The green and efficient removal of nitrate (NO₃⁻) in groundwater is a major challenge for safe water supply. In this study, palladium (Pd) and copper (Cu) nanoparticles were loaded on nickel-aluminium (NiAl)-layered metal oxide (LMO) to improve the catalytic activity of electro-sorption/reduction of NO₃⁻ by electrodes. The Pd-Cu bimetallic nanoparticles can effectively improve the transmission of electrons in electrodes. In addition, denitrification with the NiAl-LMO electrode loaded with Pd-Cu was superior to that with LMO loaded with Pd. Furthermore, electro-sorption/reduction was a more effective denitrification mode, which improved the efficiency and produced fewer by-products. The electro-sorption process not only enhanced denitrification, but also improved the selectivity of reduced to nitrogen. Thus, our study provides a green capacitive deionization (CDI) electrode material and efficient electric adsorption mode to enhance the denitrification.

绿色，高效去除硝酸盐（NO的₃ ^- ）的地下水是安全供水的一大挑战。在这项研究中，钯（Pd）和铜（Cu）纳米颗粒负载于镍-铝（NiAl金属）-layered金属氧化物（LMO），以改善电吸附/还原NO的催化活性₃ ^-通过电极。Pd-Cu双金属纳米粒子可以有效改善电极中电子的传输。此外，负载Pd-Cu的NiAl-LMO电极的反硝化效果优于负载Pd的LMO。此外，电吸附/还原是一种更有效的反硝化方式，提高了效率，产生的副产物更少。电吸附过程不仅增强了反硝化作用，而且还提高了还原为氮的选择性。因此，我们的研究提供了一种绿色电容性去离子（CDI）电极材料和有效的电吸附模式来增强反硝化作用。