不同条件下Cu-Pd-TiO_2多金属纳米电极去除地下水中硝酸盐氮的影响  

Effect of Cu-Pd-TiO_2 Polymetallic Nanoelectrode to Remove NO_3^--N in Groundwater Under Different Conditions

作　　者：刘芳[1,2] 李淼[2] 周方[2] 胡伟武[3] 王乐乐[3] 刘翔[2] 

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]清华大学环境学院,北京100084 [3]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《现代地质》2017年第3期623-628,共6页Geoscience

基　　金：国家自然科学基金项目(51408335)

摘　　要：以Pt为阳极,以Ti纳米管为基底修饰一薄层Pd和Cu构成的多金属纳米电极为阴极,搭建电化学反应器进行去除硝酸盐氮(NO_3^--N)研究,观察了在不同电流密度、初始浓度和pH值条件下该多金属纳米电极对NO_3^--N去除率的影响。结果表明,在电流密度为30 m A/cm^2,添加0.50 g/L的Na_2SO_4作为支持电解质的条件下,电解90 min后Cu-PdTiO_2多金属纳米电极对硝酸盐的去除率可达81%,而相同条件下金属Ti做阴极时对硝酸盐的去除率仅为24.5%。溶液pH值的改变对NO_3^--N的去除效果几乎没有影响;随着电流密度的增高,NO_3^--N的去除效率也随之提高;而随着溶液初始浓度的升高,NO_3^--N的去除率反而略有下降。Taking Pt as anode, and taking the polymetallic nanoelectrode （Cu-Pd-TiO2） formed by a thin Cu and Pd layer coating on the Ti nanotubes as cathode, the authors constructed an electrochemical reactor for NO3 - -N removal, and observed the removal rates of the polymetallic nanoelectrode to NO3 - -N under different conditions such as current density, initial concentrations, pH influence, and so on. The results showed that using the Cu-Pd-TiO2 polymetallic nanoelectrode, the nitrate removal rate can reach 81% in the presence of O. 50 g/L Na2SO4 with the current density of 30 mA/cm2 after 90 min electrolysis, and that under the same conditions, the removal rate of the Ti electrode as cathode was 24.5 %. The pH had little effect on the NO3 - - N removal rate. For the same initial nitrate concentration, the NO3 --N removal rate increased with increasing current density. The NO3 --N reduction efficiency declined slightly as the initial nitrate concentration increased.

关 键 词：多金属纳米电极 硝酸盐 纳米管 阴极 阳极 

分 类 号：P641.3[天文地球—地质矿产勘探]