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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/039/06/1569-1579

    • Keywords

       

      Carbon-modified titanium dioxide; synthesis; nanostructure; spectroscopy; optical and photocatalytic properties.

    • Abstract

       

      A morphology-controlled facile synthesis of titanium-glycolate precursors with subsequent annealing in He and air atmospheres has been exploited for the production of nanostructured composite globules, whiskers and plates of C-modified titanium dioxide. Characterisation tests proved the as-obtained globule composites to exclusively exhibit high-specific surface area (up to 150–170 m$^2$ g$^{−1}$), thus being useful for photocatalytic applications inthe visible-light region. The combination of the electron paramagnetic resonance, X-ray photoelectron spectroscopy, absorption spectroscopy and transmission electron microscopy revealed the presence of three kinds of carbon in the globules: a small bandgap (with measured width of 0.8 eV) amorphous carbon surrounding the anatase nanocrystallites,C-containing radicals including carbonates on the surface of TiO$_2$ and interstitial carbon in the oxygen position of the TiO$_2$ lattice. It was found that the maximum visible-light photocatalytic activity of the globules is determinedby the optimal surface concentration of amorphous carbon of about 0.002 wt.% m$^{−2}$. Under these conditions, the highest synergic photosensitising effect on TiO$_2$ nanocrystallites of all three kinds of carbon is expected.

    • Author Affiliations

       

      V N KRASIL’NIKOV1 E V SHALAEVA1 I V BAKLANOVA1 M A MELKOZEROVA1 M V KUZNETSOV1 E V ZABOLOTSKAYA1 O I GYRDASOVA1 L YU BULDAKOVA1 A M MURZAKAEV2

      1. Institute of Solid State Chemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russian Federation
      2. Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation

    • Dates

       
      Published
      15 October 2016
      Manuscript received
      29 April 2015
      Accepted
      4 April 2016

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

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