Kinetics and mechanism of oxidative decomposition of Congo red by Fenton’s reagent and its synergic effects on exposure to UV radiation

Congo red is a toxic azo dye which is used extensively in industries like textile, paper, pulp and paper. Very high amount of Congo red from these industrial sources is discharged into natural water bodies resulting environmental pollution. The present work reports the kinetics and mechanism of oxidative decomposition of Congo red by Fenton’s reagent in homogeneous medium and also under ultra violet light irradiation. Kinetic parameters like effect of [Fe2+], [H2O2], [Congo red] and temperature on the decomposition of Congo red were studied. The reaction is found to be fractional order with [Fe2+] and first order with [H2O2] and [Congo red]. The rate of oxidative decomposition of Congo red by Fenton’ reagent showed a rapid increase of three times when irradiated with ultra violet radiation and completion of reaction occurred within 5-6 minute. Various thermodynamic variables were determined and the presence of isosbestic points on sequential scanning of oxidation kinetics proves that the reaction is very smooth, spontaneous and endothermic. A suitable mechanism is suggested based on the experimental results obtained.

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Biogas production in the methane fermentation of excess sludge oxidized with Fenton’s reagent

E3S Web of Conferences ◽

10.1051/e3sconf/201911600104 ◽

2019 ◽

Vol 116 ◽

pp. 00104

Author(s):

Iwona Zawieja ◽

Kinga Brzeska

Keyword(s):

Fermentation Process ◽

Biogas Production ◽

Process Conditions ◽

Oh Radicals ◽

Fenton’S Reagent ◽

Iron Ions ◽

Fenton Reagent ◽

Excess Sludge ◽

Methane Fermentation ◽

Fenton's Reagent

The advanced oxidation processes (AOPs) play an important role in the degradation of hardly decomposable organic pollutants. AOPs methods rely on the production of highly reactive hydroxyl OH• radicals. The aim of the conducted research was to intensify biogas production in the methane fermentation process of excess sludge subjected to the process of deep oxidation with Fenton's reagent. In the process of oxidation of sewage sludge with the Fenton reagent, doses of iron ions in the range 0.02–0.14 g Fe2+/g TS (total solids) were used Hydrogen peroxide was measured in the proportions 1: 1–1:10 in relation to the mass of iron ions. The basic substrate of the study was excess sludge. In the case of excess sludge oxidation with the use of Fenton's reagent, the most favorable process conditions were considered to be the dose of iron ions 0.08 g Fe2+/g d.m. and a Fe2+: H2O2 ratio of 1:5. As a result of subjecting the excess sludge to disintegration with the Fenton reagent in the above-mentioned dose, with respect to the fermentation process of unprocessed sludge, about two-fold increase in the digestion degree of excess sludge and about 35% increase of the biogas yield was obtained.

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Decolorization of Congo red via hydrodynamic cavitation in combination with Fenton’s reagent

Chemical Engineering and Processing - Process Intensification ◽

10.1016/j.cep.2020.107874 ◽

2020 ◽

Vol 150 ◽

pp. 107874 ◽

Cited By ~ 5

Author(s):

Zahra Askarniya ◽

Mohammad-Taghi Sadeghi ◽

Soroush Baradaran

Keyword(s):

Congo Red ◽

Hydrodynamic Cavitation ◽

Fenton’S Reagent ◽

Fenton's Reagent

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Performance Evaluation of Fenton Oxidation Treatment Method for the Reuse of Reactive Dyeing Effluent

Journal of the chemical society of pakistan ◽

10.52568/000829/jcsp/41.06.2019 ◽

2019 ◽

Vol 41 (6) ◽

pp. 1138-1138

Author(s):

Sana Islam Sana Islam ◽

Irfan Ahmed Shaikh Irfan Ahmed Shaikh ◽

Nabeela Firdous Nabeela Firdous ◽

Azhar Ali and Yumna Sadef Azhar Ali and Yumna Sadef

Keyword(s):

