Issues

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2018

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vol. 16 / 

Issue 2

 



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K. O. Sodeinde, E. O. Dare, A. A. Lasisi, O. S. Ayanda, S. M. Nelana, E. B. Naidoo, O. S. Lawal1, and N. Revaprasadu
«Highly Sensitive Colorimetric Sensing of Mercury (II) Ions by Green Synthesized Gold Nanoparticles»
403–412 (2018)

PACS numbers: 68.37.Lp, 73.22.Lp, 78.30.C-, 78.40.Dw, 78.55.Bq, 78.67.Bf, 81.70.Fy, 92.40.qc

In this study, a rapid, simple and green method for sensing mercury (II) ions in aqueous solutions based on the shift in the localized surface plasmon resonance of biosynthesized gold nanoparticles (Au NPs) using Chrysophyllum albidum aqueous extract is developed. Au NPs biosynthesis is via microwave-assisted method. From the kinetic studies, the first-order rate constant value of 8.89?10?5 s?1 is obtained. Red shift in surface plasmon band of Au NPs from 520–540 nm to around 650 nm in a concentration-dependent manner is observed in the presence of Hg2? ions. The limit of detection and percentage recovery are 0.001 mg/L and 89–93%, respectively. Sensing capacity of the method is successfully applied to Iju river water samples. This novel method shows excellent sensitivity and selectivity for Hg2?, and it can be applied to the determination of Hg2? in water samples.

Keywords: gold nanoparticles, mercury, Chrysophyllum albidum, sensitivity, surface plasmon resonance

https://doi.org/10.15407/nnn.16.02.403

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