Template-free synthesis and photocatalytic activity of hierarchical porous titania with controlled texture and crystalline structure

Kaisheng Xia, Dean Ferguson, Yahia Djaoued, Jacques Robichaud, Nadéjda Tchoukanova, Ralf Brüning, Eric McCalla

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Hierarchical porous titanium dioxide is of great interest as a potential photocatalyst material because of its enhanced mass transfer capability and light capture efficiency. Tuning of these nanostructures allows for the design of new photocatalysts with improved performance. In this study, we report the synthesis of hierarchically meso-macroporous TiO2 materials through a template-free aqueous technique. Controlled porous textures and crystalline structures of TiO2 were obtained by varying the pH of the starting aqueous solution and the method of crystallization. The catalytic efficiency of these materials was investigated using photodegradation of methyl orange and the results show that specific surface area, pore volume and crystallinity play a key role in the photocatalytic performance. The hierarchical titania prepared by the hydrothermal method at a pH of 2 has the highest efficiency with an apparent reaction rate of 9.10 × 10-2 min-1, surpassing that of Degussa P25, hence showing its promising potential in environmental remediation.

Original languageEnglish (US)
Pages (from-to)231-241
Number of pages11
JournalApplied Catalysis A: General
Volume387
Issue number1-2
DOIs
StatePublished - Oct 20 2010

Keywords

  • Hierarchical porosity
  • Methyl orange
  • Photocatalysis
  • Titanium dioxide

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