Design Of Parallel Connection Between Acetylene Black-PTFE Composite Cathode And Fe₃O₄ Cathode And The Research Of Electrolytic Dye Wastewater

In order to overcome the disadvantages in traditional electro-fenton reaction such as large amounts of iron sludge will developed in acid environment, the cost of H₂O₂ is high and not easy to store and transport. In this study, we developed a new single chamber E-Fenton system with two cathodes: acetylene black cathode and Fe₃O₄ cathode, in parallel connection and an anode. The acetylene black-PTFE electrode and Fe₃O₄ electrode were prepared by the combination of physical and chemical methods in first. The acetylene black cathode was used for the electro-generation of H₂O₂ and the Fe₃O₄ cathode was used for the initiation of heterogeneous Fenton reaction ≡Fe（II） + H₂O₂→≡Fe（III） + ?OH + OH^- and the in situ reduction of ≡Fe（III） back to ≡Fe（II）, realizing the in situ recycling of iron species.The electrode materials were characterized by the application of X-ray, TEM and SEM. The results indicate that the electrode materials have good dispersivity,the agglomeration is not obvious and the prepared electrode surface morphology of the materials have not changed by calcining, which is good for improving the electro-catalytic performance of the electrode.In order to prove the fact that double cathode have better electro-catalytic activity, at ambient temperature, we do experiment using RhB and congo red dye. The results indicated that in RhB solution, only when the Fe₃O₄ cathode and acetylene black-PTFE cathode parallel composition of electro Fenton system exhibited electrocatalytic effect is the best. In the RhB dye,the degradation efficiency is 89.7% at 554 nm. The results also influenced by the mixture radio of Fe₃O₄ and PTFE, voltage, pH, and the initial concentration of organic dye. In addition, the performance of paralleled acetylene black cathode and Fe₃O₄ cathode is better than adding single Fe₃O₄ powder or single hydrogen peroxide when degrading organic dye. And the parallel double cathode is stable, which can use recycle more than twenty times.Furthermore, for the sake of further confirmation parallel doubled cathode have better degradation efficiency, using the same single factor method, we also investigated it on congo red solution, and the degradation is 85.9% at 498 nm. Above all, the parallel double cathode have better stability and electro-catalytic activity, using it on wastewater is feasible.