不同条件下Cu Pd TiO2多金属纳米电极去除地下水中硝酸盐氮的影响

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(NO3- 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NO3- N去除率的影响。结果表明，在电流密度为30 mA/cm2，添加050 g/L的 Na2SO4作为支持电解质的条件下，电解90 min后Cu Pd TiO2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 NO3- N的去除效果几乎没有影响；随着电流密度的增高，NO3- N的去除效率也随之提高；而随着溶液初始浓度的升高，NO3- N的去除率反而略有下降。

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

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 0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.