Abstract
Due to the fact that Iron oxide (Fe2O3) is known to have a good effect on the photochemical reaction of catalysts, an investigation in this study into the enhancement of the degradation performance of bio-electro-Fenton microbial fuel cells (Bio-E-Fenton MFCs) was carried out using three photocatalytic cathodes. These cathodes were produced at different calcination temperatures of Fe2O3 ranging from 500 °C to 900 °C for realizing their performance as photo catalysts within the cathodic chamber of an MFC, and they were compared for their ability to degrade oily wastewater. Results show that a suitable temperature for the calcination of iron oxide would have a significantly positive effect on the performance of Bio-E-Fenton MFCs. An optimal calcination temperature of 500 °C for Fe2O3 in the electrode material of the cathode was observed to produce a maximum power density of 52.5 mW/m2 and a chemical oxygen demand (COD) degradation rate of oily wastewater (catholyte) of 99.3% within one hour of operation. These novel findings will be useful for the improvement of the performance and applications of Bio-E-Fenton MFCs and their future applications in the field of wastewater treatment.
Highlights
The Bio-Electro-Fenton Microbial Fuel Cells (Bio-E-Fenton MFCs) is a new framework and has been operated extensively because of its simultaneous wastewater treatment and power generation capability.Significantly, the electro-Fenton reaction consists of iron ions (Fe2+ ) and hydrogen peroxide, and has become a useful technology for treating organic pollutants in wastewater [1,2,3,4,5,6,7,8,9,10] as hydroxyl radicals (OH)are generated in abundance within the electro-Fenton reaction [11]
Each chamber had a total volume of 200 mL with a proton exchange membrane Nafion-117 (80 mm × 70 mm) and carbon felt (CF, 60 mm × 60 mm × 5 mm) as the anode and cathode electrodes, respectively
The study demonstrated that industrial effluents from agrifood facilities which time the anodic chamber was fed with dairy wastewater and the cathodic chamber with an can be treated by bio-electrochemical systems (BESs) with >85% organic matter removal
Summary
The Bio-Electro-Fenton Microbial Fuel Cells (Bio-E-Fenton MFCs) is a new framework and has been operated extensively because of its simultaneous wastewater treatment and power generation capability. The first step 1 in the cathode reaction: 2H+ + 2e− + O2 → H2 O2 (1–1), resulted in H2 O2 accumulation in the cathode chamber via the two-electron reduction of dissolved O2 in the Bio-E-Fenton MFCs and FeSO4 powder was added as a source of Fe2+ : 2H+ + Fe → Fe2+ + H2 (1–2); the second step. The cathode in Bio-E-Fenton MFCs because the photo catalysis of Fe2O3 can produce hydroxyl radicals [11] It can further combine with FeSO4 to act as an iron source with H2O2 for producing more hydroxyl radicals (OH), resulting in a higher degradation rate within a short time.
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