Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

Rezaei, Farzad; Vione, Davide

doi:10.3390/molecules23123127

Cited by 117 publications

(53 citation statements)

References 110 publications

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“…However, generation of large values of iron-containing sludge and limited operating pH range (an optimal run is performed at pH ~3) of EF process urges the development of EF-like process which can be operated in a completely heterogeneous and neutral system. 55,56 60 . In this case, we thus evaluated the Fenton-like performance of NiOC catalyst in neutral system and observed that NiOC catalyst exhibited a more effective degradability compared with that of O-C catalyst under the same experiment conditions (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Integrated and Superaerophilic Ni-O-C Electrode enables Fast and Stable Electrochemical H2O2 Production for Electro-Fenton-like Process

Liang

Gong

et al. 2021

Preprint

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Fast and stable production of hydrogen peroxide (H2O2) through electrochemical pathways is crucial for wastewater treatment applications. With this objective, herein we report an integrated and superaerophilic electrode composed of atomically dispersed Ni-O-C sites enriched carbon nanosheets (IS-NiOC electrode) for electrochemical oxygen reduction to produce H2O2. Both experimental and theoretical results have proven that atomically dispersed Ni-O-C sites enable a low overpotential (260 mV at 0.1 mA cm− 2) and high selectivity (> 90% at 0.0 ~ 0.5 V vs. RHE) in neutral electrolyte. Compared with a commercial gas-diffusion electrode, the IS-NiOC electrode offers stronger affinity to oxygen bubbles and more robust three-phase contact points, resulting in high current density (~ 106 mA cm− 2 at 0.25 V vs. RHE) and superior stability (~ 200 h). These merits allow the application of the IS-NiOC electrode in an electro-Fenton-like process, which enables fast degradation of representative organic pollutants in both steady state and flow state.

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Section: Resultsmentioning

confidence: 99%

Integrated and Superaerophilic Ni-O-C Electrode enables Fast and Stable Electrochemical H2O2 Production for Electro-Fenton-like Process

Liang

Gong

et al. 2021

Preprint

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“…The oxidizing power of the Fenton system degradation mechanism is based on creation • OH radicals by decomposition of H2O2 onto iron ion (Fe 2+ ) promoter. 37 It was demonstrated previously that pH affects the iron ion oxidation, and subsequently it affects the rate of hydroxyl radicals generation. 38 The optimal range of pH has been reported to be 2 -4.…”

Section: Introductionmentioning

confidence: 97%

Towards Enhanced Catalytic Activity of Magnetic Nanoparticles Integrated into 3D Reduced Graphene Oxide for Heterogeneous Fenton Organic Dye Degradation

Sadegh

Politakos

Sánz

et al. 2021

Preprint

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Composite Fenton nanocatalyst was prepared by water-based in situ creation of Fe3O4 nanoparticles integrated within self-assembly 3D reduced graphene oxide (rGO) aerogel. It was used for degradation of Acid Green 25 (AG-25) organic dye in aqueous solution, in presence of H2O2. By investigating the conditions that maximize the dye adsorption by the 3D composite, it was found that the pH of the solution should be adjusted between the pKa of the functional groups presented on the rGO surface (carboxylic acid) and that of the dye (sulfonic acid) to promote electrostatic interactions dye − 3D structure. Performed under these conditions, Fenton degradation of AG-25 in presence of H2O2 was completed in less than 30 min, including all the intermediate products, as demonstrated by MALDI-TOF-MS analysis of the aqueous solution after discoloration. Moreover, this was achieved in a solution with as high dye concentration as 0.5 mg/mL, with only 10 mg of 3D composite catalyst, at room temperature and without additional energy input. The high performance was attributed to the creation of charge transfer complex between the rGO and Fe3O4 nanoparticles throughout covalent bond C-O-Fe, the formation of which was promoted by the in situ synthesis procedure.

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“…Moreover, direct use of ferrous salt catalyst results in rapid and useless consumption of Fe 2+ as well as overload of ferric ions in the treatment medium [ 12 , 13 ]. Therefore, several studies have reported the use of zero valent iron (ZVI) as the heterogeneous source of Fe 2+ ions in the Fenton process [ 14 , 15 ]. In this technology, ZVI metal in contact with aqueous solution corrodes spontaneously producing ferrous ions [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Energy-from-Waste Approach for Electrical Energy Production by Galvano–Fenton Process

et al. 2021

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A novel approach allowing the production of electrical energy by an advanced oxidation process is proposed to eliminate organic micropollutants (MPs) in wastewaters. This approach is based on associating the Galvano–Fenton process to the generation of electrical power. In the previous studies describing the Galvano–Fenton (GF) process, iron was directly coupled to a metal of more positive potential to ensure degradation of organic pollutants without any possibility of producing electrical energy. In this new approach, the Galvano–Fenton process is constructed as an electrochemical cell with an external circuit allowing recovering electrons exchanged during the process. In this study, Malachite Green (MG) dye was used as a model of organic pollutant. Simultaneous MG degradation and electrical energy production with the GF method were investigated in batch process. The investigation of various design parameters emphasis that utilization of copper as a low-cost cathode material in the galvanic couple, provides the best treatment and electrical production performances. Moreover, these performances are improved by increasing the surface area of the cathode. The present work reveals that the GF process has a potential to provide an electrical power density of about 200 W m−2. These interesting performances indicate that this novel Energy-from-Waste strategy of the GF process could serve as an ecological solution for wastewater treatment.

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Effect of pH on Zero Valent Iron Performance in Heterogeneous Fenton and Fenton-Like Processes: A Review

Cited by 117 publications

References 110 publications

Integrated and Superaerophilic Ni-O-C Electrode enables Fast and Stable Electrochemical H2O2 Production for Electro-Fenton-like Process

Integrated and Superaerophilic Ni-O-C Electrode enables Fast and Stable Electrochemical H2O2 Production for Electro-Fenton-like Process

Towards Enhanced Catalytic Activity of Magnetic Nanoparticles Integrated into 3D Reduced Graphene Oxide for Heterogeneous Fenton Organic Dye Degradation

A Novel Energy-from-Waste Approach for Electrical Energy Production by Galvano–Fenton Process

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