Issue 31, 2012

Crystallization induced porosity control and photocatalytic activity of ordered mesoporous TiO2

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.

Graphical abstract: Crystallization induced porosity control and photocatalytic activity of ordered mesoporous TiO2

Article information

Article type
Paper
Submitted
09 Jul 2012
Accepted
02 Oct 2012
First published
03 Oct 2012

RSC Adv., 2012,2, 11969-11975

Crystallization induced porosity control and photocatalytic activity of ordered mesoporous TiO2

C. W. Kim, U. Pal, S. Park, Y. H. Kim, J. Kim and Y. S. Kang, RSC Adv., 2012, 2, 11969 DOI: 10.1039/C2RA21391E

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