关键词: PbO₂阳极, 电催化降解, 苯酚, 邻苯二酚

Abstract:

The preparation of stainless steel/PbO₂ electrode and doped stainless steel/Fe-PbO₂ electrode was mainly studied.The performance of the electrode was evaluated by the treatment effect of organic wastewater and the influencing factors.The experimental results showed that β-PbO₂ was the main component of the PbO₂ electrode prepared by the constant current anode electrodeposition technology.The appearance of the two electrodes had no obvious cracks and other defects.The iron doped lead dioxide coating particle was with inlaid size,which removed the internal stress well,to ensure that the substrate and coating was not easy to fall off.The undoped iron lead dioxide coating particles was fine,uniform with some large internal stress.Adding Fe（NO₃）₂ into the electrodeposition solution made the oxygen evolution potential of PbO₂ electrodeposition layer move to the positive direction,and improved the electrocatalytic activity of PbO₂ electrode,so that it was more conducive to the oxidation and degradation of organic matter.The modified Fe-PbO₂ electrode and conventional PbO₂ electrode were used to degrade catechol and phenol organic wastewater with the same initial concentration,respectively.The removal efficiency of phenol and catechol by the modified Fe-PbO₂ electrode was higher than that by the conventional PbO₂ electrode.Compared with the undoped electrode,the iron-doped PbO₂ electrode had better electrocatalytic activity and higher oxygen evolution po-tential,so it was more suitable to be used as electrocatalytic anode.

Key words: lead dioxide anode, electrocatalytic oxidative degradation, phenol, o-diphenol