How the Anatase-to-Rutile Ratio Influences the Photoreactivity of TiO2
Artikel i vetenskaplig tidskrift, 2011

In 1991, Bickley et al. proposed a synergetic effect between anatase and rutile in Degussa P25. Since then, there has been an intensive debate about the correctness of this proposal, the origin of the synergism, and the right polymorph composition. However, a comparison of pure titanium dioxide samples with various anatase-to-rutile ratios, but otherwise identical properties, is missing. In this paper, we report about a series of utterly pure, highly porous titanium dioxide films with identical grain sizes, surface areas, and crystallinity, but varying polymorph compositions. Photocatalytic oxidation of methylene blue was utilized to investigate the influence of the anatase-to-rutile ratio on the photoreactivity. We clearly observe the synergetic effect within a well-defined range of anatase-to-rutile ratios. A film with similar to 60% anatase and similar to 40% rutile exhibits optimal performance at a 50% improved activity compared with pure anatase.

nanoparticles

mixed-phase titania

surface

low-temperature

organic-compounds

oxidation

photocatalytic activity

degradation

dioxide

photodegradation

Författare

R. Su

Aarhus Universitet

R. Bechstein

Aarhus Universitet

L. So

Aarhus Universitet

R. T. Vang

Aarhus Universitet

M. Sillassen

Aarhus Universitet

Björn Neo Esbjörnsson Elgh

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Anders Palmqvist

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

F. Besenbacher

Aarhus Universitet

Journal of Physical Chemistry C

1932-7447 (ISSN) 1932-7455 (eISSN)

Vol. 115 24287-24292

Ämneskategorier

Kemi

DOI

10.1021/jp2086768