Degradation of Auramine-O in Aqueous Solution by Ti/PbO2-Electro-Fenton Process by Hydrogen Peroxide Produced In Situ

Electrochemical removal of synthesis solution containing 50 mg/L auramine-O through Ti/PbO(2)electrodes and carbon felt air-diffusion electrode to in situ generate hydrogen peroxide (H2O2) by the oxygen (O-2) reduction. The effects of operating conditions, FeSO4 center dot 7H(2)O concentrations, current density, initial concentration, initial pH value and sodium sulfate (Na2SO4) concentration were investigated. For reaction of 60 min, the auramine-O removal rate reached 99% and total organic carbon (TOC) removal rate was close to 64.27%. This means that the organic macromolecules in the pollutants have been completely destroyed and broken down. The degradation of auramine-O under electro-Fenton (EF) process using Ti/PbO2-carbon felt was analyzed from the dimensions of TOC, mineralization current efficiency, energy consumption, degradation mechanism and kinetics. Comparing EF-Ti/PbO(2)with Ti/PbO(2)anode, AO (anodic oxidation)-Ti/PbO(2)anodic oxidation using Ti/PbO(2)anode and EF-Pt EF process with Pt anode, the consequences demonstrated that Ti/PbO2-EF process by hydrogen peroxide produced in situ was the best choice than others.

Automated summary

The electrochemical removal of organic dye Auramine-O from contaminated solution using Ti/PbO(2) electrodes and carbon felt air-diffusion electrode, in situ generating H2O2, achieved a high removal efficiency. Comparing with other anodic oxidation processes, the Ti/PbO2-EF process was proven to be the best choice in terms of efficiency and effectiveness.