Preparation Of Activated Carbon Supported Metal Oxide As Particulate Electrode And The Electro-catalytic Performance For Phenol Degradation

Electrochemical treatment process in Packed-bed has been hoped great water treatment technology by environmental workers. The preparation of the fillings in bed is one of the main research directions of this technology, especially a comprehensive evaluation and an inquiry of mechanism of oxidation for organic for particle electrode which loaded with metal oxide in carbon, will provide the basis for choosing carbon loaded metal oxide. Based on this, the present study was prepared the fillings which used activated carbon as the carrier, loaded with Mn, Sn, and Sb as one-component metal oxide or composite metal oxide Then, through physical and chemical characterization and phenol oxidation experiments, Fully studied electro-catalytic oxidation of different particle electrodes, also discussed its electro-catalytic oxidation mechanism of phenol. The main conclusions are summarized as follows:In the preparation of the fillings, MnO2/AC was prepared by using impregnation method, Sn O2-Sb Ox/AC and Mn O2-Sn O2-Sb Ox/AC was prepared by using sol-gel method. In the physical characterization, SEM analysis showed that loads was loaded evenly, dispersed good, and no chunks loads reunion. XRD analysis showed that in Mn O2/AC, phase of manganese dioxide was Mixed with α and β type; in Sn O2-Sb Ox/AC, phase of tin dioxide was tetragonal; in Mn O2-Sn O2-Sb Ox/AC, phase of manganese dioxide was α type, phase of tin dioxide was tetragonal. BET analysis showed that after the load, surface area, pore diameter and pore volume were all have a large-scale decline, loads have a strong capacity to encroach channel, loads was fully loaded, Mn O2-Sn O2-Sb Ox/AC was most obvious.In the Electrochemical Characterization, CV of 0~1.8V showed that Mn O2-Sn O2-Sb Ox/AC appeared oxidative and reducing peak, Speculating which was caused by the redox processes of metal oxide. The active point have a significant increase after fillings was loaded than not loaded. CV of-0.1 ~ 0.6V showed that,after the fillings loading, the oxidation has an improvement by electrical double layer farms. Polarization curve analysis showed that, In terms of oxygen evolution potential, Mn O2-Sn O2-Sb Ox / AC better than Sn O2-Sb Ox/AC than not loaded than Mn O2/AC. In terms of exchange current density, the loaded type were generally better than not loaded, Mn O2-Sn O2-Sb Ox/AC was most significant. EIS Shows in the charge transfer resistance, Sn O2-Sb Ox/AC has minimal resistance, followed by Mn O2-Sn O2-Sb Ox/AC and Mn O2/AC, all of those less than no loaded. In terms of diffusion-controlled, MnO2-SnO2-SbOx/AC has the most advantage, followed by SnO2-Sb Ox/AC and Mn O2/AC.Phenol wastewater experiments were treated when Fillings was used as particle electrode in the packed-bed reactor. Water treatment showed that Mn O2-Sn O2-Sb Ox/AC better than Sn O2-Sb Ox/AC then Mn O2/AC in COD and phenol removal. From UV analysis, fillings which was loaded has an improvement in treat of middle organic like quinone and so on form degradation of phenol, Mn O2/AC was best, followed by Sn O2-Sb Ox/AC and Mn O2-Sn O2-Sb Ox/AC. Combined with water treatment index and electrochemical characterization analysis, suggesting that manganese dioxide generated Mn Ox+1, which promoted the fillings’ selective oxidation of phenol and closed-loop organics such as quinone, suggesting tin dioxide generated Sn O2(?OH), which promoted the fillings’ electrochemical combustion on organic such as benzene. Energy consumption and current efficiency analysis showed Mn O2-Sn O2-Sb Ox/AC better than Sn O2-Sb Ox/AC then Mn O2/AC.