Green Synthesis Of Silver Nanoparticles Using Curcuma Xanthorrhiza Rhizome Extract
Loading...
Date
2021-06-14
Authors
Deva, Nathan
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The employment of plant extract in the synthesis process of silver nanoparticles
is the recent advancement in green chemistry and garnering great interest among
researchers worldwide. This study mainly emphasizes on green synthesis of silver
nanoparticles using Curcuma xanthorrhiza (C. xanthorrhiza) rhizome extract, which
acts as a reducing and capping agent. Silver ions in the silver nitrate solution can be
reduced into zero valence silver nanoparticles when the rhizome extract is mixed. The
reduction of silver ions resulted in color changes in the mixture from yellow to dark
brown due to the surface plasmon resonance (SPR) phenomenon. Thus, several
parameters influencing the green synthesis of silver nanoparticles were optimized by
manipulating variables in the experiment. Then, the synthesized silver nanoparticles
were characterized via analytical equipment such as UV-Visible spectrometer and
Energy Dispersive X-ray (EDX) spectrometer. The UV-Vis spectrum of the silver
nanoparticles was obtained, and the maximum absorption peak was acquired at a
wavelength in the range of 445 to 450 nm. Hence, the best conditions for synthesizing
silver nanoparticles were determined and found to be 8 wt % rhizome extract
concentration, 8 mM silver nitrate solution concentration, 1:5 rhizome extract to silver
nitrate solution volume ratio, and 72 hours of incubation time. Furthermore, the EDX
analysis of silver nanoparticles demonstrated a spectrum of elemental composition in
which silver has the highest peak at 3 keV. Several other compounds in the spectrum
indicate the presence of biomolecules from the extract on the surface of nanoparticles
as a stabilizing agent. These results showed that the reduction process of silver ions
using C. xanthorrhiza rhizome extract is a greener method with less toxicity and can
form more refined and stable nanoparticles.