Preparation And Performance Test Of DSA Electrode

The DSA electrode is a kind of electrode with titanium as the substrate and metal oxide as the active layer.It was widely used in metallurgical industry and environmental protection industry. In the metallurgical industry, the Cl^- is relatively high in the electroplating solution, the anion is moving towards the anode, and the cation is moving towards the cathode. At the anode,the material with lower separation potential is preferentially precipitated,and the material with higher separation potential is preferentially precipitated at the cathode.According to these principles, the chlorine gas is preferentially separated from the oxygen. The anode can not only pollute the environment, but also affect the quality of the electroplating products. Ti/IrRu electrode is used wildly and the preparation cost is high. Therefore, it is needed to prepare a kind of strong catalytic ability of oxygen evolution, and lower cost.In the environmental protection industry Industrial wastewater is difficult to treat with the conventional approach containing when containing cyclic organic compounds.when using electrochemical water treatment process, organic pollutants is good treated effectly due to the anode with high oxygen evolution potential can produce ?OH. so these anodes is widely used in electrochemical water treatment process.In this paper, Ti is the matrix,the electroplating solution is SnCl₄, 4H₂O and SbCl₃ mixed solution and the preparation technology is electro deposition the Active layer of electrode Ti/SnO₂+Sb₂O₃/MnO_X is made by thermal decomposition method, coating liquid is a certain concentration of Mn?NO3? 2 solution, Then the Ti/SnO₂+Sb₂O₃/MnO_x +RuOY electrode is made by adding Ru element in the active layer. The Oxygen evolution activity and electrochemical stability of electrodes are investigated by changing the preparation temperature of the middle layer and the active layer, Coating amount of active layer and the ratio of Mn and Ru in the active layer, and the preparation parameters are optimized.The electrodes are tested by using cyclic voltammetry?CV? and linear scanning?LSV?, open circuit voltage method. Electrode morphology is tested by microscope.Finally,the Ti/SnO₂+Sb₂O₃ electrode is used to degradate phenol wastewater Removal rate of Phenol and COD are tested by changing the concentration of electrolyte, pH of the solution, temperature of solution, current density and the initial concentration of phenol.Research shows that:? 1? electrode of Ti/SnO₂+Sb₂O₃/MnO_X has better oxygen evolution catalytic performance and electrochemical stability when the preparation of the intermediate layer temperature is 500 degrees centigrade.Because the crystal can fully developed.?2?The oxygen evolution activity and the conductivity of the electrode of Ti/SnO₂+Sb₂O₃/MnO_X are enhanced when the active layer of preparation temperature 400?,because the oxide crystals of active layer are mainly ?-Mn₂O₃and?-MnO₂.?3?The electrode performance is good when coating quantity of the active layer is the 34g/?.?4?The oxygen evolution potential and electrochemical stability of Ti/SnO₂+Sb₂O₃/ MnO_x+RuOY electrodes are good when the active layer of preparation temperature is 400? and Ru element is added to the Mn?NO₃?₂ solution.As active layer and the intermediate layer formed a good solid solution.?5?The optimal ratio of Mn:Ru in the active layer is 100:1.?6?After the incorporation of Ru into the active layer, the oxygen evolution potential of the electrode is decreased and the stability of the electrode is improved.?7?It shows that electrolyte concentration, Solution temperature and current density are positively correlated on phenol and COD removal rate; The removal rate of phenol and COD is the best When the pH value is about 7;Phenol and COD removal rate decrease when phenol initial concentration gradually increase.