TY - JOUR
T1 - Chemical structure of photocatalytic active sites in nanosize TiO2
AU - Hsiung, Tung Li
AU - Paul Wang, H.
AU - Lin, Hong Ping
N1 - Funding Information:
The financial support of the National Science Council, Taiwan, is gratefully acknowledged. We also thank Prof. Y.W. Yang and Dr. Jyh-Fu Lee of the NSRRC for their assistances of X-ray absorption spectroscopic experiments.
PY - 2008/2
Y1 - 2008/2
N2 - Nanosize TiO2 has been widely used in photocatalysis. However, works on speciation of photocatalytic active sites in nanosize TiO2 is still lacking in the literature. Hence, the main objective of this work was to study chemical structure of photoactive species in the nanosize TiO2 (synthesized by sol-gel method) by X-ray absorption near edge structural (XANES) spectroscopy. The refined pre-edge XANES spectra show that photocatalytic active species such as A1 (4969.4 eV), A2 (4970.5 eV) and A3 (4972.3 eV) in the TiO2 photocatalysts can be attributed to 1s-3d transitions for four- (TiO4), five- ((Ti{double bond, long}O)O4), and six- (TiO6) coordinated Ti structural species, respectively. The A2 species on the surfaces of the nanosize TiO2 was found to be the main active sites during photocatalytic degradation of methylene blue.
AB - Nanosize TiO2 has been widely used in photocatalysis. However, works on speciation of photocatalytic active sites in nanosize TiO2 is still lacking in the literature. Hence, the main objective of this work was to study chemical structure of photoactive species in the nanosize TiO2 (synthesized by sol-gel method) by X-ray absorption near edge structural (XANES) spectroscopy. The refined pre-edge XANES spectra show that photocatalytic active species such as A1 (4969.4 eV), A2 (4970.5 eV) and A3 (4972.3 eV) in the TiO2 photocatalysts can be attributed to 1s-3d transitions for four- (TiO4), five- ((Ti{double bond, long}O)O4), and six- (TiO6) coordinated Ti structural species, respectively. The A2 species on the surfaces of the nanosize TiO2 was found to be the main active sites during photocatalytic degradation of methylene blue.
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U2 - 10.1016/j.jpcs.2007.07.009
DO - 10.1016/j.jpcs.2007.07.009
M3 - Article
AN - SCOPUS:38749128349
VL - 69
SP - 383
EP - 385
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 2-3
ER -