How the Anatase-to-Rutile Ratio Influences the Photoreactivity of TiO2
Journal article, 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

Author

R. Su

Aarhus University

R. Bechstein

Aarhus University

L. So

Aarhus University

R. T. Vang

Aarhus University

M. Sillassen

Aarhus University

Björn Neo Esbjörnsson Elgh

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

Anders Palmqvist

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

F. Besenbacher

Aarhus University

Journal of Physical Chemistry C

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

Vol. 115 49 24287-24292

Subject Categories

Chemical Sciences

DOI

10.1021/jp2086768

More information

Latest update

2/28/2018