Biogenic synthesis of AgNPs employing Terminalia arjuna leaf extract and its efficacy towards catalytic degradation of organic dyes

Abstract

In the present work, we demonstrated the biosynthesis of silver nanoparticles (AgNPs) by highly stable, economic and eco-friendly method using leaf extract of Terminalia arjuna (T. arjuna) and employing as a catalyst for the degradation of methyl orange (MO), methylene blue (MB), congo red (CR) and 4- nitrophenol (4-NP). The biosynthesis of AgNPs was visually validated through the appearance of reddish-brown color and further confirmed by the UV-spectra at 418 nm. The TEM and FE-SEM studies revealed the spherical shape of particles with size ranged between 10–50 nm. Face centered cubic crystalline nature of AgNPs was proved by XRD analysis. The negative value of zeta potential (−21.7) indicated the stability of AgNPs and elemental composition was confirmed by EDS. FT-IR analysis revealed the functional groups present in the plant extract trigger the biosynthesis of AgNPs. The AgNPs exhibited strong degradation of MO (86.68%), MB (93.60%), CR (92.20%) and 4NP (88.80%) by completing the reduction reaction within 20 min. The reaction kinetics followed the pseudo-first-order and displayed k-values (rate constant) 0.166 min−1, 0.138 min−1, 0.182 min−1 and 0.142 min−1 for MO, MB, CR and 4-NP respectively. This study showed an efficient, feasible and reproducible method for the biosynthesis of eco-friendly, cheap and long-time stable AgNPs and their application as potent catalysts against the degradation of hazardous dyes.

Catalytic Activity for Dye Degradation and Characterization of Silver/Silver Oxide Nanoparticles Green Synthesized by Aqueous Leaves Extract of Phoenix Dactylifera L.

“…The presence of amide groups of Ag/Ag2O NPs in the transfer of electrons from BH4anions to MB cations, which increases with increasing time, which was also similar to the previously reported micro Ag/Ag2O NPs [38][39][40][41][42][43][44][45] . The initial absorption peak at 663 nm gradually decreased over time, confirming the catalytic activity of the composite Ag/Ag2O NPs (Figure 14).…”

Dual Colorimetric Sensor for Hg2+/Pb2+ and an Efficient Catalyst Based on Silver Nanoparticles Mediating by the Root Extract of Bistorta amplexicaulis

“…The dark orange solution of methyl orange was being changed to a colorless solution within 15 min, and a significant decrease in the absorption intensity was also recorded. These results proposed that AgNPs cleaved the -N=N-functional group of methyl orange which subsequently decolorizes the target solution (Naseem et al, 2019;Raj et al, 2020). The BH −1 4 and methyl orange adsorb on the surface of nanoparticles in aqueous solution.…”

Tolerance and decolorization potential of duckweed (Lemna gibba) to C.I. Basic Green 4

“…The presence of the dye in the water reduces the penetration of light into the water (preventing light from reaching the lower layers of the water) 5 , 6 . Therefore, removal of all pollutants from wastewater is the main goal for mankind 7 . The conventional wastewater treatment technologies such as physical and chemical, are more expensive and introduce other toxic byproducts which are hazardous and required further processing 8 , 9 .…”