Sensing of mercury ion using light induced aqueous leaf extract mediated green synthesized silver nanoparticles of Cestrum nocturnum L

Environ Sci Pollut Res Int. 2022 Nov;29(53):79995-80004. doi: 10.1007/s11356-022-19357-x. Epub 2022 Feb 23.

Abstract

In this study, a simple, one-pot, and eco-friendly biosynthesis of silver nanoparticles (AgNPs) was accomplished with the use of aqueous leaves extract of Cestrum nocturnum L.(AECN). Different techniques like ultraviolet-visible (UV-Vis) spectrophotometry, Fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning area electron diffraction were used to investigate the optical, operational, and physical properties of the green synthesized AECN-AgNPs.The AECN-AgNPs were further used for the detection of Hg2+ by UV-Vis and electrochemical methods. The disintegration of the AECN-AgNPs solution caused the formation of an Ag-Hg amalgam, which caused discoloration of the solution. Sensing performance for a variety of metals such as Na+, K+, Mg2+, Ca2+, Ni2+, Cu 2+, Fe3+, Zn2+, Co2+, Cd2+, Pb2+, As3+, and Mn2+ at 10-mM concentrations was measured in order to determine the selectivity of the sensor towards the Hg2+. For the electrochemical determination of 2 + Hg2+ , AECN-AgNPs were immobilized on a glassy carbon (GC) electrode, and the resulting modified electrode (GC/AECN-AgNPs) was characterized by cyclic voltammetry. This phenomenon is advantageously used for the sensitive determination of trace level Hg2+. GC/AECN-AgNPs demonstrated a linear calibration range of 100 nM to 10 μM and a limit of detection of 21 nM for Hg2+ determination.

Keywords: Cestrum nocturnum; Cyclic voltammetry; Electrochemical; Glassy carbon; Hg2+sensor; Silver nanoparticles.

MeSH terms

  • Cadmium
  • Carbon
  • Cestrum*
  • Lead
  • Mercury*
  • Metal Nanoparticles* / chemistry
  • Methyl Green
  • Plant Extracts / pharmacology
  • Silver / chemistry
  • Spectroscopy, Fourier Transform Infrared
  • Water / chemistry
  • X-Ray Diffraction

Substances

  • Silver
  • Mercury
  • Methyl Green
  • Cadmium
  • Lead
  • Water
  • Plant Extracts
  • Carbon