氧化镧掺杂二氧化铅电极的制备及其在有机物降解中的应用  

Preparation of La_2O_3 doped β-PbO_2 electrode and its application in electrochemical degradation of organic

作　　者：张铁明[1] 王勋华[1] 赵峰鸣[1] 童少平[1] 马淳安[1] 

机构地区：[1]浙江工业大学化学工程与材料学院绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《化工学报》2008年第S1期64-69,共6页CIESC Journal

基　　金：国家自然科学基金项目(20406019)。~~

摘　　要：利用电沉积法制备了氧化镧掺杂的二氧化铅电极(La_2O_3-β-PbO_2)。XRD和SEM显示La_2O_3颗粒均匀地嵌在二氧化铅镀层中,电化学测试表明La_2O_3掺杂显著提高了二氧化铅电极的析氧过电位。利用La_2O_3-β-PbO_2电极降解了水中的对氯苯酚,与常规β-PbO_2电极相比,LaO_3-β-PbO_2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,La_2O_3-β-PbO_2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-PbO_2电极分别仅有30.58%和1.01%,显示了较好的应用前景。La_2O_3 dopedβ-PbO_2 electrode(La_2O_3-β-PbO_2)was prepared by electrodeposition and further characterized by X-ray diffraction(XRD)and scanning electron microscpy(SEM).It was observed that La_2O_3 particles could be incorporated in the deposit uniformly.The result of electrochemical test demonstrates that the way of La_2O_3 doping can significantly increase oxygen evolution overpotential of lead dioxide.Compared with conventionalβ-PbO_2,La_2O_3-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 La_2O_3-β-PbO_2 reached 61.76%and 3.68%after 480 min electrolysis, respectively,while 30.58%and 1.01%forβ-PbO_2 under the same conditions.Therefore,this electrode indicated good prospects of application.

关 键 词：二氧化铅 掺杂 降解 对氯苯酚 La₂O₃ 

分 类 号：X505[环境科学与工程—环境工程]