Application of photoelectro-fenton process modified with porous cathode electrode in removing resistant organic compounds from aquatic solutions: modeling, toxicity and kinetics

2020 ◽  
Vol 37 (6) ◽  
pp. 969-977
Author(s):  
Reza Ali Fallahzadeh ◽  
Mohammad Hassan Ehrampoush ◽  
Mohsen Nabi Meybodi ◽  
Mohammad Taghi Ghaneian ◽  
Arash Dalvand ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Fenton Process ◽  
Porous Cathode ◽  
Cathode Electrode

Experimental and Modelling Approach for the Comparison of Fenton and Electro-Fenton Processes. Preliminary Results

2006 ◽  
Vol 9 (1) ◽  
Author(s):  
Truong Giang Le ◽  
Alain Bermond
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Organic Compounds ◽  
Fenton Reaction ◽  
Experimental Approach ◽  
Fenton Process ◽  
Iron Salt ◽  
Preliminary Results ◽  
Modelling Approach

AbstractThe Electro-Fenton is one of the processes based on the Fenton reaction, which have been investigated to improve the efficiency of classical Fenton treatment. The Electro-Fenton has been shown to be efficient in the degradation of many organic compounds. However, generally there is no true estimation of its efficiency compared to that of the classical Fenton process. This study aimed to compare the two processes using an experimental approach and modelling. First of all, degradation of hydrogen peroxide (externally applied) was studied. It was shown that the Electro-Fenton process needs smaller quantities of iron (5 times less) than the Fenton to decompose the same quantity of hydrogen peroxide. The Electro-Fenton process may also produce hydrogen peroxide in situ (oxygen reduction). This leads to an important reduction in the consumption of chemicals (hydrogen peroxide, small quantities of iron salt). Finally, a study of the degradation of phenol, when hydrogen peroxide was electrogenerated has shown the greater efficiency of Electro-Fenton compared to the Fenton process.

Advances in the Electro-Fenton Process for Remediation of Recalcitrant Organic Compounds

2012 ◽  
Vol 35 (4) ◽  
pp. 609-617 ◽  
Author(s):  
E. Rosales ◽  
M. Pazos ◽  
M. A. Sanromán
Keyword(s):  
Organic Compounds ◽  
Fenton Process

scholarly journals Review: Clay-Modified Electrodes in Heterogeneous Electro-Fenton Process for Degradation of Organic Compounds: The Potential of Structural Fe(III) as Catalytic Sites

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7742
Author(s):  
Laura Cipriano Crapina ◽  
Liva Dzene ◽  
Jocelyne Brendlé ◽  
Florence Fourcade ◽  
Abdeltif Amrane ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Organic Compounds ◽  
Advanced Oxidation Processes ◽  
Modified Electrodes ◽  
Fenton Process ◽  
Comprehensive Review ◽  
Oxidation Processes ◽  
Industrial Wastewaters ◽  
Catalytic Sites ◽  
Mineral Structure

Advanced oxidation processes are considered as a promising technology for the removal of persistent organic pollutants from industrial wastewaters. In particular, the heterogeneous electro-Fenton (HEF) process has several advantages such as allowing the working pH to be circumneutral or alkaline, recovering and reusing the catalyst and avoiding the release of iron in the environment as a secondary pollutant. Among different iron-containing catalysts, studies using clay-modified electrodes in HEF process are the focus in this review. Fe(III)/Fe(II) within the lattice of clay minerals can possibly serve as catalytic sites in HEF process. The description of the preparation and application of clay-modified electrodes in the degradation of model pollutants in HEF process is detailed in the review. The absence of mediators responsible for transferring electrons to structural Fe(III) and regenerating catalytic Fe(II) was considered as a milestone in the field. A comprehensive review of studies investigating the use of electron transfer mediators as well as the mechanism behind electron transfer from and to the clay mineral structure was assembled in order to uncover other milestones to be addressed in this study area.

Regulation of Hydrogen Peroxide Dosage in a Heterogeneous Photo-Fenton Process

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2167
Author(s):  
Karla Estefanía Saldaña-Flores ◽  
René Alejandro Flores-Estrella ◽  
Victor Alcaraz-Gonzalez ◽  
Elvis Carissimi ◽  
Bruna Gonçalves de Souza ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Organic Compounds ◽  
Closed Loop ◽  
Transfer Functions ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Open Loop ◽  
Fenton Process ◽  
Control Approach ◽  
Curve Method

In this work, a classical linear control approach for the peroxide (H2O2) dosage in a photo-Fenton process is presented as a suitable solution for improving the efficiency in the treatment of recalcitrant organic compounds that cannot be degraded by classical wastewater treatment processes like anaerobic digestion. Experiments were carried out to degrade Lignin, Melanoidin, and Gallic acid, which are typical recalcitrant organic compounds present in some kinds of effluents such as vinasses from the Tequila and Cachaça industries. Experiments were carried in Open-Loop mode for obtaining the degradation model for the three compounds in the form of a Transfer Function, and in Closed-Loop mode for controlling the concentration of each compound. First-order Transfer Functions were obtained using the reaction curve method, and then, based on these models, the parameters of Proportional Integral controllers were calculated using the direct synthesis method. In the Closed-Loop experiments, the Total Organic Carbon removal was 39% for lignin, 7% for melanoidin, and 29% for Gallic acid, which were greater than those obtained in the Open-Loop experiments.

