二氧化铅粉末多孔电极处理氨氮废水的研究  

Research on the Treatment of Ammonia-nitrogen Wastewater by Lead Dioxide Power Porous Electrode

作　　者：朱艳[1] 汪家权[1] 陈少华[1] 徐建华[2] 胡洁[1] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]南京大学环境学院,污染控制与资源化国家重点实验室,江苏南京210046

出　　处：《环境工程技术学报》2012年第6期485-490,共6页Journal of Environmental Engineering Technology

基　　金：国家水体污染控制与治理科技重大专项(2008ZX07010-003-05)

摘　　要：采用高压塑片法制备纯PbO2电极及掺杂石墨+活性炭混合粉体的PbO2粉末多孔电极,通过扫描电镜、循环伏安手段对电极性能进行了表征,并以氨氮模拟废水为处理对象进一步考察电极的电催化性能。结果表明,PbO2粉末多孔电极具有较高的导电性及电催化活性,最佳掺杂量为15%～20%。氨氮的去除率随电流密度和氯离子浓度的增大而增加。初始pH为3.0～10.0时,氨氮的去除率随初始pH的升高而降低;初始pH为11.0～12.0时,氨氮的去除率随初始pH的升高而升高。氨氮降解的主要机理是阳极产生的强氧化物(·OH、HClO和ClO-)的间接氧化,其产物是以N2为主的含氮气体及少量的硝酸盐氮。Pure PbO2 electrode and PbO2 powder porous electrode which was modified by adding graphite and activated carbon powder, were prepared by high pressure molding. The electrode properties were evaluated by means of SEM and cyclic voltammetry. Furthermore, the electrocatalytic property was further examined through the treatment of ammonia-nitrogen wastewater. It was showed that PbO2 powder porous electrode was better in view of electrical conductivity and electrocatalytic activity and the optimum mass percentage of graphite and activated carbon powder was 15% to 20%. Removal etilciency of ammonia nitrogen was improved continuously with increasing current density and increasing concentration of chloride ion added. Besides, ammonia-nitrogen removal efficiency reduced continuously with increasing pH when the initial pH was between 3.0-10. 0, but increased when that was between 11.0-12.0. The treatment of ammonia-nitrogen wastewater by PbO2 powder porous electrode was due to strong oxidizing substances, such as .OH, HCIO and ClO-, which were produced by the electrocatalytic activity of anode, and the ammonia-nitrogen was finally oxidized into NO, gas mainly with N2 and with small amount of nitrate nitrogen.

关 键 词：PbO2粉末多孔电极 电催化 氨氮 ·OH HClO 

分 类 号：X703.1[环境科学与工程—环境工程]