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Formation of singlet molecular oxygen associated with the formation of superoxide radicals in aqueous suspensions of TiO2 photocatalysts by Toshihiro Daimon; Tsutomu Hirakawa; Masahiro Kitazawa; Junya Suetake; Yoshio Nosaka is a Materials Science article available to read on EtoBox.
What is Formation of singlet molecular oxygen associated with the formation of superoxide radicals in aqueous suspensions of TiO2 photocatalysts about?
The production and decay of singlet molecular oxygen ( 1 O 2 ) in TiO 2 photocatalysis were investigated by monitoring its phosphorescence under various reaction conditions. First, the effects of additives such as KBr, KSCN, KI, H 2 O 2 , and ethanol on the amount of 1 O 2 produced by photo excitation of P25 TiO 2 were measured. The same additives were employed to investigate the effect on the amount of O 2 À produced. Comparison between the effects on 1 O 2 and O 2 À suggested that 1 O 2 is formed by the electron transfer mechanism, the reduction of molecular oxygens to O 2 À by photogenerated electrons and the subsequent oxidation of O 2 À to 1 O 2 by photogenerated holes. The formation of 1 O 2 decreased at pH 11, indicating that the intermediate O 2 À is stabilized at the terminal OH site of the TiO 2 surface in the pH range of 5 < pH < 11. Eighteen commercially available TiO 2 photocatalysts were compared on the formation of 1 O 2 and O 2 À in an aqueous suspension system. The formation of 1 O 2 was increased with decreasing size of TiO 2 particles, indicating that a large specific surface area causes a higher possibility of reduction producing O 2 À and then a large amount
Who reads Formation of singlet molecular oxygen associated with the formation of superoxide radicals in aqueous suspensions of TiO2 photocatalysts?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Toshihiro Daimon; Tsutomu Hirakawa; Masahiro Kitazawa; Junya Suetake; Yoshio Nosaka
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-860X)
- Published
- 2008
- Language
- EN
- Field
- Materials Science (Physical Sciences)