Three-Dimensional Electrochemical Oxidation of Recalcitrant Dye Using Green Iron Microparticles

Kothari, Manisha S.; Hassan, Ashraf Aly; Shah, Kosha A.

doi:10.3390/w13141925

Cited by 9 publications

(3 citation statements)

References 36 publications

(42 reference statements)

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“…At low pH (˂5), H 2 O 2 will gain a proton from the saturated H ions, producing H 3 O 2 (Equation ), which will decrease the effectiveness of H 2 O 2 (Faisal et al, 2020). For the higher pH values (>5), the increase in pH value resulted in a slight decrease in the removal percent of dye due to the decrease in the oxidation potential of OH• radicals and the dissolved portion of Fe (Kothari et al, 2021).

{normalH}_{2} {normalO}_{2} + {normalH}^{+} = {normalH}_{3} {normalO}_{3}^{+} .

…”

Section: Resultsmentioning

confidence: 99%

“…Historically, dye-containing wastewaters were treated utilizing various techniques such as adsorption, ion exchange, coagulation, chemical oxidation, bio-sorption, and other biological techniques | 53 (Kothari et al, 2021). However, all these techniques either produce sludge and/or generate secondary contaminants that may result in greater adverse effects than the initial contaminant itself.…”

Section: Introductionmentioning

confidence: 99%

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3D electrochemical technique with biowaste nano zerovalent iron granular electrodes for cationic dyes removal from aqueous solution

Alnasrawy

2022

Remediation Journal

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In this study, biowaste nano zerovalent iron (NZFe) was synthesized by a simple procedure from banana peel extract and was utilized, for the first time, as granular third electrodes in the 3D electrochemical system for cationic dyes removal. The aim of this study is to detect the efficacy of the synthesized biowaste NZFe as a granular third electrode for cationic dyes removal. The physical and chemical properties of the synthesized NZFe were determined using scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared, and Brunauer–Emmett–Teller surface area analysis. An electrochemical cell with graphite as anode and stainless steel as cathode was used. A 3D electrochemical system with NZFe as granular third electrodes was found to be more efficient than a 2D electrochemical system for removing cationic dyes from an aqueous solution. The highest removal rates of methyl green and basic blue 41 under the optimum operating conditions (NZFe dose of 2 g/L, pH of 5, electrolysis time of 35 min, 0.3 g/L [Na2SO4], current density of 50 mA/cm2, and dye concentration of 100 mg/L) were 98.8% and 97.1%, respectively. The potential mechanism of the removal of cationic dyes utilizing the 3D electrochemical system with the NZFe as granular third electrodes was proposed.

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{normalH}_{2} {normalO}_{2} + {normalH}^{+} = {normalH}_{3} {normalO}_{3}^{+} .

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D electrochemical technique with biowaste nano zerovalent iron granular electrodes for cationic dyes removal from aqueous solution

Alnasrawy

2022

Remediation Journal

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“…The two main mechanisms that can be applied are the direct and indirect oxidation. Direct oxidation is performed in the electrode surface whereas the indirect oxidation requires that oxidation species are electrogenerated and then react in an aqueous solution [8,9].…”

Section: Introductionmentioning

confidence: 99%

Use of Electrooxidation as a Polishing Step for the Residual Water Obtained in a Solar Wastewater Treatment

Tarango-Brito,

Ramos-García,

Ávila-Córdoba

et al. 2023

J. Mex. Chem. Soc.

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Abstract. Dyes are widely used in many industrial operations for a variety of products; however, when wastewater is discharged without a treatment in rivers and lakes, severe environmental impacts are observed. In this work, the results of a solar wastewater treatment are presented. The solar treatment consists in parabolic heater coupled with a solar distiller which contains a ZnO plate that works as photocatalyst. Distilled water presents good characteristics; nevertheless, a residue that contains dye and intermediate products is also obtained. An electrooxidation treatment using boron-doped diamond electrodes (BDD), is applied at the residue as a polishing step. It was observed that wastewater quality improves when using an aqueous solution of pH 2.7 and a current density of 22.2 mA cm-2. Physicochemical test such as COD, and UV-Vis were used to evaluate the wastewater quality. It was found that 40 minutes are required to attain the improvement. This technology is environmental friendly since low energy is required (5 kW h L-1). Resumen. Los colorantes son ampliamente utilizados en la industria para una gran variedad de productos; cuando se descargan aguas residuales con dichos compuestos en ríos o lagos, ocasionan severas afectaciones al medio ambiente. Este trabajo presenta los resultados obtenidos al someter agua sintética a un proceso consistente en un calentador acoplado a un destilador solar que contiene un fotocatalizador. En dicho procedimiento se obtiene agua destilada de buena calidad, sin embargo, también se genera un agua residual concentrada con presencia de colorante y productos intermediarios. A manera de pulimento se aplica la electrooxidación empleando electrodos de diamante dopados con boro. Con las mejores condiciones: pH 2.7 y densidad de corriente de 22.2 mA cm-2, se encuentra que el agua residual presenta una notable mejoría en características fisicoquímicas de DQO y espectroscopia UV-Vis. Se encontró que es necesario un periodo de tiempo de 40 minutos para mejorar las características del agua concentrada, lo cual hace que este proceso sea ambientalmente amigable, ya que requiere la aplicación de poca energía (5kW h L-1).

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Removal of pharmaceutical residues in 2D and 3D electrochemical processes by using orange peels

Al-Kindi

Al-Haidri

2023

Innov. Infrastruct. Solut.

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Three-Dimensional Electrochemical Oxidation of Recalcitrant Dye Using Green Iron Microparticles

Cited by 9 publications

References 36 publications

3D electrochemical technique with biowaste nano zerovalent iron granular electrodes for cationic dyes removal from aqueous solution

3D electrochemical technique with biowaste nano zerovalent iron granular electrodes for cationic dyes removal from aqueous solution

Use of Electrooxidation as a Polishing Step for the Residual Water Obtained in a Solar Wastewater Treatment

Removal of pharmaceutical residues in 2D and 3D electrochemical processes by using orange peels

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