XANES studies of photocatalytic active species in nano TiO2-SiO2

Tung Li Hsiung, H. Paul Wang, H. C. Wang

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17 Citations (Scopus)


Combined post-edge XANES (X-ray absorption near-edge structural) and 29Si magic angle spinning solid-state nuclear magnetic resonance (MAS SSNMR) observations show that Ti was dispersed in the frameworks of nano SiO2 (synthesized with the sol-gel method). In addition, the nano TiO2-SiO2 photocatalyst have features such as A1 (4969 eV), A2 (4970.5 eV) and A3 (4972 eV) that can be attributed to 1s-to-3d transitions for four- (TiO4), five- ((Ti=O)O4), and six- (TiO6) coordinated Ti species, respectively. The A2 ((Ti=O)O4) in TiO2-SiO2 may be the main active species, for instance, in the photocatalytic decomposition of trace 2-chlorophenol in H2O. This work exemplifies the utilization of XANES to reveal the active species in nano photocatalysts in detail.

Original languageEnglish
Pages (from-to)2042-2045
Number of pages4
JournalRadiation Physics and Chemistry
Issue number11 SPEC. ISS.
Publication statusPublished - 2006 Nov

All Science Journal Classification (ASJC) codes

  • Radiation


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