|
Abstract
|
In the present study, a cost-effective, green and simple
synthesis method was applied for preparation of stable
silver chloride nanoparticles (AgCl-NPs). The method was
done by forming AgCl-NPs from Ag ions using aqueous
extract of brown algae (Sargassum boveanum) obtained from
the Persian Gulf Sea. This extract served as capping agent
during the formation of AgCl-NPs. Creation of AgCl-NPs
was confirmed by UV–visible spectroscopy, powder X-ray
diffraction, energy-dispersive X-ray spectroscopy, and highresolution
transmission electron microscopy, while the morphology
and size analyses were characterized using highresolution
transmission electron microscopy and dynamic
light scattering. After optimization of some experimental conditions,
particularly pH, a simple and facile system was developed
for the naked-eye detection of bisphenol-A. Moreover, a
theoretical study of AgCl interaction with bisphenol-A was
performed at the density functional level of theory in both
gas and solvent phases. Theoretical results showed that electrostatic
and van der Waal interactions play important roles in
complexation of bisphenol-Awith AgCl-NPs, which can lead
to aggregation of the as-prepared AgCl-NPs and results in
color change from specific yellow to dark purple, where a
new aggregation band induced at 542 nm appears. The absorbance
at 542 nm was found to be linearly dependent on the
bisphenol-A concentration in the range of 1 × 10?6–1 ×
10?4 M, with limit of detection of 45 nM. In conclusion, obtained
results from the present study can open up an innovative
application of the green synthesis of AgCl-NPs using
brown algae extract as colorimetric sensors
|