AEO改性二氧化铅电极在降解甲基橙过程中的电化学行为

Electrochemical Behavior of PbO_2 Electrode Modified by AEO for the Degradation of Methyl Orange

采用阳极氧化法在不锈钢基体上制备了脂肪醇聚氧乙烯醚(AEO)改性PbO2电极。通过SEM图像和XRD图谱分别考察了电极的表面形貌和物相组成,采用稳态极化法和循环伏安法分析了电极在甲基橙模拟废液中的电化学特性,并对质量浓度为10mg·L-1的甲基橙模拟废水进行了电催化降解实验。结果表明,与未改性PbO2电极相比,改性PbO2电极表面平整致密,具有较高的析氧电位和较高的氧化峰电流,有利于有机物的降解。降解实验结果表明改性电极的电催化活性高于未改性电极和石墨电极。

A set of PbO2 electrode modified by fatty alcohol ethoxylate （AEO） were prepared on stain-less steel substrate by means of anodic oxidation. The surface morphology and phase compositions ofthe modified electrodes were measured by SEM and XRD respectively. Electrochemical properties ofmodified electrode were analyzed by steady state polarization method and cyclic voltammetry in simula-ted methyl orange wastewater, and the electrocatalytic degradation experiment was carried under sim-ulated wastewater conditions with 10 mg · L-1 methyl orange. It is found that the modified electrodehas smoother and denser surface compared with pure PbO2 electrode. And the modified electrodeshows higher oxygen evolution potential and higher oxidation peak, which is conducive to the degrada-tion of organic pollutants. The results of degradation experiments indicate that the modified electrodegets better electrocatalytic activity than the pure PbO2electrodes and graphite electrodes.