Influence of the anode material on the degradation of naproxen by Fenton-based electrochemical processes

Coria, Gabriela; Sirés, Ignasi; Brillas, Enric; Nava, José L.

doi:10.1016/j.cej.2016.07.012

Cited by 122 publications

(80 citation statements)

References 45 publications

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“…A maximum accumulated H2O2 concentration of 5.92 ± 0.33 mmol L -1 was obtained at a current of -200 mA after 3 h of electrolysis, as shown in Figure 1(a). According to equation (2), a more negative current is expected to improve the production of H2O2 [34] at the cathode and the production of hydroxyl radicals at the Pt anode (Pt( • OH)) [35,36].…”

Section: Effect Of the Currentmentioning

confidence: 99%

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Lou

Geneste

Soutrel

et al. 2020

Separation and Purification Technology

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This study investigates alachlor herbicide removal by electro-Fenton (EF) process with and without a previous dechlorination step by electro-reduction (ER-EF). The objective is to evaluate the relevance of dechlorination before electro-Fenton according to the biodegradability evolution and the energy consumption. The influence of the applied current, the ferrous ions concentration and the air flow rate on the production of hydrogen peroxide and on the general behavior of alachlor removal by EF oxidation was studied and optimized EF conditions were chosen. Scavenger tests were performed to determine the contribution of hydroxyl radicals (•OH), superoxide radicals (•O2 -) and sulfate radicals ( • SO4 -) during alachlor degradation. Some intermediate products formed during degradation by EF of alachlor and of the electroreduced solution were identified and the evolution of small organic acids was examined. Possible pathways of alachlor degradation and of deschloroalachlor, the mean byproduct from ER, were proposed on the basis of the EF reaction. EF treatment significantly improved the biodegradability of electrolyzed solutions with BOD5/COD ratio increasing from 0 to 0.4 after 0.5 h oxidation and can be further enhanced by the application of ER prior to EF, leading to a maximum value for the BOD5/COD ratio of 0.7 that can be due to the absence of chloroacetic acid found during the EF treatment. The energy consumption of the different electrochemical processes was also evaluated.

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Section: Effect Of the Currentmentioning

confidence: 99%

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Lou

Geneste

Soutrel

et al. 2020

Separation and Purification Technology

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“…A limited number of papers has shown that the influence of the anode (active and non‐active) over the performance of photo‐assisted Fenton‐based EAOPs to degrade organics is small because of the powerful photolytic action of UV radiation ,. This differs from the results found for the AO process, where the non‐active BDD anode presents much greater oxidation ability than the active ones.…”

Section: Introductionmentioning

confidence: 97%

Use of Pt and Boron‐Doped Diamond Anodes in the Electrochemical Advanced Oxidation of Ponceau SS Diazo Dye in Acidic Sulfate Medium

et al. 2017

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The electrochemical degradation of 2.5 L of Ponceau SS diazo dye solution in acidic sulfate medium has been studied in a prepilot flow plant with a boron-doped diamond (BDD)/airdiffusion or Pt/air-diffusion cell connected to an annular photoreactor. The decolorization and mineralization was enhanced in the order: electrochemical oxidation with electrogenerated H 2 O 2 < electro-Fenton < photoelectro-Fenton. The two former methods performed better with the BDD anode, whereas the latter yielded similar results for both anodes. From this, the use of less expensive active anodes such as Ti j Pt instead of nonactive BDD for photo-assisted Fenton-based electrochemical processes is recommended. In all methods, increasing current density led to a greater degradation rate, but with lower mineralization current efficiency and higher energy consumption. Five primary aromatic products and four final carboxylic acids were detected, along with recalcitrant products poorly removed by hydroxyl radicals and UVA radiation.

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“…OH, denoted as BDD( . OH), as compared to other anodes ,,. In contrast, the presence of Cl − ion in the reaction medium complicates the situation because it can be easily oxidized at the BDD anode, giving rise to competing oxidizing agents like active chlorine species (Cl 2 , HClO, and/or ClO − , depending on pH) from Equations (2)–(4) .…”

Section: Introductionmentioning

confidence: 99%

Groundwater Treatment using a Solid Polymer Electrolyte Cell with Mesh Electrodes

et al. 2019

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This article reports the high performance of a solid polymer electrolyte cell, equipped with a Nafion® N117 membrane packed between a Nb/boron-doped diamond (Nb/BDD) mesh anode and a Ti/RuO 2 mesh cathode, to degrade the insecticide imidacloprid spiked at 1.2-59.2 mg L À 1 into low conductivity groundwater by electrochemical oxidation. The natural water matrix was first softened using valorized industrial waste in the form of zeolite as reactive sorbent. Total removal of the insecticide, always obeying pseudo-first-order kinetics, and maximum mineralization degrees of 70 %-87 % were achieved, with energy consumption of 26.4 � 1.6 kWh m À 3 . Active chlorine in the bulk and * OH at the BDD surface were the main oxidants. Comparative studies using simulated water with analogous anions content revealed that the natural organic matter interfered in the groundwater treatment. Trials carried out in ultrapure water showed the primary conversion of the initial N and Cl atoms of imidacloprid to NO 3 À and Cl À ions, being the latter anion eventually transformed into ClO 3 À and ClO 4 À ions. 6-Chloro-nicotinonitrile, 6-chloro-pyridine-3-carbaldehyde, and tartaric acid were identified as oxidation products.[a] R.

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Influence of the anode material on the degradation of naproxen by Fenton-based electrochemical processes

Cited by 122 publications

References 45 publications

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Use of Pt and Boron‐Doped Diamond Anodes in the Electrochemical Advanced Oxidation of Ponceau SS Diazo Dye in Acidic Sulfate Medium

Groundwater Treatment using a Solid Polymer Electrolyte Cell with Mesh Electrodes

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