Metal and metal oxide nanoparticles are very suitable for catalytic activities in organic electron transfer processes. Among these, copper is one of the most important materials that have catalytic activity and the synthesis of copper/copper oxide nanoparticles (\(\mathrm{C}\mathrm{u}\)/\({\mathrm{C}\mathrm{u}}_{2}\mathrm{O}\) NPs) is more cost-effective than other noble metals. In this study, a combination of copper nanoparticles with different degree of oxidation has been synthesized by electrochemical method. The efficiency of synthesized material for the catalytic reduction of 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride was studied. The morphology, particle size, and crystalline structure of the synthesized catalyst was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) methods. The kinetics of reaction was followed by UV–Visible spectroscopy and the effect of different parameters such as initial concentrations of 4-nitrophenol, sodium borohydride and catalyst dosage on the reaction rate was studied. The recyclability of the prepared catalyst was investigated as well. The reaction order of the catalyst dosage was investigated by graphical analysis method. Finally based on Langmuir–Hinshelwood (L–H) mechanism the rate of reaction was modeled.

金属和金属氧化物纳米粒子非常适合有机电子转移过程中的催化活性。其中，铜是最重要的具有催化活性和合成铜/铜氧化物纳米粒子（\（\ mathrm {C} \ mathrm {u} \） / \（{\ mathrm {C} \ mathrm {u}} _ {2} \ mathrm {O} \）NPs）比其他贵金属更具成本效益。在这项研究中，已通过电化学方法合成了具有不同氧化程度的铜纳米粒子的组合。研究了合成材料在硼氢化钠存在下将4-硝基苯酚催化还原为4-氨基苯酚的效率。通过扫描电子显微镜（SEM）和X射线衍射（XRD）方法研究了合成催化剂的形貌，粒径和晶体结构。通过紫外可见光谱跟踪反应动力学，并研究了不同参数（例如4-硝基苯酚的初始浓度，硼氢化钠和催化剂用量）对反应速率的影响。还研究了制备的催化剂的可回收性。通过图形分析方法研究了催化剂用量的反应顺序。最后，基于Langmuir-Hinshelwood（L-H）机制，对反应速率进行了建模。