Electro-Fenton process for water and wastewater treatment

He, Huanqi; Zhou, Zhi

doi:10.1080/10643389.2017.1405673

Cited by 201 publications

(59 citation statements)

References 145 publications

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“…There are notable advantages of the electrochemistry, including energy efficiency, versatility and environmental suitability as the electron and main-stream reagents are clean. Hence, by coupling the electrochemistry with the Fenton process, the oxidation efficiency can be significantly improved [131]. The electro-Fenton oxidation process consists of either adding Fe 2+ or reducing Fe 3+ electrochemically along with the simultaneous production of H 2 O 2 from the reduction of O 2 on the electrodes [131].…”

Section: Fenton Reactionmentioning

confidence: 99%

“…Hence, by coupling the electrochemistry with the Fenton process, the oxidation efficiency can be significantly improved [131]. The electro-Fenton oxidation process consists of either adding Fe 2+ or reducing Fe 3+ electrochemically along with the simultaneous production of H 2 O 2 from the reduction of O 2 on the electrodes [131]. Hydrogen peroxide is electrogenerated in acidic solutions by the two-electron reduction of oxygen on the cathode surface according to Equation (10) [132].…”

Section: Fenton Reactionmentioning

confidence: 99%

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Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview

Javaid

Qazi

2019

IJERPH

274

101

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Dyes are used in various industries as coloring agents. The discharge of dyes, specifically synthetic dyes, in wastewater represents a serious environmental problem and causes public health concerns. The implementation of regulations for wastewater discharge has forced research towards either the development of new processes or the improvement of available techniques to attain efficient degradation of dyes. Catalytic oxidation is one of the advanced oxidation processes (AOPs), based on the active radicals produced during the reaction in the presence of a catalyst. This paper reviews the problems of dyes and hydroxyl radical-based oxidation processes, including Fenton’s process, non-iron metal catalysts, and the application of thin metal catalyst-coated tubular reactors in detail. In addition, the sulfate radical-based catalytic oxidation technique has also been described. This study also includes the effects of various operating parameters such as pH, temperature, the concentration of the oxidant, the initial concentration of dyes, and reaction time on the catalytic decomposition of dyes. Moreover, this paper analyzes the recent studies on catalytic oxidation processes. From the present study, it can be concluded that catalytic oxidation processes are very active and environmentally friendly methods for dye removal.

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Section: Fenton Reactionmentioning

confidence: 99%

Section: Fenton Reactionmentioning

confidence: 99%

Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview

Javaid

Qazi

2019

IJERPH

274

101

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“…Adicionalmente, el Fe 2+ puede ser regenerado por medio de la reducción de Fe 3+ en el cátodo [28] , (7) creando también en el ánodo radicales • OH con la oxidación del H 2 O [27] . (8) Los factores que se ha reconocido que influyen en electro-Fenton son [29] : 1) concentración de la relación Fe 2+ /Fe 3+ , 2) concentración de H 2 O 2 , 3) concentración inicial de contaminantes, 4) pH, 5) electrolito como Na 2 SO 4 , KCl, NaCl, NaNO 3 o NaClO 4 en el rango de 50 a 100 mM, 6) velocidad de rociado de oxígeno, 7) modo de alimentación de oxígeno, 8) densidad de corriente, 9) temperatura de operación, 10) materiales electródicos y 11) distancia entre electrodos.…”

