Mo-doped TiO2with enhanced visible light photocatalytic activity: A combined experimental and theoretical study

Matiullah Khan, Junna Xu, Wenbin Cao, Zi Kui Liu

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Abstract

In this paper, the effects of Mo doping on the geometrical, electronic, optical, and photocatalytic properties of TiO2have been investigated theoretically and experimentally. The density functional theory based calculations show that Mo doping creates impurity states (Mo 4d) below the conduction band of TiO2and the Fermi level is pinned inside the conduction band verifying n-type doping nature of the Mo in TiO2, which enhances its visible light absorption. Anatase TiO2particles with Mo contents of 0.08, 0.1, 0.5, 1.0, 1.5 and, 2.0 at % were synthesized by hydrothermal method without any post heat treatment for crystallization. Experiment results show that Mo ions have been successfully doped into the TiO2lattice. The morphology of TiO2particles is nearly spherical and the grain size is uniformly distributed as about 10 nm. Synthesized sample with 0.1 at.% Mo doping concentration shows the best visible light photocatalytic activity due to the reduced band gap and improved electron-hole pairs separation. However, the photocatalytic activity of the sample with 2.0 at.% Mo is relatively low although its visible light absorption is the best among the samples. The enhanced recombination of electron-hole pairs caused by the excessive Mo doping concentration may account for it. Copyright

Original languageEnglish (US)
Pages (from-to)6865-6871
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume14
Issue number9
DOIs
StatePublished - Sep 1 2014

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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