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      https://www.ias.ac.in/article/fulltext/jcsc/128/12/1871-1878

    • Keywords

       

      Green synthesis; curcumin stabilized silver nanoparticles; p-nitrophenol; catalytic kinetics; Langmuir-Hinshelwood model.

    • Abstract

       

      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.

    • Author Affiliations

       

      A D VERMA1 N JAIN1 S K SINGHA2 M A QURAISHI1 I SINHA1

      1. Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh 221 005, India
      2. Indian School of Mines, Dhanbad, India
    • Dates

       
  • Journal of Chemical Sciences | News

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