Effect of electro‐Fenton application on azo dyes biodegradability

Elias, Bashir; Guihard, L.; Nicolas, Stéphane; Fourcade, Florence; Amrane, Abdeltif

doi:10.1002/ep.10457

Cited by 20 publications

(7 citation statements)

References 49 publications

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“…The oxidation using Fenton reagent is not appropriate as a post-treatment application [88]. It is a useful process for getting rid of organic pollutants/toxic chemicals, which are detrimental to biological treatments [86,94,114,115]. It is appropriate to apply Fenton process prior to treatment than after treatment as the Fe ion quantity has to be increased for the complete removal of the dye, since there is iron precipitation due to the phosphate ion, as a macronutrient present in microbiological media.…”

Section: Microbiological Dye Degradation Processes In Combination Wit...mentioning

confidence: 99%

Role of Various Physicochemical Factors in Enhancing Microbial Potential for Bioremediation of Synthetic Dyes

Birmole¹,

Samudravijay²

2022

Environmental Sciences

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The Indian dye industry is globally recognized for production and export of every known class of dye. On the less attractive side of industrialization, they contribute considerably to environmental pollution. The dyes discarded by industries persist in the environment due to extremely slow rate of biodegradation. Moreover, these dyes are toxic to insects, birds and terrestrial life. The dyes also hamper the light penetration in water bodies, severely affecting the the process of photosynthesis. In spite of the problems associated with synthetic dye disposal, they are industrially preferred due to their fundamental requirement in enhancing overall appearance of goods, quality and cost effectiveness. Several studies have reported physicochemical techniques for remediation of dye effluents. Most of these techniques pose significant drawbacks due to their high energy and cost requirements. The bioremediation approach, on the other hand, offers advantages of sustainable environmental friendly processes to detoxify and degrade dyes into harmless products. This chapter provides an overview of the potential role of various physicochemical factors such as pH, temperature, oxygen and nutrient concentration in optimum decolorization of dyes by naturally isolated microbial strains. In addition, the role of cosubstrates, electron acceptors and microbial enzymes are also discussed.

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Section: Microbiological Dye Degradation Processes In Combination Wit...mentioning

confidence: 99%

Role of Various Physicochemical Factors in Enhancing Microbial Potential for Bioremediation of Synthetic Dyes

Birmole¹,

Samudravijay²

2022

Environmental Sciences

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“…3. UV-Vis spectra of four samples: synthetic wastewater, conventional fenton method, electro-fenton method (with HEA anode and graphite cathode), and electro-fenton method (with graphite rods) caused by the azo bond "N = N" [21,24]. The increase of the reaction of time would decrease the intensity of absorption peak which is proportional to the concentration of azo dye solution.…”

Section: Characterizationmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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Azo dye is widely used in the textile industry since it is cost effective and simple to use. However, it becomes a continuous source of environmental pollution due to its carcinogenicity and toxicity. Various methods had been used to remove the azo dye in solution. one of the famous and frequently used is the fenton process. The fenton process is one of the advanced oxidation processes where iron catalysed hydrogen peroxide to generate hydroxyl radical. Treating azo dyes in solution requires a catalyst to enhance the process of degradation. Herein, high entropy alloys (HEAs) have been proposed as a catalytic material to enhance the performance of fenton process for azo dye degradation. HEAs have been reported as a promising catalyst due to its high surface area. The higher the number of active sites, the higher the rate of azo dye degradation as more active sites are available for adsorption of azo dyes. The results have shown that HEAs can be used as a catalyst to fasten the fenton reaction since the degradation time is proven to be shorter in the presence of HEAs. The method derived from the result of this study will contribute in treating azo dyes for wastewater management in the fenton process.

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“…AO7 is widely used for dyeing natural fibers like cotton, silk and wool, silk and cotton, and synthetic fibers like acrylics and polyesters. It has been typically employed as model pollutant to investigate the decolorization and mineralization of azo dyes by different chemical, photochemical, and photocatalytic AOPs [37][38][39][40][41] and EAOPs like EF and PEF [16,33,[42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Solar Photoelectro-Fenton Degradation of Acid Orange 7 Azo Dye in a Solar Flow Plant: Optimization by Response Surface Methodology

Brillas

Garcia‐Segura

2016

Water Conserv Sci Eng

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The experimental variables to optimize the solar photoelectro-Fenton (SPEF) degradation of 10 L of Acid Orange 7 (AO7) azo dye in 0.05 M Na 2 SO 4 of pH 3.0 have been determined from a central composite rotatable design and response surface methodology. Trials were performed with a solar flow plant with a Pt/air-diffusion reactor generating H 2 O 2 and a solar compound parabolic collector photoreactor under an UV irradiation intensity of about 31 W m −2. Optimum variables of 4.0 A, 0.75 mM Fe 2+ , and 150 mg L −1 total organic carbon (TOC) of the azo dye were found for 90 % color and 70 % TOC removals. Under optimized conditions, total decolorization was achieved in 300 min, but AO7 decay obeyed a pseudo-first-order kinetics to disappear in 80 min, pointing to the generation of recalcitrant colored aromatic products. After 360 min of electrolysis, TOC was reduced by 96 %, with 64 % mineralization current efficiency and 133 kWh kg −1 TOC energy consumption. The final solution contained carboxylic acids like tartronic, oxalic, oxamic, and in larger proportion, formic. An almost total mineralization was achieved by SPEF due to the persistence of Fe(III)-formate complexes to be photolyzed by sunlight. The initial N of the azo dye was mainly released as NH 4 + .

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Effect of electro‐Fenton application on azo dyes biodegradability

Cited by 20 publications

References 49 publications

Role of Various Physicochemical Factors in Enhancing Microbial Potential for Bioremediation of Synthetic Dyes

Role of Various Physicochemical Factors in Enhancing Microbial Potential for Bioremediation of Synthetic Dyes

Archives of Metallurgy and Materials

Solar Photoelectro-Fenton Degradation of Acid Orange 7 Azo Dye in a Solar Flow Plant: Optimization by Response Surface Methodology

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