WASTE TO VALUABLE MATERIALS: GREEN SYNTHESIS OF SILVER NANO-RODS FROM SPENT COFFEE GROUND EXTRACT

Green synthesis of metal nanoparticles is a promising approach to producing nanoparticles using natural and environmentally friendly resources. It involves the use of various biological agents such as fungi, bacteria, algae, and plants. This method avoids the use of toxic chemicals and reduces the environmental impact of conventional methods of nanoparticle synthesis. Green synthesis of silver nanoparticles (AgNPs) has potential applications in biomedical, environmental, and industrial fields. Conventional coffee brewing techniques produce large quantities of spent coffee grounds that contain bioactive compounds. Silver nano-rods (AgNRs) have been synthesized from filter coffee waste. This is the first report about the synthesis of AgNRs shape from spent coffee ground (SCG). The reduction of Ag (I) to Ag (0) was achieved by spent coffee ground aqueous extract. The obtained nanostructures were characterized by ultraviolet spectroscopy (UV-Vis), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). They showed a SPR band at a wavelength of 445 nm. The SEM images demonstrated that AgNRs generally contained a rod shape and average size of 100 nm. Elemental composition of AgNRs was analyzed by EDX. A strong peak was observed at around 3 and 3.5 keV. X-ray diffraction (XRD) patterns revealed the crystalline structure of AgNRs. The shape or size of the nanoparticles has an important role in all nanotechnology applications. It was presented a perspective for usage of spent coffee as a valuable material with great potential of application in medicine, pharmacy, and electronic industries. Green synthesized AgNRs from spent coffee may become promising candidates for nano opto-electronics and nanosensors due to their conductivity.