ABSTRACT Nowadays, there is an imperative need of synthesising nanomaterials from industrial wastes in an eco-friendly manner. In this concern, Cu and CuO nanoparticles (NPs) were successfully synthesised from copper scrap using plasma arc discharge method under N2 and air atmosphere. The synthesised NPs were confirmed using X-ray diffraction, UV-visible spectrophotometer and energy-dispersive spectroscopy. High-resolution transmission electron microscopy was carried out to study the morphology and average particle size of synthesised NPs. The results revealed that the particles exhibit spherical and distorted sphere morphology with average particle size of 78 nm and 67 nm for Cu and CuO NPs, respectively. The antibacterial activity has been examined against different gram-positive and gram-negative bacteria. The highest zone of inhibition was measured as 32 mm and 28 mm for Staphylococcus aureus and Klebsiella pneumoniae bacteria which indicates the potent of synthesised NPs in various biomedical applications that can be explored in future. Graphical abstract

中文翻译：

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使用等离子弧放电法从废铜中简便合成 Cu 和 CuO 纳米颗粒并评价抗菌活性

摘要 如今，迫切需要以环保的方式从工业废物中合成纳米材料。在这个问题上，在 N2 和空气气氛下，使用等离子弧放电方法从废铜中成功合成了 Cu 和 CuO 纳米颗粒（NPs）。合成的纳米颗粒通过 X 射线衍射、紫外可见分光光度计和能量色散光谱仪进行了确认。进行高分辨率透射电子显微镜以研究合成纳米颗粒的形态和平均粒径。结果表明，这些颗粒表现出球形和扭曲球形形态，Cu 和 CuO NPs 的平均粒径分别为 78 nm 和 67 nm。已经针对不同的革兰氏阳性和革兰氏阴性细菌检查了抗菌活性。金黄色葡萄球菌和肺炎克雷伯菌的最高抑菌圈分别为 32 毫米和 28 毫米，这表明合成 NPs 在未来可以探索的各种生物医学应用中的潜力。图形概要