Thermal influence on the structure and photocatalytic activity of mesoporous titania consisting of TiO2(B)

Teruhisa Hongo, Atsushi Yamazaki

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Mesoporous titania was synthesized using the evaporation-induced self-assembly method. The sample calcined at 300 °C had a wormhole-like structure with uniform mesopores consisting of TiO2(B). The sample calcined at 350 °C consisted of a mixed phase of TiO2(B) and anatase; however, the mesoporous structure showed little change compared with that of the sample calcined at 300 °C because the phase transition from TiO2(B) to anatase has a displasive phase transition mechanism with no atomic diffusion and accompanying no crystallite growth. When calcined above 400 °C, the mesoporous structure collapsed, and aggregates of anatase nanoparticles that were highly crystalline and had high specific surface area were obtained because the mesopores at several nm intervals inhibit anatase particle growth. Samples calcined at 300, 350, 400, and 450 °C showed 1.5, 2.4, 2.5, and 1.8 times higher photocatalytic activity than commercial titania P-25 in acetic acid decomposition.

Original languageEnglish
Pages (from-to)316-321
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume142
Issue number1
DOIs
Publication statusPublished - 2011 Jun 1

Keywords

  • Anatase
  • Mesoporous titania
  • Phase transition
  • Photocatalyst
  • TiO(B)

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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