH•) generated, which has been applied in the treatment of textile effluent [11]. So far, tank electrolyzers have been widely used in then the treatment of textile effluent [12]. The tube electrolyzer with high mass transfer efficiency and compact structure is regarded as a potential electrolyzer type for the electrochemical degradation [13].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Degradation of Textile Effluent Using PbO2 Electrode in Tube Electrolyzer

Wang,

Li,

Wan

et al. 2024

J. Electrochem. Sci. Technol

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A commercial PbO2 mesh cylinder electrode was utilized as the anode for the electrochemical degradation of the textile effluent after the biological treatment with the titanium cylinder as the cathode in a self-made tube electrolyzer. The electrochemical performances of the PbO2 electrode in tube electrolyzer under different initial pH, electrolyte flow rates, current densities and times of the electrochemical degradation were investigated. The experimental results illustrated that the PbO2 electrode can reduce the chemical oxygen demand (COD) of the textile effluent from 94.0 mg L−1 to 65.0 mg L−1 with the current efficiency of 88.3%, the energy consumption of 27.7 kWh kg−1 (per kilogram of degraded COD) and the carbon emissions of 18.0 kg CO2 kg−1 (per kilogram of degraded COD) under the optimal operating conditions. In addition, the COD of the textile effluent could be reduced from 94.0 mg L−1 to 22.0 mg L−1 after the fifth electrochemical degradation. Therefore, PbO2 mesh cylinder electrode in the tube cylinder was promising for the electrochemical degradation of the textile effluent.

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Comparison of homogeneous and heterogeneous electrochemical advanced oxidation processes for treatment of textile industry wastewater

Cited by 29 publications

References 52 publications

Degradation of Perfluorooctanoic Acid by Chlorine Radical Triggered Electrochemical Oxidation System

Degradation of Perfluorooctanoic Acid by Chlorine Radical Triggered Electrochemical Oxidation System

Synergistic mineralization of ofloxacin in electro-Fenton process with BDD anode: Reactivity and mechanism

Electrochemical Degradation of Textile Effluent Using PbO2 Electrode in Tube Electrolyzer

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