Preparation of Metal Nanoparticles/Ionic Liquid Composites and Investigation of Their Catalytic Activity

Gharegozloo, Nazanin | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48935 (04)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Gholami, Mohammad Reza; Salari, Hadi
  7. Abstract:
  8. In this research Fe3O4 magnetic nanoparticles were prepared. To protect against oxidation, a shell of SiO2 was deposited on Fe3O4. Graphene oxide was prepared by the modified Hummer method and supported on the Fe3O4@SiO2 core-shell. Then, ionic liquid layer was impregnated on it. Afterward, PtAu nano alloy were synthesized on the surface of nanocomposite with the different molar ration including 100:0, 75:25, 50:50, 25:75 and 0:100. The as-prepared nanocomposite was characterized by SEM, XRD, and FT-IR analytical methods.For investigation of kinetically activity of catalysts, reduction of 4-nitrophenol with NaBH4 as reducer was used. The adsorption in different times was obtained by UV-vis spectrophotometer and spectrum of reduction processes was gained. Bimetallic nanocomposites had better catalytic activity than monometallics. Also, the ratio of 75:25 Pt-Au with high value rate constant, had the best kinetically activity. Due to the linearity of the charts for various catalysts, kinetics of reaction proved to be first-order. The effect of reductant concentration, and amount of catalyst were studied. The obtained results illustrated that the rate constants increasing by increasing concentration of reductant and amount of nanocomposite
  9. Keywords:
  10. Ionic Liquids ; Composite ; Catalytic Activity ; Metallic Nanoparticles ; Nanocomposite ; Magnetite Nanoparticle

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