Sensitive detection of lead ions using sodium thiosulfate and surfactant-capped gold nanoparticles

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• 作者：Nguyen Le Thao Nguyen ; Eun Joo Kim ; Suk-Kyu Chang ; Tae Jung Park
• 关键词：Gold nanoparticle ; CTAB ; stabilized AuNPs ; Lead detection ; Surface plasmon resonance
• 刊名：BioChip Journal
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：10
• 期：1
• 页码：65-73
• 全文大小：1,104 KB
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• 作者单位：Nguyen Le Thao Nguyen (1)
  Eun Joo Kim (1)
  Suk-Kyu Chang (1)
  Tae Jung Park (1)
  
  1. Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  
• 出版者：The Korean BioChip Society, in co-publication with Springer Verlag GmbH
• ISSN：2092-7843

文摘

Environmental pollution has become a serious problem at a global level because of its widespread and long-term harm. Contamination by heavy metal ions and toxic heavy metals, including zinc, copper, nickel, mercury, cadmium, and lead, causes significant long-term damage to many biological systems because these metals disrupt biological activities at the cellular level. Lead is one of the most abundant metals on earth. However, lead poisoning has been related to several diseases associated with environmental pollution. Therefore, it is essential to detect and remove lead ions from aqueous solutions. Water-soluble and stable cethyltrimetylammonium bromide (CTAB)-capped gold nanoparticles (AuNPs) were applied for the sensitive detection of Pb2+. These CTAB-capped AuNPs were employed to selectively detoxify heavy-metal ions such as Pb2+ ions. Detailed studies using UV/visible spectroscopy, electron microscopy, and dynamic light scattering showed that competitive binding of Pb2+ with the CTAB-capped AuNPs changed the surface properties in the presence of sodium thiosulfate (S₂O ₃ 2- ). This system is able to detect Pb2+ with a detection limit as low as 20 nM. This method has a great potential for the simple and rapid detection of lead ions with ultrasensitive and excellent selectivity.