Chemistry Department, Faculty of Sciences, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Biomolecules. 2020 Nov 26;10(12):1604. doi: 10.3390/biom10121604.
The bio-fabrication of silver nanoparticles (AgNPs) was carried out through the facile green route, using the aqueous extract of L. Herein, we have developed a cost-efficient, ecofriendly, and photo-induced method for the biomolecule-assisted synthesis of AgNPs using an aqueous extract of L. as a bio-reducing and capping/stabilizing agent. The biomolecule-capped AgNPs were confirmed from the surface plasmon resonance (SPR) band at λ = 450 nm using a UV-visible spectrometer. The stability of the AgNPs was confirmed by recording the UV-visible spectra for a more extended period, and no precipitation was observed in the sol. The morphology and structure of photo-induced biomolecule-capped AgNPs were characterized by different microscopic and spectroscopy techniques such as TEM, SEM, EDX, XRD, and FTIR analysis. The role of phytochemicals as reducing and stabilizing agents was confirmed by comparative FTIR analysis of the AgNPs and pure L. aqueous extract. The obtained result shows that the AgNPs are mostly spherical morphology with an average size of about 26 nm. Furthermore, the thermal stability of biomolecule-capped AgNPs was examined by TGA-DTG analysis that showed a weight loss of approximately 36.63% up to 800 °C. Moreover, the potential photocatalytic activity of photo-induced AgNPs against Rhodamine B (RB) was examined in the presence of UV light irradiation. The catalyst reusability, the effect of catalyst dosage and initial dye concentration, and the effect of the temperature and pH of the reaction medium were also assessed.
银纳米粒子（AgNPs）的生物制造是通过简单的绿色途径进行的，使用 L. 的水提物。在此，我们开发了一种成本效益高、环保且光诱导的方法，使用 L. 的水提物作为生物还原剂和封端/稳定剂，辅助生物分子合成 AgNPs。通过使用紫外可见分光光度计在 λ = 450nm 处的表面等离子体共振（SPR）带，确认了生物分子封端的 AgNPs。通过记录更长时间的紫外可见光谱来确认 AgNPs 的稳定性，并且在溶胶中没有观察到沉淀。通过不同的显微镜和光谱技术，如 TEM、SEM、EDX、XRD 和 FTIR 分析，对光诱导生物分子封端的 AgNPs 的形貌和结构进行了表征。通过比较 AgNPs 和纯 L. 水提物的 FTIR 分析，证实了植物化学物质作为还原剂和稳定剂的作用。得到的结果表明，AgNPs 主要呈球形形态，平均尺寸约为 26nm。此外，通过 TGA-DTG 分析研究了生物分子封端的 AgNPs 的热稳定性，结果表明在 800°C 下约有 36.63%的重量损失。此外，还在紫外光照射下研究了光诱导 AgNPs 对罗丹明 B（RB）的潜在光催化活性。评估了催化剂的可重复使用性、催化剂用量和初始染料浓度的影响、以及反应介质的温度和 pH 的影响。
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