Green Route for Silver Nanoparticles Synthesis by Raphanus Sativus Extract in a Continuous Flow Tubular Microreactor

Abstract

The present work deals with the investigation of the greener route for the production of silver nanoparticles using Raphanus sativus (R. sativus) bioextract in a continuous flow tubular microreactor. The parameters affecting the particle size and distribution were investigated. From the results obtained it can be inferred that the ascorbic acid (reducing agent) present in the R. sativus bioextract is responsible for the reduction of silver ions. At optimum condition, the particle size distribution of nanoparticles is found between 18[Formula: see text]nm and 39[Formula: see text]nm. The absorbance value was found to be decreased with an increase in the diameter of the microreactor. It indicates that a number of nuclei are formed in the micrometer sized (diameter) reactor because of the better solute transfer rate leading to the formation of large number of silver nanoparticles. The study of antibacterial activity of green synthesized silver nanoparticles shows effective inhibitory activity against waterborne pathogens, Shegella and Listeria bacteria.

Process Intensification Approach Using Microreactors for Synthesizing Nanomaterials—A Critical Review

“…They reported that as the diameter of the channels was altered, the morphology of synthesized nanoparticles was influenced due to changes in mass transfer. A plant extract was used as a reducing agent in the preparation of Ag nanoparticles in a tubular microreactor by Jolhe et al [50]. They concluded that the presence of ascorbic acid in the bio-extract of R. Sativus Gioria et al [48] synthesized palladium nanoparticles (PdNPs) by effective utilization of green reagents like glucose and starch.…”

An Ultrasound-Assisted Minireactor System for Continuous Production of TiO2 Nanoparticles in a Water-in-Oil Emulsion

“…At the same time, quick and low-cost synthesis is highly demanded. Minireactor technology has been in use for a long time. , The need to continuously synthesize monodisperse nanoparticles gave rise to the development of custom microfluidic devices. , Monodisperse silver nanoparticles have been rapidly synthesized in a continuous flow tubular microreactor by thermal reduction of a single-phase reactant (silver pentafluoropropionate dissolved in isoamyl ether) . Similarly, synthesis of gold nanoparticles having a narrow size distribution was carried out employing a continuous flow microreactor using separately injected chloroauric acid and ascorbic acid solutions .…”