Preparation Of Mn Series Oxide Anodes And Experimental Study On Their Electrochemically Catalytic Oxidation Of Organic Pollutants

Electro-catalytic oxidation method as an effective organic wastewater treatmenttechnology, more and more attention in recent years, environmental workers. Giventhe central role of the anode material in the process of electro-catalytic oxidation oflow price and high performance and long life anode preparation has become a keyissue of electrochemical water treatment technology engineering applications.On the basis of previous work, we made Ti/MnO2electrode (electrodeⅠ),Ti/Sb+SnO2/MnO2electrode (electrodeⅡ) and Ti/Sb+SnO2+MnOX/MnO2electrode(electrodeⅢ) by the thermal decomposition and electrodeposition, meanwhile, bymeans of SEM, XRD, polarization curve, cyclic voltammetry, electrochemicalimpedance spectroscopy and accelerate the electrode life, we analyze theelectrochemical performance of them. The results show that: when the platingpressure is1.5v, plating temperature is60℃, the concentration of manganese sulfateis0.75mol/L,the microstructure of Ti/MnO2electrode surface is dense, smooth,uniform and the electric catalytic oxidation performance is supreme. Combining thelgi-η figure and Tafel formula of these three electrodes we can get when theelectrochemical reaction is in a state of balance, the surface exchange current densityi0of electrodeⅢ is the largest, explaining the highest surface catalytic performance.Through the cyclic voltammetry of three electrodes, we infer that: these threeelectrodes in neutral solutions is reversible reaction; integrating the Cycle volt-amperecurve of these three electrodes, known that electrode Ⅲ has the maximum Cyclicvoltammetry charge value, namely its real reaction area is the biggest, and shows itsbest electric catalytic oxidation activity. The Nyquist graph display that electrode Ⅲhas the smallest electrochemical reaction resistance so its electrode conductivity is thebest. Through contrast experiment, the accelerated life time ofTi/Sb+SnO2+MnOX/MnO2electrode is33h, converting to industrial lifetime is1.51a,compared to the Ti/MnO2electrode has a big enhancement. Finally, We use the threeelectrodes for phenol wastewater treatment, and examining the electrocatalytic effect,The result shows that: electrode Ⅲis above about31%than electrodeⅠ, above about8%than electrode Ⅱ in the removal rate of phenol. The degradation speed of CODfor electrode Ⅲis significantly faster than electrode Ⅱand electrodeⅠ.In the samecondition, the COD removal volume also increased significantly. For the reason, theelectrocatalytic performance of the electrode with intermediate is significantlyimproved after adding layer. Dynamics analysis shows that these three electrodes are dual phase control response in the degradation of phenol. Energy consumptioncomparison results show that the operating costs of Ti/Sb+SnO2+MnOX/MnO2electrode is the lowest, so it has great value for industrial application.