Section: B1 Fentonunclassified

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Juárez¹

2020

CULCYT

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RESUMENEl objetivo de la presente revisión es presentar investigaciones recientes sobre la remoción de algunos edulcorantes -reconocidos como contaminantes emergentes-del agua o matrices acuosas, utilizando los Procesos de Oxidación Avanzada (POA). En un intento por evadir el consumo de endulzantes calóricos que han provocado problemas de salud, los seres humanos consumen edulcorantes artificiales que prácticamente no se metabolizan después de ingerirse, de esa forma se integran al agua residual e inclusive resisten la degradación total en las plantas de tratamiento de agua convencionales. Por tanto, en bases de datos se revisaron electrooxidación, electro-Fenton, foto-Fenton, fotocatálisis heterogénea, oxidación por ultravioleta/peróxido y oxidación por ultravioleta/ozono, catalogados como POA. Estos procesos son una alternativa debido a que generan radicales hidroxilo ·OH, caracterizados por su alto poder oxidante. La electrooxidación se puede declarar como la más conveniente para la degradación de edulcorantes artificiales como el acesulfamo de potasio, por ejemplo, debido a la menor cantidad de componentes requeridos para su ejecución y, al mismo tiempo, se logra una eficiencia de remoción similar, o incluso mayor, comparada con otros POA. Igualmente, se documentaron los resultados y méritos relativos a la aplicación de estos al agua o matrices acuosas, así como las oportunidades para investigación futura. ABSTRACTThe objective of this review is to present recent research on the removal of some sweeteners-recognized as emerging contaminants-from water or aqueous matrices, using the Advanced Oxidation Processes (AOPs). In an attempt to evade the consumption of caloric sweeteners that has caused health problems, humans consume artificial sweeteners that are practically not metabolized after ingestion, thus integrating into wastewater and even resisting total degradation in plants conventional water treatment. Therefore, electro-oxidation, electro-Fenton, photo-Fenton, heterogeneous photocatalysis, ultraviolet / peroxide oxidation and ultraviolet / ozone oxidation cataloged as AOPs were reviewed in databases. These processes are an alternative because they generate hydroxyl radicals ·OH characterized by their high oxidizing power. Electro-oxidation can be declared as the most convenient for the degradation of artificial sweeteners such as potassium acesulfame, for example, due to the lower amount of components required for its execution and at the same time the achievement of a similar removal efficiency, or even greater, compared to other AOPs. Likewise, the results and merits related to their application to water or aqueous matrices were documented, as well as the opportunities for future research.

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“…In the electro-Fenton process, Fe 2+ and H 2 O 2 are produced simultaneously by cathodic reduction of Fe 3+ and O 2 , respectively (reactions EF1 and EF2, Table 1) (Barhoumi et al 2015(Barhoumi et al , 2016He and Zhou 2017;Lin et al 2017a;Mousset et al 2018;Mousset et al 2016Mousset et al , 2018Nidheesh et al 2018;Sirés et al 2014;Wang et al 2016). A small amount of salt of Fe 2+ (e.g., ferrous sulfate) is initially added, which can react with electrochemically produced H 2 O 2 to produce Fe 3+ .…”

Section: Fenton's Reagentmentioning

confidence: 99%

Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes

Jain¹,

Singh²,

Kim

et al. 2018

Environ Chem Lett

301

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Nowadays, the water ecosystem is being polluted due to the rapid industrialization and massive use of antibiotics, fertilizers, cosmetics, paints, and other chemicals. Chemical oxidation is one of the most applied processes to degrade contaminants in water. However, chemicals are often unable to completely mineralize the pollutants. Enhanced pollutant degradation can be achieved by Fenton reaction and related processes. As a consequence, Fenton reactions have received great attention in the treatment of domestic and industrial wastewater effluents. Currently, homogeneous and heterogeneous Fenton processes are being investigated intensively and optimized for applications, either alone or in a combination of other processes. This review presents fundamental chemistry involved in various kinds of homogeneous Fenton reactions, which include classical Fenton, electro-Fenton, photo-Fenton, electro-Fenton, sono-electro-Fenton, and solar photoelectron-Fenton. In the homogeneous Fenton reaction process, the molar ratio of iron(II) and hydrogen peroxide, and the pH usually determine the effectiveness of removing target pollutants and subsequently their mineralization, monitored by a decrease in levels of total organic carbon or chemical oxygen demand. We present catalysts used in heterogeneous Fenton or Fenton-like reactions, such as H 2 O 2-Fe 3+ (solid)/nano-zero-valent iron/immobilized iron and electro-Fenton-pyrite. Surface properties of heterogeneous catalysts generally control the efficiency to degrade pollutants. Examples of Fenton reactions are demonstrated to degrade and mineralize a wide range of water pollutants in real industrial wastewaters, such as dyes and phenols. Removal of various antibiotics by homogeneous and heterogeneous Fenton reactions is exemplified.

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Electro-Fenton process for water and wastewater treatment

Cited by 201 publications

References 145 publications

Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview

Catalytic Oxidation Process for the Degradation of Synthetic Dyes: An Overview

Procesos de Oxidación Avanzada y Electroquímicos para Remover Edulcorantes Artificiales del Agua

Treatment of organic pollutants by homogeneous and heterogeneous Fenton reaction processes

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