Catalytic Reduction of 4-Nitrophenol using Biogenic Gold and Silver Nanoparticles Derived from Breynia rhamnoides

A simple, green method is described for the synthesis of Gold (Au) and Silver (Ag) nanoparticles (NPs) from the stem extract of Breynia rhamnoides. Unlike other biological methods for NP synthesis, the uniqueness of our method lies in its fast synthesis rates (∼7 min for AuNPs) and the ability to tu...

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Bibliographic Details
Published in:Langmuir 2011-12, Vol.27 (24), p.15268-15274
Main Authors: Gangula, Abilash, Podila, Ramakrishna, M, Ramakrishna, Karanam, Lohith, Janardhana, Chelli, Rao, Apparao M
Format: Article
Language:English
Subjects:
Aminophenols - analysis
Aminophenols - chemical synthesis
Borohydrides - chemistry
Catalysis
Chemistry
Colloidal state and disperse state
Euphorbiaceae - chemistry
Exact sciences and technology
General and physical chemistry
Gold - chemistry
Green Chemistry Technology
Kinetics
Materials: Nano-and Mesostructured Materials, Polymers, Gels, Liquid Crystals, Composites
Metal Nanoparticles - analysis
Metal Nanoparticles - chemistry
Metal Nanoparticles - ultrastructure
Microscopy, Electron, Transmission
Nanotechnology - methods
Nitrophenols - chemistry
Oxidation-Reduction
Particle Size
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Plant Extracts - chemistry
Plant Stems - chemistry
Silver - chemistry
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis
Surface Plasmon Resonance
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:A simple, green method is described for the synthesis of Gold (Au) and Silver (Ag) nanoparticles (NPs) from the stem extract of Breynia rhamnoides. Unlike other biological methods for NP synthesis, the uniqueness of our method lies in its fast synthesis rates (∼7 min for AuNPs) and the ability to tune the nanoparticle size (and subsequently their catalytic activity) via the extract concentration used in the experiment. The phenolic glycosides and reducing sugars present in the extract are largely responsible for the rapid reduction rates of Au3+ ions to AuNPs. Efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of AuNPs (or AgNPs) and NaBH4 was observed and was found to depend upon the nanoparticle size or the stem extract concentration used for synthesis.
ISSN:0743-7463
1520-5827
DOI:10.1021/la2034559