The Cu-Bi cathode was a new type of electrode in the field of electrocatalytic denitrification. The Cu-Bi electrode prepared by electrodeposition at the current density of 6 mA cm⁻² was better. The Cu-Bi coating was compact and crystalline by the characterization of SEM, EDS and XRD. Reduction of nitrate was investigated on Cu-Bi cathodes and Ti/Ru-IrO₂ anodes. For 100 mg L⁻¹ NO₃⁻-N, the highest NO₃⁻-N removal rate of 87.5% was obtained at the current density of 6 mA cm⁻² and in neutral electrolyte at 4 h. The removal of nitrate on Cu-Bi electrodes was better in neutral electrolyte, which didn't require additional acid or alkali to adjust pH. When the initial concentration of NO₃⁻-N was 50 mg L⁻¹, the effluent concentration of NO₃⁻-N at 4 h was 7.175 mg L⁻¹ lower than the level of drinking water on the standard of the World Health Organization (WHO, 10 mg L⁻¹). The kinetic investigation showed that the reduction of nitrate on Cu-Bi displayed pseudo first-order kinetic behavior. The results of Cyclic Voltammetric (CV) measurements indicated that nitrate was reduced on the Cu-Bi electrode with the occurrence of the hydrogen evolution.

Cu-Bi阴极是电催化反硝化领域中的一种新型电极。通过电沉积以6mA cm ^-2的电流密度制备的Cu-Bi电极更好。通过SEM，EDS和XRD的表征，Cu-Bi涂层致密且结晶。在Cu-Bi阴极和Ti / Ru-IrO ₂阳极上研究了硝酸盐的还原。对于100 mg L ^-1 NO ₃ ^-- N，在6 mA cm ^-2的电流密度下，最高NO ₃ ^-- N去除率达到87.5％。并在4小时内置于中性电解液中。在中性电解液中，Cu-Bi电极上的硝酸盐去除效果更好，不需要额外的酸或碱来调节pH。当NO ₃ ^-- N的初始浓度为50 mg L ^-1时，在4 h时NO ₃ ^-- N的废水浓度比世界卫生组织标准的饮用水水平低7.175 mg L ^-1。（WHO，10mg L ^-1）。动力学研究表明，硝酸盐在Cu-Bi上的还原表现出拟一级动力学行为。循环伏安法（CV）的测量结果表明，随着析氢的发生，硝酸铜在Cu-Bi电极上被还原。