Persistent fluorescence-assisted TiO₂-xNy-based photocatalyst for gaseous acetaldehyde degradation.
Photocatalytic technologies were utilized to develop an environment-friendly system that is capable of removing and oxidizing organic pollutants from an air stream. A series of long-afterglow phosphors emitting long lifetime fluorescence was adapted to prepared TiO(2)-based composite photocatalysts for the photodegradation of gas-phase acetaldehyde. Although the photocatalytic reaction by an undoped titania (Degussa P25) was stopped immediately after turning off the irradiation light, the long-afterglow phosphor/nitorogen-doped TiO(2) (TiO(2-x)N(y)) composites maintained the acetaldehyde photodegradation ability even after turning off the light for a long time. This novel photocatalytic property may be attributed to the presence of the long-afterglow phosphor, which can reserve the light energy and generate the persistent fluorescence afterward as the light source for the photocatalytic reaction with the visible-light responsive TiO(2-x)N(y). The substitution of the undoped TiO(2) with TiO(2-x)N(y) was essential to use the fluorescence as a light source for photocatalysis. Such a self-fluorescence-assisted system could enhance the performance of photocatalysts for environmental cleanup.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. lihuihui@mail.tagen.tohoku.ac.jp
Huihui
H
Li
Shu
S
Yin
Yuhua
Y
Wang
Tsugio
T
Sato
D000079:Acetaldehyde / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D002384:Catalysis / Q000528:radiation effects; D005740:Gases / Q000737:chemistry*; D008027:Light; D010782:Photolysis / Q000528:radiation effects*; D013050:Spectrometry, Fluorescence; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*
D005740:Gases; D002245:Carbon Dioxide; C009495:titanium dioxide; D014025:Titanium; D000079:Acetaldehyde