Mn2+协同PDS对酸性蓝80的电催化降解性能研究

The study on electrocatalytic degradation performance of collaborative system of Mn 2+and PDS on Acid Blue 80

以酸性蓝80(AB80)模拟染料废水,采用E-Mn2+-PDS协同体系,对AB80进行电催化降解实验.对比了不同催化体系的降解效率,探讨了Mn2+与PDS浓度、pH值和电流密度等单因素对E-Mn2+-PDS体系电催化降解效率的影响,对E-Mn2+-PDS体系中的氧化性物质、AB80的分解产物及其在体系中的矿化程度进行了研究,并分析了降解机理.结果表明:与其他催化体系比较,E-Mn2+-PDS协同体系最优,对AB80的降解率高达99.9%.pH值是最主要的影响因素,p H=3时,E-Mn2+-PDS协同体系的降解率为99.6%;协同体系中的氧化性物质包括硫酸根自由基(SO4-·),羟基自由基(HO·),还有活性Mn3+;AB80在协同体系中经过多种化学反应形成11种主要分解产物.协同体系对AB80的矿化率是直接电催化的2.6倍;降解机理为:PDS被Mn2+与电流激发出SO4-·后,SO4-·与水反应生成HO·,然后HO·与电流将Mn2+氧化为活性Mn3+,三种氧化性物质协同降解污染物.

The present study was envisaged to study the electrocatalytic degradation of Acid Blue 80(AB80)using an electrocatalytic collaborative system(E-Mn2+-PDS).The degradation efficiencies of different catalytic systems were compared,and the effect of factors such as Mn2+concentration,PDS concentration,pH value and current density on the degradation efficiency of E-Mn2+-PDS collaborative system was explored.In addition,the oxidizing substances,decomposition products of AB80 and its degree of mineralization in the system were investigated,and the mechanism of degradation was elucidated.It was found that the degradation rate of E-Mn2+-PDS collaborative system on AB80 reached 99.9%in 45 min.pH was found to significantly affect the E-Mn2+-PDS collaborative system.When pH=3,the degradation rate of E-Mn2+-PDS reached 99.6%.The oxidizing substances in the E-Mn2+-PDS system included SO4-⋅,HO⋅,and active Mn3+.In the E-Mn2+-PDS collaborative system,AB80 underwent a series of reactions,which produced 11major decomposition products.Additionally,the mineralization rate of E-Mn2+-PDS system was 2.6 times that of the direct electrocatalysis in 6 hours.The degradation mechanism was found to be the production of SO4-⋅by Mn2+and the current from PDS,which subsequently reacted with water to generate HO⋅,this HO⋅oxidized the Mn2+to oxidizedactive Mn3+in the current,and the three different oxidizing species degraded the pollutants together.