Abstract:

La₂O₃ doped β-PbO₂ electrode（La₂O₃ -β-PbO₂）was prepared by electrodeposition and further characterized by X-ray diffraction（XRD）and scanning electron microscpy（SEM）It was observed that La₂O₃particles could be incorporated in the deposit uniformlyThe result of electrochemical test demonstrates that the way of La₂O₃ doping can significantly increase oxygen evolution overpotential of lead dioxideCompared with conventional β-PbO₂，La₂O₃-β-PbO₂ not only has fast COD removal rate，but also has high instantaneous current efficiency（ICE）in the process of degrading 4-chlorophenolFor example，the COD removal rate and ICE for La₂O₃-β-PbO₂ reached 61.76% and 3.68% after 480 min electrolysis，respectively，while 30.58% and 1.01% for β-PbO₂ under the same conditionsTherefore，this electrode indicated good prospects of application.

Key words:

二氧化铅, 掺杂, 降解, 对氯苯酚, La2O3

摘要：

利用电沉积法制备了氧化镧掺杂的二氧化铅电极（La₂O₃-β-PbO₂）。XRD和SEM显示La₂O₃颗粒均匀地嵌在二氧化铅镀层中，电化学测试表明La₂O₃掺杂显著提高了二氧化铅电极的析氧过电位。利用La₂O₃-β-PbO₂电极降解了水中的对氯苯酚，与常规β-PbO₂电极相比，La₂O₃-β-PbO₂电极不但有较高的COD去除率，而且具有较高的电流效率。相同条件下电解480 min后，La₂O₃-β-PbO₂电极对体系COD的去除率和电流效率分别为61.76%和3.68%;而β-PbO₂电极分别仅有30.58%和1.01%，显示了较好的应用前景。

关键词:

二氧化铅, 掺杂, 降解, 对氯苯酚, La2O3