Degradation of Methylene Blue Using Biologically Synthesized Silver Nanoparticles

Abstract

Nowadays plant mediated synthesis of nanoparticles has great interest and achievement due to its eco-benign and low time consuming properties. In this study silver nanoparticles were successfully synthesized by using Morinda tinctoria leaf extract under different pH. The aqueous leaf extract was added to silver nitrate solution; the color of the reaction medium was changed from pale yellow to brown and that indicates reduction of silver ions to silver nanoparticles. Thus synthesized silver nanoparticles were characterized by UV-Vis spectrophotometer. Dispersity and morphology was characterized by scanning electron microscope (SEM); crystalline nature and purity of synthesized silver nanoparticles were revealed by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX). FTIR spectrum was examined to identify the effective functional molecules responsible for the reduction and stabilization of silver nanoparticles synthesized by leaf extract. The photocatalytic activity of the synthesized silver nanoparticles was examined by degradation of methylene blue under sunlight irradiation. Green synthesized silver nanoparticles were effectively degrading the dye nearly 95% at 72 h of exposure time.

Photobiological synthesis of noble metal nanoparticles using Hydrocotyle asiatica and application as catalyst for the photodegradation of cationic dyes

“…This may be due to the interaction of AgNPs with dye molecules or any other intermediates formed during the reaction. The same trend was found in the recent articles and the authors attributed no reason [38,39]. The intensity of peak at 246 nm decreased initially, after some time it started increasing in the reaction carried out in absence of light, but no such trend is observed in the light reaction.…”

“…By fabricating appropriately nanostructured materials that allow a reasonable fraction of these hot carriers to be harvested before they thermalize, the hot electrons can be transferred to appropriate catalyst systems and the material can be used to carry out light-enabled redox chemistry. Recently biosynthesized NPs have been reported to degrade organic dyes [36][37][38][39][40][41][42].…”

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“…Where C 0 is the initial concentration of the dye and C is the concentration of dye solution after photocatalytic degradation 40 .…”

Photocatalytic activity of biogenic silver nanoparticles synthesized using yeast (Saccharomyces cerevisiae) extract

“…These radicals break the organic dye into simpler organic molecules leading to the rapid degradation of the dye (Houas et al 2001;Ameta et al 2013). Therefore, the biosynthesized Ag nanoparticles may act as a stable and efficient photocatalyst for degradation of methylene blue under visible light irradiation (Vanaja et al 2014).…”