1. Biosynthesized Gold Nanocatalyst Using Ginkgo Biloba Fruit Extract for Efficient Catalytic Degradation of Azo Dyes.
- Author
-
Liu, Ying, Liu, Huihong, and Mahmud, Sakil
- Abstract
Gold nanoparticles (AuNPs) are increasingly utilized for their opto‐electrical properties in various high‐tech applications, including electronic conductors, sensory probes, and drug delivery systems. However, their widespread application is limited by their tendency to agglomerate. In this study, AuNPs were synthesized using a cleaner approach and stabilized with Ginkgo biloba fruit extract (GBFE), avoiding toxic agents. The synthesis parameters were optimized using a one‐variable‐at‐a‐time technique, resulting in primarily spherical/oval particles with high crystallinity (d‐spacing=0.204–0.231 nm), nano‐scale size (10.3±2.9 nm), and remarkable stability (zeta potential of −20.06 mV). The synthesis mechanism involved a redox reaction between phytochemicals and metal cations, leading to the generation and stabilization of AuNPs. The AuNPs exhibited catalytic activity in reducing two azo compounds, i. e. reactive yellow 179 (RY179) and reactive orange 5 (RO5) as the models, achieving a degradation rate of over 98 % within 15 minutes. The kinetic rate constants (k) for RY179 and RO5 were calculated as 0.2771 min−1 and 0.2297 min−1, respectively. The AuNPs alone could not degrade azo dyes since NaBH4 was required to provide a source of electrons for transferring to the dye molecules. This eco‐friendly synthesis method demonstrates the potential for synthesizing catalytically active AuNPs for various industrial applications, including wastewater treatment. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF