Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 23274-23278 |
| Seitenumfang | 5 |
| Fachzeitschrift | Journal of Physical Chemistry B |
| Jahrgang | 109 |
| Ausgabenummer | 49 |
| Publikationsstatus | Veröffentlicht - 15 Dez. 2005 |
Abstract
Titanium dioxide (TiO2) is widely used for applications in heterogeneous photocatalysis. We prepared nanocrystalline powders of the anatase as well as the rutile modification by high-energy ball milling of the coarse grained source materials for up to 4 h. The resulting average grain size was about 20 nm, The morphology of the powders was investigated with transmission electron microscopy, X-ray powder diffraction, and BET surface area determination. Measurements of the catalytic activity reveal a maximum as a function of the milling time at about 40 min. This maximum could be explained by a superposition of two counteracting effects. The first one is the increase of the specific surface area resulting in an increase of the catalytic activity, and the second one is a change of the electronic structure at the surface of the TiO2 particles corresponding to a reduction of the surface. The latter one was confirmed by light absorption experiments, X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy.
ASJC Scopus Sachgebiete
- Chemie (insg.)
- Physikalische und Theoretische Chemie
- Werkstoffwissenschaften (insg.)
- Oberflächen, Beschichtungen und Folien
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
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in: Journal of Physical Chemistry B, Jahrgang 109, Nr. 49, 15.12.2005, S. 23274-23278.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Preparation by high-energy milling, characterization, and catalytic properties of nanocrystalline TiO2
AU - Indris, Sylvio
AU - Amade, Roger
AU - Heitjans, Paul
AU - Finger, Mina
AU - Haeger, Andreas
AU - Hesse, Diethard
AU - Grünert, Wolfgang
AU - Börger, Alexander
AU - Becker, Klaus Dieter
PY - 2005/12/15
Y1 - 2005/12/15
N2 - Titanium dioxide (TiO2) is widely used for applications in heterogeneous photocatalysis. We prepared nanocrystalline powders of the anatase as well as the rutile modification by high-energy ball milling of the coarse grained source materials for up to 4 h. The resulting average grain size was about 20 nm, The morphology of the powders was investigated with transmission electron microscopy, X-ray powder diffraction, and BET surface area determination. Measurements of the catalytic activity reveal a maximum as a function of the milling time at about 40 min. This maximum could be explained by a superposition of two counteracting effects. The first one is the increase of the specific surface area resulting in an increase of the catalytic activity, and the second one is a change of the electronic structure at the surface of the TiO2 particles corresponding to a reduction of the surface. The latter one was confirmed by light absorption experiments, X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy.
AB - Titanium dioxide (TiO2) is widely used for applications in heterogeneous photocatalysis. We prepared nanocrystalline powders of the anatase as well as the rutile modification by high-energy ball milling of the coarse grained source materials for up to 4 h. The resulting average grain size was about 20 nm, The morphology of the powders was investigated with transmission electron microscopy, X-ray powder diffraction, and BET surface area determination. Measurements of the catalytic activity reveal a maximum as a function of the milling time at about 40 min. This maximum could be explained by a superposition of two counteracting effects. The first one is the increase of the specific surface area resulting in an increase of the catalytic activity, and the second one is a change of the electronic structure at the surface of the TiO2 particles corresponding to a reduction of the surface. The latter one was confirmed by light absorption experiments, X-ray photoelectron spectroscopy, and electron paramagnetic resonance spectroscopy.
UR - http://www.scopus.com/inward/record.url?scp=30544450978&partnerID=8YFLogxK
U2 - 10.1021/jp054586t
DO - 10.1021/jp054586t
M3 - Article
AN - SCOPUS:30544450978
VL - 109
SP - 23274
EP - 23278
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 49
ER -