Application of self-supplying iron cathode prepared by gas sludge in Electro-Fenton

This study is a new method for recovery and utilization of waste gas sludge from iron and steel industry. Because the gas sludge contains iron and carbon elements, the gas sludge is prepared into an Electro-Fenton (E-Fenton) cathode in this study. In this paper, the gas sludge was treated at high temperature to prepare the electrode. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the gas sludge to determine the valence state of iron. The linear voltammetry curve was swept for the gas sludge electrode. The degradation effect of azo dye X3B was more than 90% in 25 min. The dissolution of total Fe and Fe2+, the formation of hydrogen peroxide (H2O2) andiron hydroxyl radicals (·OH) were also detected. The results show that there is an E-Fenton reaction in the process of gas sludge cathodic degradation of X3B.