Silver Nanoparticles Synthesized by Orange Peel Extract

Abstract

The current work is presenting the biosynthesis of silver nanoparticles, using AgNO3 as a precursor and orange peel extract as reducer and stabilizer agent. The research structure is based on the synthesis process, from extract preparation, precursor, to final colloidal solutions. The samples were prepared in a ratio of 9:1, precursor to plant extract. The first signs of successful synthesis appeared in about 30 minutes, when the formation of nanoparticles was assigned to a change in colour, from pale yellow to brown. After the synthesis steps, the obtained samples were characterized by UV-Vis spectrophotometry. This analysis has indicated an absorbance peak with highest intensity around 420 nm wavelength. This is matching with surface plasmon resonance of silver nanoparticles, being the first step in proving that silver nanoparticles were formed in the colloidal solution. The removal of toxic elements from the synthesis stages opens new opportunities for the use of particles, there these are intended to be used in medicine and water treatment, afterwards testing antimicrobial and photocatalysis potential. Moreover, this method of obtaining nano-scale particles is an efficient and economical one.