Plasmonic Nano Silver: An Efficient Colorimetric Sensor for the Selective Detection of Hg2+ Ions in Real Samples

Coatings

Nasir Mahmood Abbasi¹  Muhammad Usman Hameed²  Shabnam Shahida²  Syed Mubashar Sabir²  Faizah Altaf³  Najma Nasim³  Sana Fayyaz³  Patrizia Bocchetta⁴  Farid Ahmed⁵ 

[1] College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China;Department of Chemistry, University of Poonch, Rawalakot 12350, Pakistan;Department of Chemistry, Women University of Azad Jammu & Kashmir, Bagh 12500, Pakistan;Department of Innovation Engineering, University of Salento, Edificio La Stecca, Via per Monteroni, 73100 Lecce, Italy;Institute for Advanced Study Shenzhen University, Shenzhen 518060, China;

关键词: green synthesis;    nanotechnology;    silver nanoparticles;    surface plasmon resonance;    calorimetric detection;    tap water;   

DOI  :  10.3390/coatings12060763

来源: DOAJ

【 摘 要 】

Environmental pollution caused by heavy metal ions has become a major health problem across the world. In this study, a selective colorimetric sensor based on starch functionalized silver nanoparticles (St-Ag NPs) for rapid detection of Hg²⁺ in real samples was developed. The environmentally friendly green approach was utilized to synthesize starch functionalized silver nanoparticles (St-AgNPs). A multi-technique approach involving UV-Vis absorption spectroscopy, Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and scanning electron microscope (SEM) was used for the characterization of St-Ag NPs. These starch functionalized AgNPs were tested for the detection of heavy metals at 25 °C. The screening process revealed clear changes in the AgNPs color and absorption intensity only in the presence of Hg²⁺ due to the redox reaction between Ag⁰ and Hg²⁺. The color and absorption intensity of nanoparticles remain unchanged in the presence of all the other tested metals ion. The proposed method has strong selectivity and sensitivity to Hg²⁺ ions, with a detection limit of 1 ppm revealed by UV-visible spectrophotometry. The proposed procedure was found to be successful for the detection of Hg²⁺ in real samples of tap water.

【 授权许可】

Unknown