关键词: 电化学, 粒子电极, 有机化合物, 污染, COD去除率

Abstract: In this work,different high-impedance carriers of ceramic ring particle,ceramic particle,pottery particle and clay particle loaded with activated component of Sb doped SnO₂ were applied to prepare various particle electrodes. The micrograph and crystal structure of the particle electrodes were characterized by the scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS) and X-ray diffraction(XRD) to screen out the ceramic ring particle and the pottery particle. Furthermore,the comparison of the electro-catalytic oxidation efficiency among the selected particle electrodes was made with omethoate pesticide as target pollutant. The ceramic ring particle electrodes exhibited a larger specific surface area,more abundant pore structure and certain electrical conductivity. Omethoate waste water with COD concentration of 900mg/L was treated for 120min under the conditions of supporting electrolyte concentration of 0.1mol/L,excitation cell voltage of 13V,the treatment time of 120min. Compared to the three-dimensional electrode system with pottery particle and the two-dimensional electrode system,the system with ceramic ring particle electrodes increased the COD removal rate by 9.58% and 25.7%,respectively,and reduced the corresponding energy consumption by 2.9kW·h/kg(COD) and 7.9kW·h/kg(COD),respectively.

Key words: electrochemistry, particle electrode, organic compounds, pollution, COD removal rate