Removal of Dyes from Waste Solutions by Anodic Oxidation on an Array of Horizontal Graphite Rods Anodes

Abdel‐Aziz, M.H.; Bassyouni, M.; Zoromba, Mohamed Shafick; Alshehri, Abdullah

doi:10.1021/acs.iecr.8b05291

Cited by 42 publications

(16 citation statements)

References 75 publications

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“…The sn values shown in Table 1 are one order of magnitude lower in comparison with 1.76 m 3 m -3 h -1 obtained for the 88% of MB decolouration by using an initial MB concentration of 100 mg dm -3 at 42.55 mA cm -2 in a cell with graphite as anode and stainless steel as cathode [71]. This may be due to the large volume of the electrolyte (300 cm 3 ) in comparison to the small electrode area (1 cm 2 ) employed.…”

Section: Time / Minmentioning

confidence: 74%

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

Lacasa

Cañizares

Walsh

et al. 2019

Electrochimica Acta

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Textile industries generate large volumes of wastewater containing organic dyes, which may be hazardous to the environment and human health. In this work, the oxidation of 100 mg dm-3 of methylene blue (MB) in aqueous solutions was studied using H2O2 (formed in-situ) at gas diffusion electrodes (GDEs) in the presence of 1 × 10-3 mol dm-3 Fe 2+ catalyst, to create hydroxyl radicals to facilitate Fenton oxidation. The influence of applied potential (-0.5 to-1.3 V vs. Ag/AgCl) at different oxygen flow rates to the GDE (0.15-0.45 cm 3 min-1) and different counter electrode materials (Pt mesh, Ni mesh, RVC) was investigated. MB was completely degraded to a residual concentration below the detection limit of 0.5 mg dm-3. The rate and degree of mineralisation were significantly influenced by the applied potential. A maximum mineralisation of 88.2% was achieved at-1.0 V vs. Ag/AgCl. The oxygen flow rate to the GDE did not influence the degradation of MB under the experimental conditions. The counter electrode material affected the degree of mineralisation in the order Pt mesh > reticulated vitreous carbon (RVC) > Ni mesh. The apparent first order rate decay constant for MB degradation and MB mineralisation was calculated to have a maximum value of 0.0182 min-1 for MB mineralisation at a potential of-1.0 V vs. Ag/AgCl.

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Section: Time / Minmentioning

confidence: 74%

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

Lacasa

Cañizares

Walsh

et al. 2019

Electrochimica Acta

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“…However, only 53% of the Cr(VI) removed at the lowest rpm and on using 2 g of iron powder. This trend is attributed to an increase in the diffusion rate of Cr(VI) solution, as rpm increases, which decreases the diff usion layer thickness on iron powder and increases iron reactivity [Abdel-Aziz et al, 2018].…”

Section: Eff Ect Of Rotation Speedmentioning

confidence: 97%

A Novel Rotating Fixed Bed Batch Reactor for Hexavalent Chromium Reduction

Sayed¹,

Alturki²,

Farag³

et al. 2022

J. Ecol. Eng.

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Hexavalent chromium reduction using iron powder has the advantages of being efficient and capable of degrading pollutants, as well as inexpensive and simple to procure. The performance of a new rotating fixed-bed batch reactor in treating aqueous solutions containing chromium hexavalent ions with iron powder was investigated. Two magnets were covered with iron powder and coupled with an isolated stainless-steel shaft in a new agitator design. Variables such as time, initial hexavalent chromium content, iron powder dose, rotational speed, and pH were investigated in order to discover the optimum chromium removal approach. The analysis of variance (ANOVA) was used to determine the experimental kinetics. Contact time of 21 minutes, initial Cr(VI) concentration of 30 ppm, iron powder dosage of 10 g, rpm of 276 and pH of 3 were determined to be the optimal conditions for removing hexavalent chromium.

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“…Maximum color removal efficiency was obtained after 70 minutes of electrolysis at 79 mA.cm −2 current density. Abdel-Aziz et al [32] reported the anodic oxidation of methylene blue (50 ppm) azo dye on graphite anode in aqueous (2.5 g.L −1 NaCl) solution at pH 3.0. A maximum color removal of 94% was achieved after 30 min treatment time at 42.55 mA.cm −2 current density.…”

Section: Graphitementioning

confidence: 99%

Electrode material in electrochemical decolorization of dyestuffs wastewater: A review

et al. 2021

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Tеxtile wastewater contains a variety of contaminants that are known to be hazardous. Synthetic dyes are one of the hazardous pollutants in the textile industry that are resistant to the photo/bio dеgradation. They cannot be dеstroyed under conventional wastewater treatment. This document presents a review on the electrochemical treatment of wastеwater containing synthetic organic dyes by anodic oxidation for environmental protection. The mechanisms of еlectrochemical oxidation in anodic oxidation processes are well explained. A largе number of electrodes have been tested by this method. Therefore, this papеr aims to summarize and discuss the most important and rеcent results available in the literature on anode application for the rеmoval of synthetic dyestuffs. Finally, the prospects of the process for futurе research are suggested.

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Removal of Dyes from Waste Solutions by Anodic Oxidation on an Array of Horizontal Graphite Rods Anodes

Cited by 42 publications

References 75 publications

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

Removal of methylene blue from aqueous solutions using an Fe2+ catalyst and in-situ H2O2 generated at gas diffusion cathodes

A Novel Rotating Fixed Bed Batch Reactor for Hexavalent Chromium Reduction

Electrode material in electrochemical decolorization of dyestuffs wastewater: A review

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