On the supported granular activated carbon electrode for the three-dimensional electrode reactor
This article intends to introduce a three-dimensional electrode system for the electrochemical oxidation developed by its authors.For this purpose, the article has prepared various catalysts with different active metals, such as Fe, Mn, Zn, Ni, Sn, Sb and Ce, which are supported over the granular activated carbon (GAC) by the incipient wetness impregnation to be used as the three-dimensional particle-electrodes.While investigating the electrocatalytic activity and stability of the particle-electrodes for the degradation of EDTA, we have also analyzed the morphology, the element composition and the crystal phase compositions of the particle-electrodes via scanning electron microscope (SEM), the energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) so as to be able to identify the particular characteristic features of the particle-electrodes.The results of our investigation and analysis demonstrate that both the single oxide of Fe and the complex oxides of Sn, Sb and Ce can greatly improve the electrochemical oxidation efficiency, whereas the Sn-Sb-Ce/ GAC particle electrode enjoy the highest electrocatalytic activity and stability for degrading EDTA.When eliminating the interference of EDTA adsorption to the particle electrode, the removal rate of the total organic carbon (TOC) and EDTA through 120 min treatment can be made as high as 71.1％ and 88.7％ under the current of 200 mA and pH =4.8.In addition, Sn-Sb-Ce/GAC has been found very active even after it was reused ten times.What is more, the SEM image of Sn-Sb-Ce/GAC particle-electrode shows that the electrode surface can be rough but quite uniform.Such kinds of the surface morphology tend to be able to enact the electrochemical reactions over the higher superficial areas.Moreover, the energy dispersive spectrometer analysis indicates that the composition of Sn-Sb-Ce/GAC particle electrode turns to be much similar to that of the precursor liquid, though the XRD pattern of the electrode reveals that there may exist diffraction peaks of SnO2.Thus, it can be seen that it is of great significance to treat the organic sewage via the said three-dimensional electrolysis.
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