中文摘要：

采用化学还原与电沉积方法制备了钯和石墨烯复合膜碳纸（Pd/r GO/C）电极。以制备的Pd/r GO/C电极为阴极,通过电化学还原法处理水中硝酸盐。结果表明,与碳纸（C）、石墨烯修饰碳纸（r GO/C）、钯修饰碳纸（Pd/C）电极相比,Pd/r GO/C电极对于硝酸盐还原具有更高的电催化活性及N2选择性。Pd和r GO具有良好的协同催化还原硝酸盐作用。当外加电压由-0.75 V降至-1.0 V时,Pd/r GO/C电极还原速率k值由0.001 min-1快速提高至0.061 min-1。中性条件更利于Pd/r GO/C电极还原硝酸盐及N2生成。同时,Pd/r GO/C电极对浓度区间为6.8-22.6 mg（NO3^--N）/L硝酸盐催化还原效率较高,且反应液中未检测到金属Pd,无二次污染。

英文摘要：

In the current work,palladium and reduced-graphene oxide（ r GO） were loaded onto carbon paper using the electro-position method. The prepared Pd / r GO / C electrode was used as a catalytic cathode to remove nitrate from water through the electron-reduction process. Compared with the results from C,r GO / C,and Pd / C electrodes,the catalytic reduction activity of the Pd / r GO / C electrode was the best,and its selection rate of the N2 product was the highest. It was observed that the Pd and r GO have a synergistic effect on the electrochemical reduction of nitrate. Within the applied potential from- 0. 75 to- 1. 0 V,the reduction rate significantly increased from 0. 001 to 0. 061 min- 1. The neutral condition was beneficial for nitrate reduction and the target product,N2 generation. Within the nitrate concentration range from 6. 8 to 22. 6 mg（ NO3^--N） / L,the Pd / r GO / C electrode exhibited high and stable electrocatalytic activity,and no Pd was detected in the reaction solution.