Degradation of di-n-butyl phthalate by a homogeneous sono–photo–Fenton process with in situ generated hydrogen peroxide

2014 ◽  
Vol 240 ◽  
pp. 541-547 ◽  
Author(s):  
L.J. Xu ◽  
W. Chu ◽  
Nigel Graham
Keyword(s):  
Hydrogen Peroxide ◽  
Fenton Process ◽  
Butyl Phthalate

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.

Electrocatalytic Activity of Three Carbon Materials for the In-situ Production of Hydrogen Peroxide and Its Application to the Electro-Fenton Heterogeneous Process

2016 ◽  
Vol 14 (4) ◽  
pp. 843-850 ◽  
Author(s):  
Orlando García-Rodríguez ◽  
Jennifer A. Bañuelos ◽  
Arturo Rico-Zavala ◽  
Luis A. Godínez ◽  
Francisco J. Rodríguez-Valadez
Keyword(s):  
Hydrogen Peroxide ◽  
Electrocatalytic Activity ◽  
Lower Cost ◽  
Carbon Materials ◽  
Carbon Cloth ◽  
Fenton Process ◽  
Toc Removal ◽  
Iron Salts ◽  
Production Of Hydrogen

Abstract The in-situ generation of hydrogen peroxide in the electro-Fenton process is paramount. For this reason, in this research the electrocatalytic activity of three carbon materials was evaluated in the reaction of oxygen reduction via two electrons. Furthermore, in order to eliminate the use of iron salts in solution (homogeneous process), the iron was electrodeposited on the surface of the carbon material and was applied in a heterogeneous electro-Fenton process for the degradation of methyl orange dye. The largest amount of generated H2O2 was achieved with the Carbon Felt (CF) electrode (460 mg L−1) without iron after 60 minutes. The electrodes with electrodeposited iron were characterized by SEM and EDS, which showed that the surface of the Carbon Sponge (CS) electrode had the largest amount of iron (23.84 %). However, the CF electrode showed a greater and faster degradation of the dye (98 %) after 30 minutes of treatment. The CF material was the best and most-viable choice of material compared to the CS and Carbon Cloth (CC) for industrial application in electro-Fenton processes, due to its greater catalytic activity in the production of H2O2, uniform distribution of iron, more efficient TOC removal and lower cost per cm2 of material.

scholarly journals Treatment of Water Contaminated with DI-N-Butyl Phthalate by Foto-Fenton Process

2013 ◽  
Vol 5 (1) ◽  
pp. 23-28
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radical ◽  
Uv Irradiation ◽  
Fenton’S Reagent ◽  
H2o2 Concentration ◽  
Fenton Process ◽  
Ferrous Ions ◽  
Fenton's Reagent ◽  
Dominant Mechanism ◽  
Butyl Phthalate

This study was conducted to assess the removal efficiency of Di-n-butyl phthalate (DnBP) from aqueous medium using the photo-Fenton process. The Fenton's reagent that consists of a mixture of hydrogen peroxide (H2O) and ferrous ions (Fe2+) was used to generate the hydroxyl radical (OH0) that attacks the target contaminant and degrade it. An ultraviolet (UV) source was used to provide the radiation needed in the photo-Fenton method (i.e. UV/H2O2/Fe2+). The results demonstrated that photo-Fenton process was more effective and faster than Fenton's reagent in removing DnBP and that photolysis by UV irradiation was the dominant mechanism in degrading the compound. The results also showed that enhancing the removal via UV irradiation was achieved by increasing either the temperature or the H2O2 concentration.

Application of the Electrokinetic-Fenton Process for the Treatment of Lubricant-Contaminated Railroad Soil

2014 ◽  
Vol 955-959 ◽  
pp. 2248-2253 ◽  
Author(s):  
Hae Suk Kang ◽  
Jae Young Lee ◽  
Bo Kyong Kim ◽  
Tae Soon Kwon
Keyword(s):  
Hydrogen Peroxide ◽  
Soil Pollution ◽  
Removal Efficiency ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Operating Conditions ◽  
Heavy Oils ◽  
Fenton Process ◽  
Lubricant Oil

Soil pollution around railroad sites is mainly caused by heavy oils such as diesel and lubricants. In particular, the majority of contamination in soil around railroad turnouts is caused by oil that drips off of railcars and lubricants that leak during vehicle maintenance. Generally, removing lubricants from contaminated soil is more difficult than removing diesel, due to the properties of the respective oils. This study aims to investigate alternative remediation method of lubricant-contaminated soils around railroad turnouts. The EK-Fenton process was used to clean up the lubricant-contaminated railroad soil. Several operating conditions were tested, including the concentration of hydrogen peroxide, and electrolyte types and concentrations. We determined that the removal efficiency was affected by the amount of EOF in the soil and its oxidizing capacity. The TPH removal efficiency was greatest at 0.1 M of NaCl electrolyte and 5 % (v/v) of hydrogen peroxide. This shows that the in-situ EK-Fenton process is a promising remediation technique for decontaminating railroad soil polluted with lubricant oil.

