Green Synthesis of Silver Nanoparticles Using Tea Polyphenols and Their Catalytic Activity in Degradation of Acid Red B

Abstract

An efficient, simple and environmental friendly method has been developed to prepare silver nanoparticles (AgNPs) using tea polyphenols in the silver nitrate solution. The tea polyphenols acted as both reducing (from Ag+ to Ag0) and capping agent in the liquid phase. The synthesized AgNPs were characterized with UV-visible absorption spectrum, TEM, EDS spectrum and particles size distribution analysis. UV-visible absorption spectrum indicated a significant absorption peak at 425 nm related to the great synthesis of AgNPs in the aqueous solution. TEM images confirmed a typical spherical and an ellipsoidal morphology of AgNPs. Furthermore, the catalytic efficiency of synthesized AgNPs was evaluated for the reduction/degradation of hazardous acid dye using NaBH4 as reducing agent. The AgNPs showed excellent catalytic activity in the degradation of Acid Red B by NaBH4, and 75% Acid Red B was catalytic degraded within 20 minutes.