Department of Biotechnology, Acharya Nagarjuna University, Nagarjunanagar, Guntur, Andhra Pradesh, 522510, India.
Department of Botany and Microbiology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, 522510, India.
Environ Sci Pollut Res Int. 2018 Nov;25(32):32540-32548. doi: 10.1007/s11356-018-3105-9. Epub 2018 Sep 20.
In the present study, silver and gold nanoparticles (AgNPs and AuNPs) were green synthesised using the aqueous plant extract of Stemona tuberosa Lour. When plant extract was mixed with AgNO and HAuCl solutions in separate reactions, the amalgamated solutions turned deep reddish brown and dark purple in colour after 48 h indicating the formation of AgNPs and AuNPs. UV-Visible analysis of green synthesised AgNPs and AuNPs have shown absorption maximum at 443.85 nm and 539.72 respectively after 48 h. Energy dispersive X-ray spectroscopy (EDX) analysis confirmed the presence of pure silver in the green synthesised AgNPs and pure gold in the plant-mediated AuNPs. X-ray diffractometer (XRD) data revealed the face-centred cubic nature of AgNPs. Fluorescence transmission infrared (FTIR) spectrum has shown the characteristic peaks of different phytochemicals in the plant extract which acted as stabilising or capping agents of AgNPs. Scanning electron microscopy (SEM) analysis of AgNPs and AuNPs revealed that the nanoparticles are monodispersed. Transmission electron microscopy (TEM) studies revealed that AgNPs were mostly spherical with an average size of 25 nm whereas selected area electron diffraction (SAED) analysis confirmed their crystalline nature. Both AgNPs and AuNPs of S. tuberosa Lour have shown potential catalytic activity in the presence of sodium borohydride (NaBH) in the degradation and removal of 4-nitrophenol, methylene blue, methyl orange and methyl red.
在本研究中，采用蔓生百部（Stemona tuberosa Lour.）的水提植物提取物，通过绿色合成法制备了银纳米粒子（AgNPs）和金纳米粒子（AuNPs）。当植物提取物分别与 AgNO 和 HAuCl 溶液混合时，在 48 小时后，混合溶液会变成深红棕色和深紫色，表明 AgNPs 和 AuNPs 的形成。对绿色合成的 AgNPs 和 AuNPs 的紫外可见分析显示，在 48 小时后，它们的吸收最大值分别为 443.85nm 和 539.72nm。能量色散 X 射线光谱（EDX）分析证实了绿色合成的 AgNPs 中存在纯银，而在植物介导的 AuNPs 中存在纯金。X 射线衍射仪（XRD）数据显示 AgNPs 具有面心立方结构。荧光传输红外（FTIR）光谱显示了植物提取物中不同植物化学物质的特征峰，这些峰充当了 AgNPs 的稳定或封端剂。AgNPs 和 AuNPs 的扫描电子显微镜（SEM）分析表明，纳米颗粒是单分散的。透射电子显微镜（TEM）研究表明，AgNPs 大多呈球形，平均粒径为 25nm，而选区电子衍射（SAED）分析证实了它们的结晶性质。蔓生百部（Stemona tuberosa Lour.）的 AgNPs 和 AuNPs 在硼氢化钠（NaBH）存在下，均显示出对 4-硝基苯酚、亚甲基蓝、甲基橙和甲基红的潜在催化活性，能够促进它们的降解和去除。
