Crystallization induced porosity control and photocatalytic activity of ordered mesoporous TiO2

  • Kim C
  • Pal U
  • Park S
 et al. 
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Abstract

The evolution of the porous network in mesoporous TiO2 structures during the calcination induced crystallization process has been studied by transmission electron microscopy{,} small angle X-ray diffraction and N2 adsorption/desorption techniques. It has been observed that on increasing the calcination temperature{,} the mesoporous structures undergo phase transition from amorphous to crystalline and their porosity changes from the ordered to the disordered state{,} generating crystalline fragments or aggregated porous particles. The optimum calcination temperature required for fabricating ordered metal oxide meso-structures using a polymer template has been discussed. The ordered mesoporous TiO2 with a crystalline framework showed prolonged photocatalytic activity and repeated usage as an industrial photodegradation catalyst{,} advantageous to the commercial nanocrystalline TiO2 Degussa P25. Mechanisms of formation and deformation of mesoporous metal oxide crystalline frameworks are proposed.

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