The Preparation Of ACF@OMC Cathode And DSA Anode And Their Application On E-Fenton Techonology

As one of the most important advanced oxidation techonolgy (AOT), E-Fenton reactionhas been used as an alternative method for the degradation of organic pollutants in water. In aconventional Fenton reactions, hydroxyl radicals (OH), resulted from the reaction betweenhydrogen peroxide and ferrous ion, is considered to be the main reactive species for theoxidation and mineralization of various organic pollutants in water. In this process, hydrogenperoxide was electro-generated by reduction of air (O2) on a gas diffusion cathode. However,because of the low solubility and slow mass transport (gas diffusion) of oxygen in the aqueoussolution, the reduction of oxygen to form hydrogen peroxide with a high yield happens onlyon certain cathode materials. The properties of cathodic material are of great importance onthe efficiency of E-Fenton system.In this paper, a new kind of oxygen-fed gas diffusion cathode material (ACF@OMC),activated carbon fibers (ACF) grafted by ordered mesoporous carbon (OMC), was preparedby developing a lay of OMC on the walls of ACF. Chapter two depicts the result ofACF@OMC which characterized by scanning electron microscopy (SEM), transmissionelectron microscopy (TEM) and nitrogen adsorption–desorption isotherms. The function ofACF@OMC cathode material was evaluated by Electro-Fenton (E-Fenton) degradation ofbrilliant red X3B (X3B). The results suggest the overwhelmingly better performance ofACF@OMC than that of ACF and ACF@DMC (ACF grafted by a layer of disorderedmesoporous carbon). The structural properties of the mesoporous ACF@OMC composite arestrongly related to its excellent performance. More over, ACF@OMC cathode material is verystable, which is highly promising in practical applications such as energy storage andcatalysis.Chapter three illustrates the impact of calcine temperature on the structure ofACF@OMC, three different kind of ACF@OMC which dealed with various temperature wereused as the cathode of E-Fenton system to degrade X3B and Acidic orange respectively. Theresult suggested that temperature of calcination has a significant impact on the structure ofACF@OMC, and different cathode with different structure has disparate efficiency on thedegradation of the same dye. Except that, the diversities of the degradation behavior betweenX3B and Acidic orange reflect that both of the structure information of molecular and thestructure of cathode play a great influence on the degradation behavior of the dye. Chapterfour used Ti-base SnO2electrode with nano coating (DSA) which prepared by sol-gel methodas anode material and the cathode was the activated carbon fiber(ACF),constituting withgraphite paper(GE) electrode formed three different group of electrodes couples that appliedto degrade X3B by electro-fenton method, respectively. The degradation effects was evaluedby calculating decoloration and mineralization rate of the various three electrode couples.The results showed that different electrode couple has different decolorization and mineralizationrate.SEM images displayed that ACF had nanowire structure and the chemical structure ofACF and DSA were stable. The SnO2and Sb2O5crystal which on the surface of DSA hadtetragonal rutile structure that was investigated from the XRD result.The CV curves of threegroups of electrodes implied that the anodic oxidation of the electrodes in Electro-Fentonsystem was not found. The result of.OH detection indicated that DSA anode could promotethe decomposition of H2O2to be hydroxyl radical.