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Synthesis, characterization, and application of monodisperse gelatin-stabilized silver nanospheres in reduction of aromatic nitro compounds

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Abstract

Monodisperse colloidal silver nanospheres were synthesized by the reaction of silver nitrate, hydroxylammonium hydrosulphate (NH2OH)2 · H2SO4 and sodium hydroxide in the presence of gelatin as stabilizer. Colloidal nanospheres were characterized by UV-vis absorption spectroscopy, transmission electron microscopy, X-ray diffraction and dynamic light scattering. X-ray diffraction data confirmed that the silver nanospheres were crystalline with face-centered-cubic structure. Transmission electron microscopy analysis revealed the formation of homogeneously distributed silver nanoparticles of spherical morphology and size of the nanoparticles was in the range of 0.7–5.2 nm. Silver nanospheres were stable for more than two months when stored at ambient temperature. Size and size distribution were studied by varying pH, reaction temperature, silver ion concentration in feed solution, concentration of reducing agent and concentration of the stabilizing agent. Catalytic activity of silver nanospheres was tested for the reduction reaction of nitro compounds in sodium borohydride solution. Monodisperse silver nanospheres showed excellent catalytic activity towards the reduction of aromatic nitro compounds. The reduction rate of aromatic nitro compounds had been observed to follow the sequence 4-nitrophenol > 2-nitrophenol > 3-nitrophenol.

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Authors and Affiliations

  1. Department of Chemical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, 395007, Gujarat, India

    R. Vadakkekara, M. Chakraborty & P. A. Parikh

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  1. R. Vadakkekara
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  2. M. Chakraborty
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  3. P. A. Parikh
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Correspondence to M. Chakraborty or P. A. Parikh.

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Vadakkekara, R., Chakraborty, M. & Parikh, P.A. Synthesis, characterization, and application of monodisperse gelatin-stabilized silver nanospheres in reduction of aromatic nitro compounds. Colloid J 76, 12–18 (2014). https://doi.org/10.1134/S1061933X14010153

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  • DOI: https://doi.org/10.1134/S1061933X14010153

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