Optimization strategy for green synthesis of silver nanoparticles (AgNPs) as catalyst for the reduction of 2,4-dinitrophenol via supported mechanism

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 ( λ max...

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Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-07, Vol.128 (7), Article 595
Main Authors: Abu-Dief, Ahmed M., Abdel-Rahman, Laila H., Sayed, M. A. Abd–El, Zikry, Mallak Megalea, Khalifa, Mohamed E., El-Metwaly, Nashwa M.
Format: Article
Language:English
Subjects:
Applied physics
Characterization and Evaluation of Materials
Chemical synthesis
Condensed Matter Physics
Face centered cubic lattice
Fourier transforms
Functional groups
Herbal medicine
Infrared spectroscopy
Machines
Manufacturing
Materials science
Nanoparticles
Nanotechnology
Optical and Electronic Materials
Optimization
Pattern analysis
Physics
Physics and Astronomy
Processes
Reaction time
Recyclability
Reduction
Silver
Spectrum analysis
Surfaces and Interfaces
Thin Films
Transmission electron microscopy
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Summary: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 ( λ 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 2θ of 38°, 44°, 64° and 77° 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 °C for extraction. The reduction of 2,4-dinitrophenol to 2,4-diaminophenol using NaBH 4 was carried out under the catalytic influence of AgNPs. The rate constant k (1 st cycle) was found to be 42 × 10 −3  min − 1 and 26 × 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. Graphical abstract
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05704-9