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采用涂刷-热分解法制备不同浓度阴离子表面活性剂十二烷基硫酸钠(SDS)的IrO_2-Ta_2O_5/SnO_2-Sb-MnO_2/Ti电极。通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对其微观形貌及物相组成进行分析;应用循环伏安、极化等测试手段,表征制备电极的电催化活性。结果表明,适量添加十二烷基硫酸钠能够改善IrO_2-Ta_2O_5/SnO_2-Sb-MnO_2/Ti电极的微观形貌,提高电催化活性。在本实验条件下,SDS最佳添加量是1.6 g/L,结晶化度高达99.83%。利用苯酚电催化降解实验和强化寿命测试进一步考察所制电极的电催化活性与稳定性,结果显示,在电流密度15 mA/cm~2条件下电解180 min,SDS的加入使苯酚去除率由原来的68.5%提高到79.2%,COD去除率由60.1%提高到67.5%,电催化性能得到提升,电极强化寿命由52 h延长至68 h。
IrO_2-Ta_2O_5 / SnO_2-Sb-MnO_2 / Ti electrodes with different concentrations of anionic surfactant sodium dodecyl sulfate (SDS) were prepared by brushing-pyrolysis method. The morphology and phase composition were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrocatalytic activity of the prepared electrode was characterized by cyclic voltammetry and polarization measurements. The results showed that proper addition of sodium dodecyl sulfate could improve the morphology of IrO_2-Ta_2O_5 / SnO_2-Sb-MnO_2 / Ti electrode and improve the electrocatalytic activity. Under the experimental conditions, the optimum amount of SDS is 1.6 g / L, the crystallization degree is as high as 99.83%. The electrocatalytic activity and stability of the prepared electrode were further investigated by using the electrocatalytic degradation test and the enhanced life test of phenol. The results showed that the electrocatalytic activity of the prepared electrode was 180 min at a current density of 15 mA / cm 2, From 68.5% to 79.2%. The COD removal efficiency increased from 60.1% to 67.5%, the electrocatalytic performance was improved, and the electrode life was extended from 52 h to 68 h.