Characterization and photocatalytic activity of Ni-doped TiO 2 nano photocatalysts prepared by low temperature combustion synthesis

Chao Liu*, Xin Hu Tang, Ce Hui Mo, Jun Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Ni-doped TiO 2 photocatalysts were prepared by low temperature combustion synthesis and some properties, such as optical absorption, crystal type, grain size distribution and chemistry transformation during temperature rising were characterized by UV-Vis DRS, X-ray diffraction (XRD), laser light dispersion grain size measurement machine and TG-DSC respectively. The photocatalytic activities of the prepared photocatalysts under visible light irradiation were evaluated by monitoring the degradation of methylene blue dye, a probe pollutant. The results indicate that the Ni-doped TiO 2 photocatalysts prepared by low temperature combustion synthesis shift the optical absorption threshold to visible light, the band gap of 0.4 Ni-TiO 2 (atomic ratio) is 2.3 eV, which corresponds to a 564nm threshold in the visible light range. The crystal type of photocatalyst is anatase TiO 2 and the content of NiTiO 3 rise with the increase of Ni dopant. The grain size of photocatalyst distributes from 50 to 150nm, which account for 96.9% of entire quantity. During temperature rising, the TiO 2 phase in photocatalyst transforms from amorphous structure to anatase and NiTiO 3 crystallites appear at 445.2°C. After 150 min visible light irradiation, 93.9% of methylene blue dye are degraded over 0.4 Ni-TiO 2 photocatalyst. The photocatalytic activity of Ni doped TiO 2 is higher than that of P25 under identical conditions.

Original languageEnglish (US)
Pages (from-to)2150-2153
Number of pages4
JournalHuanjing Kexue/Environmental Science
Volume27
Issue number11
StatePublished - Nov 1 2006

Keywords

  • Characterization
  • Low temperature combustion synthesis
  • Methylene blue
  • Ni doping
  • TiO
  • Visible light

ASJC Scopus subject areas

  • Environmental Science(all)

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