Decolorization and Degradation of Methyl Orange Azo Dye in Aqueous Solution by the Electro Fenton Process: Application of Optimization

Abstract

In a batch reactor, the EF advanced oxidation decolorization of aqueous solutions of methyl orange MO, a commercial azo reactive textile dye, was investigated in the presence of two different electrodes. The evaluation included various operational variables such as the IC current intensity (60 mA, 80 mA, and 100 mA), initial concentration of pollutant MO (20 mg/L, 40 mg/L, and 60 mg/L), initial pH of solution (3, 5, and 7), temperature of solution (20 °C, 30 °C, and 50 °C), and initial concentration of catalyst [Fe2+] (0.1 mM, 0.2 mM, and 0.3 mM) on the discoloration rate. A Box-Behnken Design of Experiment (BBD) was used to optimize the parameters that directly affect the Electro-Fenton (EF) process. Under the optimal experimental conditions such as [Fe2+] = 0.232 mM, pH = 3, IC = 80 mA, [MO] = 60 mg/L, and T = 30 ± 0.1 °C, the maximum discoloration rate achieved was 94.9%. The discoloration of the aqueous MO solution during the treatment time was confirmed by analysis of the UV-visible spectrum. After a review of the literature on organic pollutant degradation, the EF system provided here is shown to be one of the best in terms of discoloration rate when compared to other AOPs.

Degradation of methyl orange by an ultrasonic Fenton-like process with Fe-based amorphous alloy powders

“…6d). Adachi et al 39 used the electro-Fenton method to decolorize 60 mg L −1 of MO under optimal conditions and achieved a 94.9% decolorization in 60 min. Shah 40 used α-Fe 2 O 3 as the catalyst to degrade MO by a photo-Fenton method.…”

Challenges and Future Roadmaps in Heterogeneous Electro-Fenton Process for Wastewater Treatment

“…The treatment performance of Fenton and associated processes is directly affected by process temperature. The temperature has a negative influence on the efficacy of heterogeneous electro Fenton process since the concentration of dissolved O 2 is reduced and the H 2 O 2 molecules are degraded at high temperatures (Adachi et al, 2022 ; Miao et al, 2020 ). In the study of the degradation of the azo dye cationic red X-GRL by the electro-Fenton process by an activated carbon fiber cathode, the optimum temperature was 60 °C where decoloration proportionally increased by increasing temperature and obtained performance of 93.46%.…”

New Margin-Based Biochar for Removing Hydrogen Sulfide Generated during the Anaerobic Wastewater Treatment

“…Thus, we find the products of metabolization and microbial bodies resulting from biological treatments (digestion, stabilization) [31]. The nature and concentration of organic and inorganic pollutants in wastewater depend on the activities connected to the network [33]. Most of the chemical contamination comes from industrial discharges and, to a lesser extent, from domestic discharges (use of solvents, do-it-yourself waste, detergent) [34].…”

“…Indeed, in the SEM pictures, we noticed that the material does not present any porosity and that the observed structure is relatively dense. The synthesized biochar has a low The nature and concentration of organic and inorganic pollutants in wastewater depend on the activities connected to the network [33]. Most of the chemical contamination comes from industrial discharges and, to a lesser extent, from domestic discharges (use of solvents, do-it-yourself waste, detergent) [34].…”