Improvement of TiO 2 photocatalytic properties under visible light by WO 3 /TiO 2 and MoO 3 /TiO 2 composites

Shouli Bai, Haiyan Liu, Jianhua Sun, Ye Tian, Song Chen, Jingli Song, Ruixian Luo, Dianqing Li, Aifan Chen, Chung Chiun Liu

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

The WO 3 /TiO 2 or MoO 3 /TiO 2 composites with different compositions have been prepared by a facile sol-gel method. The obtained composites were characterized using X-ray diffraction (XRD), BET surface area analysis, electron dispersion spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) emission spectrum. The research results show that BET specific surface areas of the composites are significantly enhanced and the composites possess higher photocatalytic activity than pure TiO 2 for the degradation of Rhodamine B (RhB) under visible light irradiation. It has been demonstrated that the photocatalytic activity depends on the composition and calcination temperature of composites, and degradation conditions for RhB. The improvement of photocatalytic activity can be attributed to the reduction of the electron-hole recombination rate due to the formation of WO 3 /TiO 2 or MoO 3 /TiO 2 heterostructures, which have been confirmed by XPS and PL spectra.

Original languageEnglish
Pages (from-to)61-68
Number of pages8
JournalApplied Surface Science
Volume338
DOIs
StatePublished - 30 May 2015

Keywords

  • MoO /TiO
  • Photocatalysis
  • Rhodamine B
  • Visible light
  • WO /TiO

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