钛基二氧化铅掺杂电极对附子加工废水的降解研究

Degradation of Aconitic Wastewater by Doped Lead Dioxide Electrodes on Ti Substrate

采用电沉积法分别制备未修饰、掺杂Bi、Cu和Bi+Cu四种钛基PbO2电极,利用扫描电镜(SEM)对制得的4种电极进行了表征。同时用所制得的电极对附子废水进行降解试验。研究表明Bi+Cu混合掺杂的电极能显著改善钛基PbO2电极的性能,对COD的去除率达到67.73%,对氯离子的去除率也能达到43.20%,而未掺杂电极对COD和氯离子去除率仅为42.34%和12.37%。电催化后废水的可生化性得到了显著提高,B/C值由电催化前的0.10提高到了0.39。利用X射线衍射分析(XRD)分别对掺Bi+Cu二氧化铅电极和普通二氧化铅电极进行表征,发现Bi+Cu修饰电极能有效改变电极表面二氧化铅晶体的性质。该种电极对处理中药高盐废水有极大的潜力。

Four kinds of lead dioxide electrodes on Ti substrate by electro-deposition were prepared,and the front four electrodes which were normal,doped with Bi,Cu,both Bi and Cu respectively were characterized by using scanning electron microscope.Meanwhile,the electrodes performances were compared by measurement of the removal efficiency of aconitic wastewater on both COD and chlorine ion.It was found that the electrode which doped with Cu＋Bi can evidently improve the lead dioxide electrode＇s performance.The removal efficiency of COD and chlorine ion were 67.73% and 43.20% while the normal one＇s removal efficiency achieved only 42.34% and 12.37%.After electrocatalysis,biodegradability of wastewater enhanced,with the value of B/C ranged from 0.1 to 0.39 sharply.Normal lead dioxide electrode and the electrode which doped with Bi and Cu by X-ray diffraction were characterized,and results indicated that the characters of lead dioxide crystalloid on the surface can improve the electro-catalytic performance of Bi and Cu-doped electrode.The studies proved this kind of electrode has the potential of application to Chinese materia medica wastewater treatment.