scholarly journals Degradation of Abamectin Using the Photo-Fenton Process

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Thiago Augusto de Freitas Matos ◽  
Alexandra Lemos Nunes Dias ◽  
Amanda Di Piazza Reis ◽  
Milady Renata Apolinário da Silva ◽  
Márcia Matiko Kondo
Keyword(s):  
Water Treatment ◽  
Organic Compounds ◽  
Natural Water ◽  
Water Samples ◽  
Advanced Oxidation Processes ◽  
Active Principle ◽  
Fenton Process ◽  
Initial Amount ◽  
Oxidation Processes ◽  
Alternative Procedures

The cultivation of strawberries generally requires substantial use of pesticides, and abamectin is the active principle of one of those most commonly employed. Conventional water treatment does not remove pesticides efficiently, so there is a need to investigate alternative procedures. The use of advanced oxidation processes (AOPs) can achieve good results in removal of toxic organic compounds present in aqueous solutions. The photo-Fenton process, one example of an AOP, was employed to study the degradation of abamectin. Results showed that when natural water samples contaminated with abamectin were treated using the photo-Fenton process, 70% of the initial amount of the compound was removed within 60 minutes of UV irradiation, and 60% mineralization was observed after 180 minutes of reaction.

scholarly journals Degradation of Reactive Red 120 dye by a heterogeneous Sono-Fenton process with goethite deposited onto silica and calcite sand

2020 ◽  
Vol 85 (1) ◽  
pp. 125-140
Author(s):  
Soraya Garófalo-Villalta ◽  
Tanya Medina-Espinosa ◽  
Christian Sandoval-Pauker ◽  
William Villacis ◽  
Valerian Ciobotă ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Chemical Oxygen Demand ◽  
Total Organic Carbon ◽  
Organic Compounds ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Fenton Process ◽  
Reactive Red 120

The degradation of Reactive Red 120 dye (RR-120) in synthetic waters was studied. Two processes were considered: homogeneous sono-Fenton with iron(II) sulfate and heterogeneous sono-Fenton with synthetic goethite and goethite deposited onto silica and calcite sand (modified catalysts GS and GC, respectively). In 60 min of reaction, the homogeneous sono-Fenton process allowed a degradation of 98.10 %, in contrast with 96.07 % for the heterogeneous sono-Fenton process with goethite at pH 3.0. The removal of RR-120 increased when the modified catalysts were used instead of bare goethite. Chemical oxygen demand (COD) and total organic carbon (TOC) measurements showed that the highest TOC and COD removals were achieved with the homogeneous sono-Fenton process. Biochemical oxygen demand (BOD5) measurements allowed confirmed that the highest value of BOD5/COD was achieved with a heterogeneous sono-Fenton process (0.88?0.04 with the modified catalyst GC), demonstrating that the biodegradability of the residual organic compounds was remarkably improved.

scholarly journals Fenton process in dispersed systems for industrial wastewater treatment

2019 ◽  
Vol 73 (1) ◽  
pp. 47-62
Author(s):  
Ana Popovic ◽  
Sonja Milicevic ◽  
Vladan Milosevic ◽  
Branislav Ivosevic ◽  
Jelena Carapic ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Organic Compounds ◽  
Hydroxyl Radicals ◽  
Process Parameters ◽  
Ferrous Iron ◽  
Industrial Wastewater ◽  
Operating Conditions ◽  
Fluidized Bed Reactors ◽  
Fenton Process ◽  
Dispersed Systems

Industrial wastewater contains recalcitrant organic compounds with a very complex chemical structure, built of molecules with long chains of carbon atoms and attached different functional groups. Chemical or biological treatments used for removal of these compounds are being replaced with more efficient non-commercial wastewater treatments. Advanced oxidation processes overcome limitations of conventional methods regarding formation of by-products during degradation of recalcitrant organic compounds. The Fenton process, or use of the Fenton?s reagent, has became one of the most utilized processes due to simplicity, economy and accessible amounts of ferrous iron and hydrogen-peroxide, which are used in the process. In specific, the Fenton?s reagent is a catalytic-oxidative mixture of these two components. The ferrous iron Fe2+ initiates and catalyzes decomposition of H2O2, resulting in generation of hydroxyl radicals, which are the main radical species in the process able to detoxify several organic pollutants by oxidation. In addition, other mechanisms besides formation of hydroxyl radicals may occur during the Fenton process and participate in degradation of target pollutants. Generally, the treatment efficiency relies upon the physical and chemical properties of target pollutants and the process operating conditions. The main disadvantage of the Fenton process is production of sludge formed by iron hydroxide at certain pH values. An alternative solution for this problem is application of this process in fluidized bed reactors. This paper presents an overview of Fenton and photo-Fenton processes in dispersed systems for removal of different industrial wastewater pollutants. The most important process parameters, required for efficient degradation of recalcitrant organic compounds are also described, such as the catalyst type, pH value, temperature, H2O2 concentration and retention time. Strict control of Fenton process parameters in fluidized bed reactors at desired values can bring these systems to the commercial use.

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