In this green synthesis approach for copper oxide (CuO) nanoparticles (NPs), the reducing agent obtained from Camellia sinensis (Tea) extract was used. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet visible (UV-Vis) spectroscopy, field emission scanning electron microscope (FESEM) with energy-dispersive X-ray (EDX), high resolution transmission electron microscope (HRTEM) and Selected Area Electron Diffraction (SAED) techniques were used for as-prepared sample characterization. From XRD result, the crystallite size estimated by Scherrer method was found to be 35 nm. Morphological results reveals that the CuO NPs possesses small particle size with the range of 40–45 nm, led to high surface area, which enhances the absorption of more number of dye molecules, which results in high degradation efficiency. Present work reveals that degradation of malachite green (MG) dye in aqueous solutions under sonocatalytic treatment. CuO NPs exhibit excellent degradation efficiency against MG dye (95 % removal in 70 min). Moreover, the rate constant for the degradation efficiency was investigated with pseudo- first and second order kinetics. Moreover, CuO NPs possesses potential antibacterial activity against human pathogens such as Gram-positive (Staphylococcus pyogenes) and Gram-negative (Pseudomonas aeruginosa).

中文翻译：

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茶提取物辅助CuO纳米颗粒的绿色合成结构、形态和声催化特性


在这种氧化铜（CuO）纳米颗粒（NP）的绿色合成方法中，使用了从茶树（茶）提取物中获得的还原剂。 X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR)、紫外可见 (UV-Vis) 光谱、带能量色散 X 射线 (EDX) 的场发射扫描电子显微镜 (FESEM)、高分辨率透射电子显微镜 ( HRTEM）和选区电子衍射（SAED）技术用于对所制备的样品进行表征。从XRD结果来看，通过Scherrer方法估计的微晶尺寸为35nm。形貌结果表明，CuO NPs 粒径小，范围为 40-45 nm，表面积大，增强了更多染料分子的吸收，从而产生高降解效率。目前的工作揭示了声催化处理下孔雀石绿（MG）染料在水溶液中的降解。 CuO NPs 对 MG 染料表现出优异的降解效率（70 分钟内去除 95%）。此外，利用伪一级和二级动力学研究了降解效率的速率常数。此外，CuO NPs 对革兰氏阳性菌（化脓性葡萄球菌）和革兰氏阴性菌（铜绿假单胞菌）等人类病原体具有潜在的抗菌活性。