Preparation of highly ordered titanium dioxide porous films: Characterization and photocatalytic activity

Ruey an Doong*, Su-Min Chang, Yu chin Hung, I. ling Kao

*Corresponding author for this work

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

The highly ordered titanium dioxide (TiO 2) porous films was fabricated by a single-step assembly method in which the fabrication of opal structure and the infiltration of TiO 2 sol particles into the voids between templates were carried out simultaneously. The polystyrene microspheres with diameters ranging between 480 and 1000 nm were used as the template, and titanium tetrabutoxide, a precursor of TiO 2, was prepared in an acidic solution to fill the voids between the template microspheres during the formation of opal structure. The properties of the highly ordered TiO 2 porous materials were examined by scanning electron microscopy (SEM), thermogravimetry (TA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and specific surface area analyzer. Thermal analyses showed that polystyrene can be completely removed at 425 °C and the phase transformation of TiO 2 from amorphous to crystalline anatase occurred at 360 °C. SEM images clearly demonstrated that these films have a highly ordered three-dimensional porous structure arranged mainly in hexagonal orientation. The XRD patterns indicated that the crystalline phase of TiO 2 is mainly anatase with crystallite sizes of 7.0-9.7 nm. In addition, the ratio of rutile to anatase increased slightly with the increase in hole diameters of the ordered TiO 2 porous films. The specific surface areas of the ordered TiO 2 porous film ranged between 59 and 84 m 2 g -1, and the determined adsorption pore sizes in walls between templates were in the range 5.1-6.0 nm, which indicates that the fabricated TiO 2 film is a macrostructured mesoporous material. The ordered TiO 2 porous films showed high photocatalytic activity in degradation of methylene blue (MB) solution. The degradation rate increased linearly with the increase in hole diameters of the TiO 2 films ranging between 480 and 1000 nm. Results obtained in this study clearly show the feasibility of using one-step method to fabricate the highly ordered TiO 2 materials as potential supports for heterogeneous catalysis.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalSeparation and Purification Technology
Volume58
Issue number1
DOIs
StatePublished - 1 Dec 2007

Keywords

  • Ordered TiO porous films
  • Photocatalytic activity
  • Sol-gel
  • Template

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