Experimental Design Methodology Applied to the Oxidation of Quinolines in Aqueous Medium by Electro-Fenton Process

Authors

SOUISSI Souhaila TRABELSI, Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), UPEMLV, 77454 Marne-la-Vallée, France;Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire 2092, El Manar Tunis, Tunisia;
Nihal OTURAN, Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), UPEMLV, 77454 Marne-la-Vallée, France;
Nizar BELLAKHAL, Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, Campus Universitaire 2092, El Manar Tunis, Tunisia;Département de Génie Chimique et Biologique Institut National des Sciences Appliquées et de Technologie 1080 Tunis, Tunisia;
Mehmet A. OTURAN, Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), UPEMLV, 77454 Marne-la-Vallée, France;Follow

Corresponding Author

Mehmet A. OTURAN(mehmet.oturan@univ-paris-est.fr)

Abstract

The degradation behavior of 8-hydroxyquinoleine sulfate (8-HQS), a model molecule of quinolines, was studied in an aqueous medium by electro-Fenton process using a carbon felt cathode and a platinum anode. The great oxidation ability of this process is due to a large production of hydroxyl radical (OH) by electrochemically induced Fenton’s reagent (H2O2, Fe2+). Hydroxyl radicals are very powerful oxidizing agents which react on organics up to complete mineralization. A factorial experimental design was used for determining the operating parameters on the degradation of 8-HQS in an aqueous medium. The results showed that the current intensity and the initial concentration of 8-HQS were the main factors that influenced the degradation rate. The decay in concentration of 8-HQS with the electrolysis time shows that the oxidation of 8-HQS follows pseudo-first order kinetics. The absolute rate constant for the oxidation of 8-HQS by OH was determined by using competition kinetics method and found to be 1.62×109 mol^-1·L·s^-1. The optimal experimental parameters for the mineralization of 8-HQS have also been investigated by the use of Doehlert matrix. It has been demonstrated that under the optimal conditions determined by this method, electro-Fenton process can lead to a quasi-complete mineralization (95% of TOC removal) of 8-HQS aqueous solution. The treatment of 8-HQS aqueous solutions leads to the formation of short-chain carboxylic acids as end-products before mineralization. Their evolution during electro-Fenton treatment was studied. The follow-up of the solution toxicity evolution shows the formation of intermediates more toxic than 8-HQS. However, the solution toxicity was totally removed after mineralization of these intermediates.

Graphical Abstract

Keywords

8-HQS, electro-Fenton process, hydroxyl radicals, degradation, Doehlert matrix, mineralization, toxicity

DOI Link

https://doi.org/10.61558/2993-074X.2137

Publication Date

2013-10-28

Online Available Date

2013-03-12

Revised Date

2013-03-12

Received Date

2012-12-25

Recommended Citation

SOUISSI Souhaila TRABELSI, Nihal OTURAN, Nizar BELLAKHAL, Mehmet A. OTURAN. Experimental Design Methodology Applied to the Oxidation of Quinolines in Aqueous Medium by Electro-Fenton Process[J]. Journal of Electrochemistry, 2013 , 19(5): 460-471.
DOI: 10.61558/2993-074X.2137
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss5/10

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