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Synthesis and Characterization of Silver Nanoparticles Anchored on Montmorillonite via Chemical Reduction

机译：化学还原固定在蒙脱土上的银纳米粒子的合成与表征

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Montmorillonite clay particles were decorated with silver (Ag) nanoparticles by chemical reduction of Ag nitrate with sodium citrate. X-ray diffraction (XRD) and energy dispersive X-ray spectrometry (EDS) confirmed the presence of metallic Ag on the surface of montmorillonite. The average crystallite size of the Ag nanoparticles obtained from the broadening of the 111 Ag peak ranged at 13-16 nm. On the other hand, the apparent particle sizes obtained from the SEM images were about 79-128 nm, suggesting that the nanoparticles are polycrystalline and possibly agglomerated. The increase in the concentration of reducing agent produced smaller Ag nanoparticles with narrower size distribution. The antibacterial test showed that the Ag nanoparticles, with mean size of 79 nm, adsorbed on montmorillonite were able to inhibit the growth of Staphylococcus aureus (S. aureus) with an antimicrobial index of 0.4.
机译：通过用柠檬酸钠化学还原硝酸银，用银（Ag）纳米颗粒装饰蒙脱土粘土颗粒。 X射线衍射（XRD）和能量色散X射线光谱（EDS）证实了蒙脱石表面存在金属Ag。由111 Ag峰的增宽获得的Ag纳米颗粒的平均微晶尺寸在13-16nm范围内。另一方面，从SEM图像获得的表观粒度为约79-128nm，这表明纳米颗粒是多晶的并且可能团聚。还原剂浓度的增加产生具有更窄尺寸分布的较小的Ag纳米颗粒。抗菌测试表明，平均粒径为79 nm的Ag纳米颗粒吸附在蒙脱土上，能够以0.4的抗菌指数抑制金黄色葡萄球菌（S. aureus）的生长。

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