Copper nanoparticles (Cu-NPs) have garnered substantial interest in the field of nanotechnology due to their exceptional physical and chemical properties and cost-effectiveness. However, challenges such as particle aggregation and rapid copper oxidation affect nanoscale production. This study systematically investigates the synthesis of colloidal Cu-NPs using chitosan (Cts) as a stabilizer and reducing agent in the arc discharge system, comparing it to distilled water as a medium. Confirmation of the purity, size, and morphology of the Cu-NPs is achieved through various physicochemical characterization methods. X-ray diffraction patterns confirm the synthesis of highly pure face-centered cubic (fcc) crystal Cu-NPs. UV–vis analysis reveals absorption peaks at 572–585 nm, indicating pure copper. Fourier-transform infrared spectroscopy shows peaks at 638 and 597 cm⁻¹, corresponding to Cu─Cts bonds. Transmission electron microscopy images depict spherical nanoparticles ranging from 15 to 45 nm, with smaller sizes at higher Cts concentrations. The catalytic activity of Cu-NPs in the degradation of 4-nitrophenol to 4-aminophenol is assessed, with Cu-NPs synthesized in distilled water demonstrating superior catalytic properties compared to 0.10 wt.% Cts. This study highlights the efficacy of the arc discharge method in producing pure, uniformly sized Cu-NPs with potential applications in catalysis.

中文翻译：

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壳聚糖介导的铜纳米粒子的电弧放电合成用于多相催化 4-硝基苯酚降解

铜纳米粒子（Cu-NPs）由于其优异的物理和化学性质以及成本效益而引起了纳米技术领域的广泛关注。然而，颗粒聚集和铜快速氧化等挑战影响了纳米级生产。本研究系统地研究了在电弧放电系统中使用壳聚糖（Cts）作为稳定剂和还原剂合成胶体铜纳米粒子，并将其与蒸馏水作为介质进行比较。通过各种物理化学表征方法可以确认 Cu-NP 的纯度、尺寸和形态。X 射线衍射图证实了高纯度面心立方 (fcc) 晶体 Cu-NP 的合成。紫外可见分光光度计显示吸收峰位于 572-585 nm，表明纯铜。傅里叶变换红外光谱显示638和597 cm ^-1处的峰，对应于Cu─Cts键。透射电子显微镜图像描绘了 15 至 45 nm 范围内的球形纳米粒子，在较高 Cts 浓度下尺寸较小。评估了 Cu-NP 在 4-硝基苯酚降解为 4-氨基苯酚中的催化活性，在蒸馏水中合成的 Cu-NP 表现出比 0.10 wt.% Cts 更优异的催化性能。这项研究强调了电弧放电方法在生产纯的、尺寸均匀的 Cu-NP 方面的功效，并在催化领域具有潜在的应用。