Characterization of Silver Nano-particle Coated Eichhornia crassipes Fiber for Antibacterial Applications

ABSTRACT

In this investigation, silver nano-particles (AgNPs) were coated on the surface of the Eichhornia crassipes fiber (ECF) by single-step hydrothermal method. The coating of AgNPs on the external layer of the ECFs was confirmed through the TGA, SEM, EDX and XRD analysis. The results of thermo gravimetric analysis revealed that thermal stability and maximum degradation temperature of the 6 mM AgNO₃ treated ECF was higher than the raw, NaOH treated and other AgNO₃ (2 mM, 4 mM, 8mM and 10 mM) treated ECF. Scanning electron scope and energy dispersive X-ray spectroscopy analysis proved the presence of AgNPs on the surface of the fiber with the average particle size of 93 nm. FTIR analysis demonstrated the involvement of OH groups of ECF in AgNPs generation process. XRD analysis displayed the corresponding peaks of silver nanoparticles (AgNPs) and silver oxide nano-particles (Ag₂ONPs) in the 6 mM AgNO₃ treated ECF. Antibacterial test outcomes proved the antibacterial nature of AgNPs coated ECF. All the above findings concluded that AgNPs coated ECF were suitable reinforcement in bio-films used for the medical and food packaging.

摘要

采用一步水热法在凤眼莲纤维（ECF）表面包覆银纳米粒子（AgNPs）. 通过TGA、SEM、EDX和XRD分析，确定了在ECFs外层有AgNPs涂层. 热重分析结果表明，经AgNO3处理的6 mm ECF的热稳定性和最大降解温度均高于未处理、NaoH处理和其他AgNO3（2mM、4mM、8mM和10mM）处理的ECF. 扫描电子显微镜和能谱分析表明，纤维表面存在AgNPs，平均粒径为93nm. FTIR分析表明ECF的OH基团参与了AgNPs的生成过程。XRD分析显示，在6mM的AgNO3处理的ECF中，银纳米粒子（AgNPs）和氧化银纳米粒子 (Ag2ONPs) 出现了相应的峰。抗菌试验结果证明了AgNPs涂层ECF的抗菌性. 以上结果表明，AgNPs包覆的ECF是一种适用于医药食品包装的生物膜增强体.

KEYWORDS:

• Eichhornia crassipes fiber
• NaOH Treatment
• AgNO₃
• silver nanoparticles (AgNPs)
• thermo gravimetric analysis (TGA)
• antibacterial test

关键词:

• 凤眼莲纤维
• 氢氧化钠处理
• 银纳米粒子 (AgNPs)
• 热重分析 (TGA)
• 抗菌试验