Effect of cathode material on electro-Fenton process efficiency for electrocatalytic mineralization of the antibiotic sulfamethazine

Sopaj, Flamur; Oturan, Nihal; Pinson, Jean; Podvorica, Fetah I.; Oturan, Mehmet A.

doi:10.1016/j.cej.2019.123249

Cited by 103 publications

(25 citation statements)

References 44 publications

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“…It was compared to the large CF (80 cm 2 ) since this later cathode was employed in our previous studies. Regarding the CS45 cathode, the porosity of 45 ppi was found as the most appropriate porosity in a previous study of our group [27] …”

Section: Resultsmentioning

confidence: 70%

“…As can be seen from the results shown in Figure 1, SS and Ti cathodes produce a negligible amount of H 2 O 2 . CS45 behaves as the best cathode compared to other carbonaceous materials due to its favorable porosity and larger active surface area [27] . CG achieved lower H 2 O 2 generation efficiency due to its plate surface leading to lower electro‐active surface area.…”

Section: Resultsmentioning

confidence: 99%

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Comparative Performance of Ten Electrodes in Electro‐Fenton Process for Removal of Organic Pollutants from Water

2021

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Electrochemical advanced oxidation processes (EAOPs), based on the in situ generation of the powerful oxidant, hydroxyl radical (.OH), have been developed for effective destruction of recalcitrant organic pollutants. Electrode materials used both as anode and cathode constitute one of the key parameters affecting the process efficiency. The electro‐Fenton (EF) process is one of the most powerful EAOPs in water/wastewater treatment. Inversely to other EAOPs, in the EF process, .OH can be generated both in the bulk solution (from reagents formed at the cathode) and on anode surface. Therefore, the role of anode/cathode couple is of great importance for this process. This study focuses on the comparative performance of ten electrodes (5 anodes, 5 cathodes) through more than fifty combinations during removal of the antibiotic p‐aminosalicylic acid (p‐ASA), taken as target pollutant. The following parameters were chosen for performance assessment: oxidative degradation kinetics, the time needed for complete destruction of p‐ASA, mineralization rate, mineralization current efficiency and energy consumption. The results obtained highlight the following sequence for the performance of anodes: BDD > PbO2 > Ti4O7 > Pt≈DSA, and that of cathodes: carbon sponge ≥ carbon felt > graphite > stainless steel≈titanium.

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Section: Resultsmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Comparative Performance of Ten Electrodes in Electro‐Fenton Process for Removal of Organic Pollutants from Water

2021

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“…When the spacing between the plates was 1 cm, the anode and cathode were too close to each other, so the •OH and other strong oxidizing intermediate products produced by Fenton reagent were directly reduced at the cathode, without enough time to oxidize the targeted organic pollutants [37]. At the same time, if the distance between plates was too small, the bubbles generated during electrolysis could cause the fluctuation of water samples, making the distribution of pollutants uneven, affecting the stability of the treatment efficiency, and may cause the breakdown of the setup, between plates and could cause damage to the electrode material and circuit [38].…”

Section: Effect Of the Electrode Gapmentioning

confidence: 99%

Process optimization and mechanism study of acid red G degradation by electro-Fenton- Feox process as an in situ generation of H2O2

Sun¹,

Yao²,

Wei³

et al. 2021

Turk J Chem

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Dye contaminated wastewaters are industrial wastewaters that are difficult to be treated using traditional biochemical and physicochemical methods. In the present work, the acid red G was removed as a model pollutant by the Electro-Fenton Process for the first time. The anode and cathode used by the Electro-Fenton Process were iron plate and graphite felt, respectively. Optimizing the process, it was concluded that under the conditions of current density= 20 mA cm-2 , pH= 3 and initial Na2SO4 concentration= 0.2 M, the removal rate of acid red G with an initial concentration of 300 mg L-1 could reach 94.05% after 80 min of electrolysis. This reveals that the EF-Feox Process used in this work has an excellent removal efficiency on acid red G. The required reagents (Fe 2+ , H2O2) were generated by the electrode reaction, while the optimal generation conditions and mechanism of •OH, H2O2 and Fe 2+ were investigated. By testing •OH, H2O2, and Fe 2+ agents at different pH and current densities, it was revealed that the Electro-Fenton reaction was most efficient when the current density was 20 mA cm-2, and the pH was 3. Moreover, the removal rate of ARG is consistent with first-order reaction kinetics.

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“…•-), with strong oxidizing power [10]. The organic substances which are difficult to degrade, can be oxidized into a low-toxic or non-toxic small molecule substance, and very often more readily (bio-)degradable, [4,[11][12][13][14][15]. Due to its green environmentally friendly sustainable properties, the photocatalytic oxidation became one of the best promising techniques in treating organic wastewater.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the photocatalytic activity of decatungstate, W10O324−, for the oxidation of sulfasalazine/sulfapyridine in the presence of hydrogen peroxide

Cheng¹,

Wang²,

Sarakha³

et al. 2021

Journal of Photochemistry and Photobiology A: Chemistry

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The degradations of sulfasalazine and also sulfapyridine have been investigated by using the sodium decatungstate Na 4 W 10 O 32 as a photocatalyst in the presence of hydrogen peroxide as a sacrifial agent. The selective irradiation of decatungstate, W 10 O 32 4-, in the presence of the pollutants at 365 nm and at pH = 4.0 leads to the reduction of hydrogen peroxide via a Fenton like reaction involving the reduced species, W 10 O 32 5-. Such process represents an efficient way for the formation of the highly reactive species, namely the hydroxyl radicals. The process appears then to be highly efficient for the oxidation of the pollutants sulfasalazine and sulfapyridine. Under our experimental conditions, the process was optimized in terms of concentrations of the photocatalyst, hydrogen peroxide and pollutant concentrations and also in term of pH. For both pollutants, the analysis of the generated by-products, using HPLC/MS, shows that the degradation proceeds primarily through three and common chemical processes: i) hydroxylation ii) desulfurization and iii) scission at the azo group-N=N-. The attack of the hydroxyl radical is clearly the main species for the degradation processes. As clearly demonstrated by the TOC experiments, the combination of W 10 O 32 4-/H 2 O 2 /h system permitted a total mineralization of the solution indicating its high efficiency for the a potential application of water depollution.

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Effect of cathode material on electro-Fenton process efficiency for electrocatalytic mineralization of the antibiotic sulfamethazine

Cited by 103 publications

References 44 publications

Comparative Performance of Ten Electrodes in Electro‐Fenton Process for Removal of Organic Pollutants from Water

Comparative Performance of Ten Electrodes in Electro‐Fenton Process for Removal of Organic Pollutants from Water

Process optimization and mechanism study of acid red G degradation by electro-Fenton- Feox process as an in situ generation of H2O2

Enhancement of the photocatalytic activity of decatungstate, W10O324−, for the oxidation of sulfasalazine/sulfapyridine in the presence of hydrogen peroxide

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