Abstract
The present study focuses on minimized use of chemical and physical methods and to develop environmentally safer method for the sunlight mediated synthesis of silver nanoparticles (SNPs) using aqueous root extract of Decalepis hamiltonii (DHR). Phytochemicals present in DHR extract was screened using qualitative and quantitative methods. Response Surface Methodology (RSM) was used in order to statistically optimize the processing parameters like concentration of root extract, silver nitrate and pH of the solution in order to obtain high yield of SNPs. The characterization techniques revealed hydrodynamic size of SNPs with the diameter of 61 nm, 46.5 nm width and zeta potential of −10.4 mv indicating the presence of functional groups on the SNPs which was also confirmed by Fourier transform infrared spectroscopy (FTIR) studies. Further, Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) revealed uniform spherical shape of SNPs. The presence of metallic silver was confirmed by Energy Dispersive X-ray (EDX). Additionally, the study revealed DHR extract and its colloidal SNPs showed a potential antioxidant activity. Further, the SNPs were tested as a Nano-catalyst in dye degradation of brilliant blue (BB), callomil yellow (CY), congo red (CR), methyl orange (MO), and methyl red (MR) and it showed 98 to 100% dye degradation.
Published Version
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