Synthesis, kinetics and photocatalytic study of ultra-small Ag-NPs obtained by a green chemistry method using an extract of Rosa 'Andeli' double delight petals

This paper reports the effect of different concentrations of Rosa 'Andeli double delight petals aqueous extract (PERA) in the synthesis olsilver nanoparticles (Ag-NPs), using an easy green chemistry method. Its kinetics study and photocatalytic activity were also evaluated. The Ag-NPs were obtained using an aqueous silver nitrate solution (AgNO3) with 9.66% w/v, 7.25% w/v, and 4.20% w/v PERA as both reducing-stabilizing agent. The formation of the Ag-NPs was demonstrated by analysis of UV-vis spectroscopy, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). TEM analysis shows spherical nanoparticles in shape and size between -,0.5 and 1.4 am. A comparative study was done to determine which concentration was the best reducing-stabilizing agent, and we found out that ultra-small nanoparticles (0.5-1.1 am) were obtained with 9.66% w/v of PERA. The size of the Ag-NPs depends on the concentration of PERA and Ag(I). The reaction of formation of ultra-small Ag-NPs, proved to be first order for metallic precursor (silver) and second order for reducing-stabilizing agent (PERA). The Ag-NPs showed photocatalytic activity, in degradation of commercial dye with an efficiency of 95%. (C) 2015 Elsevier Inc. All rights reserved.