CHEMICAL OXIDATION OF TREATED TEXTILE EFFLUENT BY HYDROGEN PEROXIDE AND FENTON PROCESS

2010 ◽  
Vol 9 (3) ◽  
pp. 351-360 ◽  
Author(s):  
Abdelnaser Omran ◽  
Hamidi Abdul Aziz ◽  
Marniyanti Mamat Noor
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Oxidation ◽  
Textile Effluent ◽  
Fenton Process

scholarly journals Au Modified F-TiO2 for Efficient Photocatalytic Synthesis of Hydrogen Peroxide

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3844
Author(s):  
Lijuan Li ◽  
Bingdong Li ◽  
Liwei Feng ◽  
Xiaoqiu Zhang ◽  
Yuqian Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction System ◽  
Reaction Medium ◽  
Pure Tio2 ◽  
H2o2 Production ◽  
Tio2 Photocatalyst ◽  
H2o2 Decomposition ◽  
Spin Resonance ◽  
Photocatalytic Synthesis

In this work, Au-modified F-TiO2 is developed as a simple and efficient photocatalyst for H2O2 production under ultraviolet light. The Au/F-TiO2 photocatalyst avoids the necessity of adding fluoride into the reaction medium for enhancing H2O2 synthesis, as in a pure TiO2 reaction system. The F− modification inhibits the H2O2 decomposition through the formation of the ≡Ti–F complex. Au is an active cocatalyst for photocatalytic H2O2 production. We compared the activity of TiO2 with F− modification and without F− modification in the presence of Au, and found that the H2O2 production rate over Au/F-TiO2 reaches four times that of Au/TiO2. In situ electron spin resonance studies have shown that H2O2 is produced by stepwise single-electron oxygen reduction on the Au/F-TiO2 photocatalyst.

Effects of hydrogen peroxide and hypochlorite on membrane potential of mitochondria in situ in rat heart cells

1991 ◽  
Vol 69 (11) ◽  
pp. 1705-1712 ◽  
Author(s):  
Noburu Konno ◽  
K. J. Kako
Keyword(s):  
Hydrogen Peroxide ◽  
Membrane Potential ◽  
Mitochondrial Membrane Potential ◽  
Rat Heart ◽  
Mitochondrial Membrane ◽  
Isolated Rat Heart ◽  
Heart Mitochondria ◽  
High Concentrations ◽  
Isolated Rat

Hydrogen peroxide (H2O2) and hypochlorite (HOCl) cause a variety of cellular dysfunctions. In this study we examined the effects of these agents on the electrical potential gradient across the inner membrane of mitochondria in situ in isolated rat heart myocytes. Myocytes were prepared by collagenase digestion and incubated in the presence of H2O2 or HOCl. Transmembrane electrical gradients were measured by distribution of [3H]triphenylmethylphosphonium+, a lipophilic cation. The particulate fraction was separated from the cytosolic compartment first by permeabilization using digitonin, followed by rapid centrifugal sedimentation through a bromododecane layer. We found that the mitochondrial membrane potential (161 ± 7 mV, negative inside) was relatively well maintained under oxidant stress, i.e., the potential was decreased only at high concentrations of HOCl and H2O2 and gradually with time. The membrane potential of isolated rat heart mitochondria was affected similarly by H2O2 and HOCl in a concentration- and time-dependent manner. High concentrations of oxidants also reduced the cellular ATP level but did not significantly change the matrix volume. When the extra-mitochondrial free calcium concentration was increased in permeabilized myocytes, the transmembrane potential was decreased proportionally, and this decrease was potentiated further by H2O2. These results support the view that heart mitochondria are equipped with well-developed defense mechanisms against oxidants, but the action of H2O2 on the transmembrane electrical gradient is exacerbated by an increase in cytosolic calcium. Keywords: ATP, calcium, cardiomyocyte, cell defense, mitochondrial membrane potential, oxidant, triphenylmethylphosphonium.

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