Optimal Dose ◽

Treatment Method ◽

Quality Parameters ◽

Fenton’S Reagent ◽

Fenton Reagent ◽

Color Strength ◽

Fenton's Reagent ◽

Reactive Dyeing ◽

Wash Fastness ◽

Reactive Orange

In this study, a novel wash-off method was investigated wherein the use of Fenton’s reagent was evaluated to get rid of hydrolyzed and unfixed reactive dyes from wash-off liquor and reused in next wash-off process. After dark shade dyeing (5% o.w.f) with C.I. Reactive Blue 72, C.I. Reactive Blue 221, C.I. Reactive Red 141, C.I. Reactive Red 198, C.I. Reactive Orange 84, C.I. Reactive Orange 122, C.I. Reactive Yellow 105 and C.I. Reactive Yellow 138 , fabrics were subjected to both clean water (reference) and treated wash-off liquors (batch) and comparisons were made. Fenton reagent was proved capable to achieve 88-97% color reduction in wash-off liquor at pH 3 by using optimal dose of FeSO4 and H2O2 at room temperature. Then effectiveness of Fenton’s reagent treated wash-off was evaluated in terms of color difference values (ΔL*, ΔC*, Δh* and ΔE*), wash fastness and crocking properties. For color fastness properties the commercially tolerable value of ΔE*≤1 was observed for blue and red dyes and slightly higher value for yellow and orange dyes. Wash fastness and crocking results are almost similar for reference and batch dyed fabrics and their values ranges 4-5 on grey scale. Color strength (K/S) showed negligible difference in values indicating that fabrics absorbed almost same amount of dyestuff for each dye .Fenton method of treatment proved to be an eco-friendly and economically feasible treatment method and treated liquor can be effectively used in next dyeing, without compromising quality parameters.

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Kinetics and Mechanism of Benzene Derivative Degradation with Fenton's Reagent in Aqueous Medium Studied by MIMS

The Journal of Physical Chemistry A ◽

10.1021/jp983256o ◽

1998 ◽

Vol 102 (52) ◽

pp. 10723-10727 ◽

Cited By ~ 56

Author(s):

Rodinei Augusti ◽

Adelson O. Dias ◽

Lilian L. Rocha ◽

Rochel M. Lago

Keyword(s):

Aqueous Medium ◽

Kinetics And Mechanism ◽

Benzene Derivative ◽

Fenton’S Reagent ◽

Fenton's Reagent

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Oxidation and mineralisation of substituted phenols by Fenton's reagent and catalytic wet oxidation

Water Science & Technology ◽

10.2166/wst.2007.375 ◽

2007 ◽

Vol 55 (12) ◽

pp. 37-45

Author(s):

A. Santos ◽

S. Rodriguez ◽

F. Garcia-Ochoa ◽

P. Yustos

Keyword(s):

Activated Carbon ◽

Fixed Bed ◽

Fixed Bed Reactor ◽

Wet Oxidation ◽

Fenton’S Reagent ◽

Catalytic Wet Oxidation ◽

Fenton Reagent ◽

Substituted Phenols ◽

Fenton's Reagent ◽

Catalytic Systems

Catalytic abatement of solutions of 1,000 mg/L in phenol, ortho and para nitrophenol and ortho and para cresols was acomplished by using two catalytic systems. Fenton's reagent was used at 50 °C by adding 10 mg/L of ferrous cation and different dosages of H2O2. The mixture was reacting isothermically in a batch way during 3 hours. Catalytic wet oxidation (CWO) was carried out by using a commercial Activated Carbon, Industrial React FE01606A, CWO runs were carried out in a fixed bed reactor (FBR) with concurrent upflow. Temperature and oxygen pressure of the reactor were set to 160 °C and 16 bar, respectively. While phenols are quicky oxidised by the Fenton reagent higher mineralisation was obtained in the CWO process.

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Green Synthesis of Copper Oxide Nanoparticles using Cucumis sativus (cucumber) Extracts and their Bio-physical and Biochemical Characterization for Cosmetic and Dermatologic Applications

Endocrine Metabolic & Immune Disorders - Drug Targets ◽

10.2174/1871530320666200705212107 ◽

2020 ◽

Vol 20 ◽

Author(s):

Monika Vats ◽

Shruti Bhardwaj ◽

Arvind Chhabra

Keyword(s):

Copper Oxide ◽

Green Synthesis ◽

Biochemical Characterization ◽

Chemical Characterization ◽

Ultra Violet ◽

Skin Penetration ◽

Copper Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Ultra Violet Radiation ◽

Anti Fungal

Background & Objective: Nanoparticles are used in cosmetic and dermatologic products, due to better skin penetration properties. Incorporation of natural products exhibiting medicinal properties in nano-preparations could significantly improve efficacy of these products and improve the quality of life without the side effects of synthetic formulations. Methods: We here report green synthesis of Copper Oxide nanoparticles, using Cucumber extract, and their detailed biophysical and bio-chemical characterization. Results: These Copper Oxide-Cucumber nanoparticles exhibit significant anti-bacterial and anti-fungal properties, Ultra Violet-radiation protection ability and reactive-oxygen species inhibition properties. Importantly, these nanoparticles do not exhibit significant cellular toxicity and, when incorporated in skin cream, exhibit skin rejuvenating properties. Conclusion: Our findings have implications for nanoparticle-based cosmetics and dermatologic applications.

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