Since iron (Fe) was first proven to have a strong reduction ability, it has been successfully applied to remove pollutants from water. In this study, nickel hydroxide (Ni(OH)₂), a catalyst commonly used in hydrogen evolution reactions, was added to improve the activity of Fe to remove N-nitrosodimethylamine (NDMA). The results showed that with the increasing Ni(OH)₂ dosages, the reactions accelerated. The NDMA removal rates increased when the pH value was 6 or 7. Further, when the dissolved oxygen concentration was in the range of 0 – 12.0 mg∙L^-1, it had little effect on the Fe/Ni(OH)₂ system. All the reactions obeyed pseudo-first-order kinetics, and 1,1-dimethylhydrazine and dimethylamine were formed during NDMA degradation. The capture of active substances and electron spin resonance method confirmed that the main active species were active hydrogen atoms, which participated in the removal of NDMA. Ni(OH)₂ acting as a catalyst was confirmed using wide-angle X-ray diffraction, X-ray photoelectron spectroscopy and Ni²⁺ dissolution. Further, catalytic hydrogenation was proposed as the main removal mechanism as Ni(OH)₂ promotes the dissociation of water, thereby providing more active sites for the hydrogen evolution reaction. In addition, Ni(OH)₂ may activate both Fe and NDMA. This technique could be employed as an alternative for NDMA reduction and expand the application field of Ni(OH)₂.

由于铁（Fe）最初被证明具有很强的还原能力，因此已成功应用于去除水中的污染物。在这项研究中，添加了氢氧化镍（Ni（OH）₂），一种常用于氢释放反应的催化剂，以提高Fe去除N-亚硝基二甲胺（NDMA）的活性。结果表明，随着Ni（OH）₂剂量的增加，反应加速。当pH值为6或7时，NDMA去除率增加。此外，当溶解氧浓度在0 – 12.0 mg∙L ^-1范围内时，对Fe / Ni（OH）_2的影响很小。系统。所有反应均服从拟一级动力学，并且在NDMA降解期间形成了1，1-二甲基肼和二甲基胺。活性物质的捕获和电子自旋共振方法证实了主要的活性物质是活性氢原子，它们参与了NDMA的去除。使用广角X射线衍射，X射线光电子能谱和Ni ²⁺溶解来确认作为催化剂的Ni（OH）₂。此外，由于Ni（OH）₂促进了水的离解，因此提出了催化氢化作为主要的去除机理，从而为析氢反应提供了更多的活性位点。另外，Ni（OH）₂可能同时激活Fe和NDMA。该技术可以作为NDMA还原的替代方法，并扩展Ni（OH）₂的应用领域。