Jump to main content
Jump to site search

Issue 22, 2012
Previous Article Next Article

Control of the crystallinity in TiO2 microspheres through silica impregnation

Author affiliations

Abstract

The crystal grain size as well as the crystallinity in nanoscale TiO2 have been determined to be of importance to the photocatalytic activity, however it is difficult to control while maintaining a high surface area. Here we demonstrate the synthesis of anatase titania microspheres with controllable grain sizes, which are obtained by impregnating the porous networks of amorphous titania microspheres with silicate oligomers through the addition and hydrolysis of the precursor tetraethyl orthosilicate (TEOS) and calcining the obtained composite. Varying the amount of TEOS added controls to the degree of silicate impregnation, which restricts the anatase grain growth during calcination and enables the tuning of the grain size from 4–25 nm while maintaining a spherical morphology. The silica is then removed through base etching in order to utilize the microspheres. The photocatalytic performance of microspheres with enhanced crystallinity is tested using the model system of the degradation of Rhodamine B under UV irradiation and the rate constants determined are compared against the surface area and grain size of the microspheres to determine optimal conditions.

Graphical abstract: Control of the crystallinity in TiO2 microspheres through silica impregnation

  • This article is part of the themed collection: Nanocrystals
Back to tab navigation

Supplementary files

Publication details

The article was received on 22 May 2012, accepted on 16 Jul 2012 and first published on 16 Jul 2012


Article type: Paper
DOI: 10.1039/C2CE25799H
Citation: CrystEngComm, 2012,14, 7680-7685
  •   Request permissions

    Control of the crystallinity in TiO2 microspheres through silica impregnation

    M. Dahl, S. Dang, J. Bong Joo, Q. Zhang and Y. Yin, CrystEngComm, 2012, 14, 7680
    DOI: 10.1039/C2CE25799H

Search articles by author

Spotlight

Advertisements