In situ IR study of surface hydroxyl species of dehydrated TiO 2: Towards understanding pivotal surface processes of TiO 2 photocatalytic oxidation of toluene

Huaxiang Lin, Jinlin Long, Quan Gu, Wenxin Zhang, Rusheng Ruan, Zhaohui Li, Xuxu Wang

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66 Scopus citations

Abstract

The surface species on P25-TiO 2 were characterized by FTIR after evacuation at 50-550 °C. The functions of OH groups on P25-TiO 2 catalysts have been tested by the adsorption and photooxidation of toluene in an in situ IR cell. FTIR studies show that the hydroxyl species on P25-TiO 2 are clearly temperature-dependent and P25-TiO 2 has six isolated hydroxyls with bands at 3734, 3715, 3688, 3671, 3658 and 3640 cm -1. The OH groups on P25 play different roles in the photo-oxidation process: surface hydroxyls with bands at 3688, 3671, 3658 and 3640 cm -1 act as adsorption sites while surface hydroxyls with bands at 3734 and 3715 cm -1 act as sources of the OH radical.

Original languageEnglish (US)
Pages (from-to)9468-9474
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number26
DOIs
StatePublished - Jul 14 2012

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