Title
Combined <tex>$TiO_{2}/SiO_{2}$</tex> mesoporous photocatalysts with location and phase controllable <tex>$TiO_{2}$</tex> nanoparticlesCombined <tex>$TiO_{2}/SiO_{2}$</tex> mesoporous photocatalysts with location and phase controllable <tex>$TiO_{2}$</tex> nanoparticles
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Physics
Research group
Electron microscopy for materials research (EMAT)
Laboratory of adsorption and catalysis
Department of Chemistry
Publication type
article
Publication
Amsterdam,
Subject
Physics
Chemistry
Source (journal)
Applied catalysis : B : environmental. - Amsterdam
Volume/pages
88(2009):3/4, p. 515-524
ISSN
0926-3373
ISI
000266513400032
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Combined TiO2/SiO2 mesoporous materials were prepared by deposition of TiO2 nanoparticles synthesised via the acid-catalysed solgel method. In the first synthesis step a titania solution is prepared, by dissolving titaniumtetraisopropoxide in nitric acid. The influences of the initial titaniumtetraisopropoxide concentration and the temperature of dissolving on the final structural properties were investigated. In the second step of the synthesis, the titania nanoparticles were deposited on a silica support. Here, the influence of the temperature during deposition was studied. The depositions were carried out on two different mesoporous silica supports, SBA-15 and MCF, leading to substantial differences in the catalytic and structural properties. The samples were analysed with N2-sorption, X-ray diffraction (XRD), electron probe microanalysis (EPMA) and transmission electron microscopy (TEM) to obtain structural information, determining the amount of titania, the crystal phase and the location of the titania particles on the mesoporous material (inside or outside the mesoporous channels). The structural differences of the support strongly determine the location of the nanoparticles and the subsequent photocatalytic activity towards the degradation of rhodamine 6G in aqueous solution under UV irradiation.
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