不同复极性粒子电极的制备及电催化氧化效能

Preparation and electro-catalytic oxidation efficiency of different bipolar particle electrodes

分别以高阻抗的瓷环粒子、陶瓷粒子、陶土粒子及黏土粒子为载体,负载Sb掺杂Sn O2活性催化组分制备粒子电极,并通过SEM、EDS、XRD等表征手段对其形貌及结构进行研究,筛选出瓷环粒子、陶土粒子。并以农药氧化乐果为目标物,对所筛选的粒子电极进行电催化氧化效能的对比研究。结果表明,负载Sb掺杂Sn O2的瓷环粒子电极表面积相对较大,具有丰富的孔结构,且具有一定的导电性。在所构建的三维电极体系中处理COD为900mg/L左右的氧化乐果废水,当支持电解质无水Na2SO4浓度为0.1mol/L、激发槽电压为13V时,处理120min后,在瓷环粒子三维电极体系中废水COD去除率比陶土粒子三维电极体系高9.58%,比二维电极体系高25.7%;相应的能耗分别低2.9k W?h/kg(COD)和7.9k W?h/kg(COD)。

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 Sn O2 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 120 min under the conditions of supporting electrolyte concentration of 0.1mol/L,excitation cell voltage of 13 V,the treatment time of 120 min. 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 2.9k W？h/kg（COD） and 7.9k W？h/kg（COD）,respectively.