Novel method for preparation of high visible active N-doped TiO2 photocatalyst with its grinding in solvent

In Cheol Kang, Qiwu Zhang, Shu Yin, Tsugio Sato, Fumio Saito

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

This work is focused on improvement on the photo-catalytic activity of a N-doped TiO2 (reference sample) by its grinding in solvent. Grinding the reference sample in solvent was performed by using a planetary mill at 200 rpm and 15 min grinding time with one of various solvents such as ethanol, ethyl acetate dehydrated (EAD), hexane and water. The ground samples were dried at 80 °C to remove the residual solvents. The prepared sample was characterized by a series of analytical methods including X-ray diffraction (XRD), specific surface area (SSA), particle size, Fourier transform infrared spectroscopy (FT-IR), thermogravimeter mass spectrometer (TG-MS), X-ray photoelectron spectroscopy (XPS), Chemiluminescence as well as the photo-catalytic activity with NO gas decomposition. The prepared sample ground in ethanol showed much improved photocatalytic activity in the wavelength of visible light region, in comparison with the activity of the reference sample. This may be due to the existence of abundant electrons on Ti3+/oxygen vacancy sites, which may be generated via current-doubling effect during the dry operation. On the contrary, the sample prepared in EAD showed the worsened photocatalytic activity in visible wavelength region, due to the existence of acetate complex on the surface of the sample as a surface impurity.

Original languageEnglish
Pages (from-to)570-576
Number of pages7
JournalApplied Catalysis B: Environmental
Volume84
Issue number3-4
DOIs
Publication statusPublished - 2008 Dec 1

Keywords

  • Current-doubling effect
  • Ethanol
  • Grinding
  • Surface modification
  • TiO photocatalyst

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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