论文部分内容阅读
考察了电流密度、pH值、曝气量、电解质Na_2SO_4浓度等工艺条件对活性炭纤维(ACF)阴极产生H_2O_2的影响规律。通过测定N_2吸附-脱附等温线和扫描电子显微镜(SEM)等手段观察了ACF的微观结构,从微观结构角度探讨了ACF阴极产生的优势与机理。结果表明,ACF孔隙结构丰富,比表面积大,有利于氧气分子在电极表面及孔道内的吸附-还原过程。当电流密度为5 m A/cm~2,pH=3,曝气量400 m L/min,电解质Na_2SO_4浓度为0.05 mol/L时,电解180 min还原产生H_2O_2的质量浓度高达27.86 mg/L。
The influences of current density, pH value, aeration rate and concentration of electrolyte Na2SO4 on the cathode of HfO2 produced by activated carbon fiber (ACF) were investigated. The microstructure of ACF was observed by means of N 2 adsorption-desorption isotherm and scanning electron microscope (SEM), and the advantages and mechanism of ACF cathode were discussed from microstructure perspective. The results show that the pore structure of ACF is rich and the specific surface area is large, which is favorable for the adsorption and reduction of oxygen molecules on the electrode surface and in the pores. When the current density is 5 m A / cm ~ 2, pH = 3, the aeration rate is 400 m L / min and the concentration of electrolyte Na_2SO_4 is 0.05 mol / L, the mass concentration of H_2O_2 produced by electrolysis for 180 min is as high as 27.86 mg / L.