Improvement in photocatalytic activity of TiO2 under visible irradiation through addition of N-TiO2.
This work is focused on improvement in photocatalytic activity of anatase-TiO2 (a-TiO2) photocatalyst under visible-light irradiation by adding nitrogen-doped TiO2 (N-TiO2) for depression of recombination rate between photoexcited electron and hole. The composites (a-TiO2/N-TiO2) were prepared by grinding in ethanol solvent at 200 rpm for 15 min with change in weight ratio of N-TiO2. In addition to the characterizations by X-ray diffraction and X-ray photoelectron spectroscopy, measurements of existing singlet oxygen by chemiluminescens method and photocatalytic activity by using NO(x) decomposition were conducted. The increases in singlet oxygen and photocatalytic activity have been observed and the phenomena are discussed based on the efficient prevention of recombination between photoexcited electron and hole within the prepared composite.
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan. kic22@andy.tagen.tohoku.ac.jp
In-Cheol
IC
Kang
Qiwu
Q
Zhang
Shu
S
Yin
Tsugio
T
Sato
Fumio
F
Saito
D002384:Catalysis; D008027:Light; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*
C009495:titanium dioxide; D014025:Titanium