Abstract
Here, we examine the biogenic fabrication of silver nanoparticles (AgNPs) utilizing a simple and environmental friendly method. Silver nanoparticles were synthesized using medicinal plants extracts such as Flamboyant (Delonix regia (DRE)) and Moringa oleifera (MOE). The maximum absorbance (lambda(max)) of UV-Vis. analysis at 442 and 459 nm indicates the formation of MOEAgNPs and DREAgNPs, respectively. The AgNPs are confirmed by UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), Transmission Electron Microscopy (TEM) and XRD techniques. (FT-IR) FT-IR spectra indicate the functional groups of phytochemical compounds in silver nanoparticles (DREAgNPs, MOEAgNPs). The generation of spherical MOEAgNPs and DREAgNPs with a majority particle size of 50 and 100 nm, respectively, was confirmed by TEM analysis. The XRD pattern of AgNPs has FCC form and crystalline lattice at 20 of 38 degrees, 44 degrees, 64 degrees and 77 degrees corresponding to (111), (200), (220), and (311) reflections of AgNPs. The findings indicate that the ideal conditions for the synthesis process were 2 mMAg(+) concentration, reaction time is 24 h and 60 degrees C for extraction. The reduction of 2,4-dinitrophenol to 2,4-diaminophenol using NaBH4 was carried out under the catalytic influence of AgNPs. The rate constant k (1s t cycle) was found to be 42 x 10(-3) min(-1) and 26 x 10(-3) min(-1) for the reaction in presence of MOEAgNPs and DREAgNPs, respectively. The recyclability of the prepared AgNPs was tested for 7 cycles without loss in its activity until cycle 5. The activation energy (E-a) for reduction of 2,4-dinitrophenol that catalyzed by MOEAgNPs or DREAgNPs, respectively, was 36.4 or 31.7 kJmol(-1). The successes of AgNPs in the catalytic role were supported through DFT studies.
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