The study reports a versatile, cost-efficient and ecofriendly protocol for the synthesis of biogenic silver nanoparticles (AgNPs) using the aqueous extracts of Quao Binh Chau, Stereospermum binhchauensis and Che Vang, Jasminum subtriplinerve and their application in antibacterial activity and catalysis. The AgNPs with varying morphology and physical properties have been optimized using the absorption measurements. The biogenic AgNPs have been characterized by Fourier transform infrared spectroscopy, UV–Vis spectroscopy, transmission electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and thermal behaviors. Stable crystalline AgNPs with average particle sizes of 20.0 nm and 8.0 nm were fabricated from aqueous extract of Quao Binh Chau and Che Vang, respectively. The phytochemicals from the extracts involved in reduction and stabilization of AgNPs are identified by FTIR spectra and thermal gravimetric analysis. Both the biosynthesized AgNPs show the potent antibacterial activity against four tested bacterial strains including Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Agrobacterium tumefaciens. High catalytic activity of the biogenic AgNPs in the degradation of toxic contaminants (4-nitrophenol and methyl orange) was observed. The antibacterial and catalytic activities are found to be size and phytochemical dependent. The antibacterial and catalytic activities of the biogenic nanoparticles would find applications in the biomedical and environmental fields.

中文翻译：

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新型生物银纳米颗粒用于抗菌作用和污染物的催化降解

该研究报告了一种利用Quao Binh Chau，Stereospermum binhchauensis和Che Vang，Jasminum subtriplinerve的水提取物合成生物银纳米颗粒（AgNP）的通用，经济高效且环保的方案。及其在抗菌活性和催化作用中的应用。使用吸收测量对形态和物理特性各不相同的AgNP进行了优化。通过傅立叶变换红外光谱，UV-Vis光谱，透射电子显微镜，X射线衍射分析，能量色散X射线光谱和热行为表征了生物型AgNPs。由Quao Binh Chau和Che Vang的水提物分别制备了平均粒径为20.0 nm和8.0 nm的稳定结晶AgNP。通过FTIR光谱和热重分析鉴定了提取物中涉及AgNPs还原和稳定的植物化学物质。两种生物合成的AgNP均显示出对四种测试细菌菌株的有效抗菌活性，包括枯草芽孢杆菌，金黄色葡萄球菌，大肠杆菌和根癌农杆菌。观察到生物AgNPs在降解有毒污染物（4-硝基苯酚和甲基橙）方面具有高催化活性。发现抗菌和催化活性是大小和植物化学依赖性的。生物纳米颗粒的抗菌和催化活性将在生物医学和环境领域中找到应用。