Chemical structure of photocatalytic active sites in nanosize TiO2

Tung Li Hsiung; H. Paul Wang; Hong Ping Lin

doi:10.1016/j.jpcs.2007.07.009

Chemical structure of photocatalytic active sites in nanosize TiO₂

Tung Li Hsiung, H. Paul Wang, Hong Ping Lin

Research output: Contribution to journal › Article

27 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	383-385
Number of pages	3
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	2-3
DOIs	https://doi.org/10.1016/j.jpcs.2007.07.009
Publication status	Published - 2008 Feb 1

All Science Journal Classification (ASJC) codes

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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Hsiung, T. L., Paul Wang, H., & Lin, H. P. (2008). Chemical structure of photocatalytic active sites in nanosize TiO₂. Journal of Physics and Chemistry of Solids, 69(2-3), 383-385. https://doi.org/10.1016/j.jpcs.2007.07.009

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abstract = "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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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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