Evaluation of different cathodes and reaction parameters on the enhancement of the electro-Fenton process

Popescu, Marius; Sandu, Ciprian; Rosales, Emílio; Pazos, Marta; Lazăr, Gabriel; Sanromán, Á.

doi:10.1016/j.jelechem.2017.04.047

Cited by 32 publications

(14 citation statements)

References 53 publications

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“…Typically, SOCs include solvents, preservatives, pharmaceuticals and personal care products, lubricants, dyes or active substances for plant protection [5]. Among the latter, methomyl (MET) and pyrimethanil (PYR) are ubiquitous in intensive agriculture, which is worrisome since they are classified as persistent organic pollutants (POPs) [6] and are considered extremely toxic [7,8]. This issue has prompted the application of advanced oxidation processes (AOPs) for the fast and complete removal of SOCs from polluted water streams [9], based on the in situ production of hydroxyl radical ( • OH) as main reactive oxygen species (ROS).…”

Section: Introductionmentioning

confidence: 99%

“…At The plant was further validated by performing degradation trials under optimum conditions using a mixture of fungicide PYR and insecticide MET spiked into conductive water at high concentrations to simulate real agricultural wastewater. Note that these pesticides have only been studied before by AOPs like solar TiO2 photocatalysis and solar photo-Fenton at pilot scale [6] and EF at lab scale [8].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of electrocatalytic H2O2 production at pilot plant scale for solar-assisted water treatment

Garcı́a

Plakas

Sirés

et al. 2019

Applied Catalysis B: Environmental

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This manuscript summarizes the successful start-up and operation of a hybrid eco-engineered water treatment system, at pilot scale. The pilot unit, with 100-L capacity, has been devised for the efficient electrocatalytic production of H2O2 at an air-diffusion cathode, triggering the formation of • OH from Fenton's reaction with added Fe 2+ catalyst. These radicals, in combination with those formed at a powerful boron-doped diamond (BDD) anode in an undivided cell, are used to degrade a mixture of model pesticides. The capability of the plant to produce Η2Ο2 on site was initially optimized using an experimental design based on central composite design (CCD) coupled with response surface methodology (RSM). This aimed to evaluate the effect of key process parameters like current density (j) and solution pH. The influence of electrolyte concentration as well as liquid and air flow rates on H2O2 electrogeneration and current efficiency at optimized j and pH was also assessed. The best operation conditions resulted in H2O2 mass production rate of 64.9 mg min -1 , 89.3% of current efficiency and 0.4 kWh m -3 of energy consumption at short electrolysis time.Performance tests at optimum conditions were carried out with 75 L of a mixture of pesticides (pyrimethanil and methomyl) as a first step towards the elimination of organic contaminants by solar photoelectro-Fenton (SPEF) process. The combined action of homogeneous ( • OH) and heterogeneous (BDD( • OH)) catalysis along with photocatalysis (UV photons collected at a solar CPC photoreactor) allowed the removal of more than 50% of both pesticides in 5 min, confirming the fast regeneration of Fe 2+ catalyst through cathodic reduction and photo-Fenton reaction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of electrocatalytic H2O2 production at pilot plant scale for solar-assisted water treatment

Garcı́a

Plakas

Sirés

et al. 2019

Applied Catalysis B: Environmental

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“…The TOC calculation method was based on Equation (7), where ΔTOC is the change in the concentration response and TOC 0 (mg/L) is the initial value of total organic carbon. For the graphite felt (GF), the taffeta carbon fiber (TCF) removal of pyrimethanil indicated a TOC removal at 0.3 A of up to 42.36% after 120 min of the electro-Fenton reaction [33]. Zhou et al used CF to decompose p -nitrophenol contaminants in the electro-Fenton system, with a TOC removal rate of 22.2% in 30 min and a CF treated with ethanol and hydrazine hydrate (N 2 H 4 ·H 2 O) TOC removal rate of 51.4% [34].…”

Section: Resultsmentioning

confidence: 99%

Application of Graphene and Carbon Nanotubes on Carbon Felt Electrodes for the Electro-Fenton System

Wang

Lin

2019

Materials

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The electro-Fenton system has the ability to degrade wastewater and has received attention from many researchers. Currently, the core development objective is to effectively increase the degraded wastewater decolorization efficiency in the system. In this study, to improve the electro-Fenton system reaction rate and overall electrical properties, we used polyvinylidene difluoride to fix carbon nanotubes (CNTs) and graphene onto the system cathode (carbon felt electrode), which was then used to process Reactive Black 5 wastewater. Furthermore, we (1) used scanning electron microscopy to observe the structural changes in the electrode surface after modification; (2) used the Tafel curve to determine the electrode corrosion voltage and corrosion rate; and (3) analyzed the azo-dye decolorization level. The results showed that the maximum system decolorization rates of the CNT- and graphene-modified carbon felt electrodes were 55.3% and 70.1%, respectively. These rates were, respectively, 1.2 and 1.5 times higher than that of the unmodified carbon felt electrode, implying that we successfully improved the cathode characteristics. The modified electrode exhibited an improved conductivity and corrosion resistance, which, in turn, improved the system decolorization efficiency. This significantly increased the electro-Fenton system overall efficacy, making it valuable for future applications.

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“…According to the statement of Equation , if the amount of electro‐generated H 2 O 2 was adequate, the presence of Fe 2+ increased the generation of • OH and accelerated the E‐Fenton reaction. However, the excessive amount of Fe 2+ probably resulted in flocculation of Fe(OH) 3 , which limited the progress of E‐Fenton reaction …”

Section: Resultsmentioning

confidence: 99%

Mineralization of mefenamic acid from hospital wastewater using electro‐Fenton degradation: Optimization and identification of removal mechanism issues

Dolatabadi

Ahmadzadeh

Ghaneian

2019

Env Prog and Sustain Energy

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Mefenamic acid (MFA) is a nonsteroidal anti-inflammatory drug widely used for the short-term treatment of mild to moderate pain as well as treatment of primary dysmenorrhea and for decreasing the pain and blood loss during menstrual periods.Since MFA has been detected in raw and sewage water worldwide, the current work deals with the optimizing of removal of MFA from hospital wastewater using the electro-Fenton (E-Fenton) process. A cylindrical Pyrex reactor containing 250 ml of wastewater was employed for treatment investigation. The effects of main variables on the removal process were investigated and the optimum experimental condition was obtained with adequate desirability under the response surface methodology.The obtained results revealed that the removal efficiency of 95.3% was achieved under the optimal experimental condition, including MFA initial concentration of 7.0 mg L −1 , the H 2 O 2 dosage of 700 μl/L, the current density of 6.6 mA cm −2 , and the reaction time of 12 min. The removal mechanism studies showed that • OH as the dominant radical species plays the main role in E-Fenton process. The MFA removal followed the pseudo-first-order kinetic model. Under the optimum condition of the E-Fenton process, the removal efficiency of MFA from synthetic wastewater was in satisfactory agreement with the real hospital wastewater treatment.

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Evaluation of different cathodes and reaction parameters on the enhancement of the electro-Fenton process

Cited by 32 publications

References 53 publications

Optimization of electrocatalytic H2O2 production at pilot plant scale for solar-assisted water treatment

Optimization of electrocatalytic H2O2 production at pilot plant scale for solar-assisted water treatment

Application of Graphene and Carbon Nanotubes on Carbon Felt Electrodes for the Electro-Fenton System

Mineralization of mefenamic acid from hospital wastewater using electro‐Fenton degradation: Optimization and identification of removal mechanism issues

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