Full Factorial Design Synthesis of Silver Nanoparticles Using Origanum vulgare

Reactions Pub Date : 2023-09-14 DOI:10.3390/reactions4030030
Nickolas Rigopoulos, Christina Megetho Gkaliouri, Viktoria Sakavitsi, Dimitrios Gournis
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Abstract

Green synthesis of silver nanoparticles (AgNPs) involves a reduction reaction of a metal salt solution mixed with a plant extract. The reaction yield can be controlled using several independent factors, such as extract and metal concentration, temperature, and incubation time. AgNPs from Origanum vulgare (oregano) were synthesized in the past. However, no investigations were performed on the combined effects of independent factors that affect the synthesis. In this work, silver nitrate, oregano extract, and sodium hydroxide (NaOH) concentrations were chosen as the independent factors, and full factorial design under Response Surface Methodology was employed. UV–Vis absorbance spectroscopy, X-ray Powder Diffraction (XRD), and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the nanoparticles. A Voigt function was fitted on the measured UV–Vis spectra. The fitting parameters of the Voigt function, peak wavelength, area, and Full Width at Half Maximum, were used as the responses. A quadratic model was fitted for the peak wavelength and area. The NaOH concentration proved to be the dominant factor in nanoparticle synthesis. UV–Vis absorbance showed a characteristic plasmon resonance of AgNPs at 409 nm. XRD verified the crystallinity of the nanoparticles and FTIR identified the ligands involved.
全因子设计合成银纳米颗粒的研究
绿色合成纳米银粒子(AgNPs)涉及金属盐溶液与植物提取物混合的还原反应。反应产率可以用几个独立的因素来控制,如萃取物和金属的浓度、温度和孵育时间。从牛至植物中合成AgNPs的方法比较多。然而,没有对影响合成的独立因素的综合效应进行调查。以硝酸银、牛至提取物和氢氧化钠(NaOH)浓度为独立因素,采用响应面法进行全因子设计。利用紫外可见吸收光谱、x射线粉末衍射(XRD)和傅里叶变换红外光谱(FTIR)对纳米颗粒进行了表征。对测得的紫外可见光谱拟合Voigt函数。使用Voigt函数的拟合参数,峰波长,面积和半最大值时的全宽度作为响应。对峰值波长和面积进行了二次拟合。氢氧化钠浓度是纳米颗粒合成的主要影响因素。紫外-可见吸光度显示AgNPs在409 nm处具有特征性的等离子体共振。XRD验证了纳米颗粒的结晶度,FTIR鉴定了所涉及的配体。
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CiteScore
2.70
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