Journal
JOURNAL OF CHEMICAL SCIENCES
Volume 128, Issue 12, Pages 1871-1878Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12039-016-1189-7
Keywords
Green synthesis; curcumin stabilized silver nanoparticles; p-nitrophenol; catalytic kinetics; Langmuir-Hinshelwood model
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Funding
- UGC
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An ultrasonication based green synthesis approach was used to prepare curcumin-stabilized silver nanoparticles (c-AgNPs). Nanoparticles thus obtained were characterized by UV-Visible spectroscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR). Two different size distributions of c-AgNPs were obtained by changing the ratio of curcumin to silver salt precursor. These c-AgNPs were used as catalysts in the catalytic reduction of p-nitrophenol to p-aminophenol. The c-AgNPs with narrower size distribution exhibited better catalytic activity as well as lower activation energy. Variation of apparent rate constant with the reactant concentration agreed with the Langmuir-Hinshelwood (LH) model. Consequently, the surface rate constant related to the rate-determining step and the respective adsorption constants of p-nitrophenol and of borohydride were determined as per this model.
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