• Self-assembling behaviour of Pt nanoparticles onto surface of TiO2 and their resulting photocatalytic activity

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    • Keywords


      TiO2; sol–gel synthesis; photocatalysis; photodeposition; photocatalytic activity.

    • Abstract


      In the present study, self-assembling behaviour of guest nanoparticles (platinum) onto the surface of host support (titanium dioxide) during photodeposition process as a function of solution pH has been explored in detail by means of transmission electron microscope (TEM). The photocatalytic activity of the resulting bimetallic nanoassembly (Pt/TiO2) was evaluated by studying the degradation of two organic pollutants viz. triclopyr and methyl orange. Microscopic studies revealed that the deposition and/or distribution of Pt nanoparticles onto the surface of TiO2 were strongly guided by the ionization state of support which in turn was regulated by the solution pH of photodeposition process. A direct relationship between the solution pH of deposition process and the photocatalytic activity of resulting bimetallic catalyst has been observed. A mechanism based on the interparticle interaction between TiO2 and hydrolytic products of metal ions has been proposed for the differences in the photocatalytic activity of the resulting nanocomposite.

    • Author Affiliations


      M Qamar1 Ashok K Ganguli1

      1. Department of Chemistry, Indian Institute of Technology, New Delhi 110 016, India
    • Dates

  • Bulletin of Materials Science | News

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