Abstract
By means of laser induced fluorescence (LIF) method, OH radicals formed and released from the surface of TiO2 photocatalysts were detected. The effect of heat treatments of TiO2 on the OH radical formation shows that the amount of OH radicals is affected by the states of surface hydroxyl groups but not the crystalline phase. The effects of the surface hydroxyl groups were discussed based on the measurements of the trapped holes with low temperature ESR spectroscopy and adsorbed water with proton NMR spectroscopy. Then, the reaction mechanism of OH radical formation on the TiO2 surface was suggested to be the reduction of adsorbed H2O2 which is accumulated on the surface by photo irradiation. Finally, the previously reported reaction mechanism of the acetic-acid decomposition was reconsidered based on the mechanism of OH radical formation.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Daimon H, Nosaka Y (2007) Formation and behavior of singlet molecular oxygen in TiO2 photocatalysis studied by detecting near-infrared phosphorescence. J Phys Chem C 111:4420–4424
Hirakawa T, Nosaka Y (2002) Properties of O −•2 and OH• formed in TiO2 aqueous suspensions by photocatalytic reaction and the influence of H2O2 and some ions. Langmuir 18:3247–3254
Hirakawa T, Nakaoka Y, Nishino J, Nosaka Y (1999) Primary passages for various TiO2 photocatalysts studied by means of luminol chemiluminescent probe. J Phys Chem B 103:4399–4403
Kubo W, Tatsuma T (2006) Mechanisms of photocatalytic remote oxidation. J Am Chem Soc 128:16034–16035
Kumar CP, Gopal NO, Wang TC, Wong MS, Ke SC (2006) EPR investigation of TiO2 nanoparticles with temperature-dependent properties. J Phys Chem B 110:5223–5229
Murakami Y, Kenji E, Nosaka AY, Nosaka Y (2006) Direct detection of OH radicals diffused to the gas phase from the UV-irradiated photocatalytic TiO2 surfaces by means of laser induced fluorescence spectroscopy. J Phys Chem B 110:16808–16811
Nakamura R, Nakato Y (2004) Primary intermediates of oxygen photoevolution reaction on TiO2 (Rutile) particles, revealed by in situ FTIR absorption and photoluminescence measurements. J Am Chem Soc 126:1290–1298
Nakaoka Y, Nosaka Y (1997) ESR investigation into the effects of heat treatment and crystal structure on radicals produced over irradiated TiO2 powder. J Photochem Photobiol A Chem 110:299–307
Nosaka Y (2002) Photoelectrochemical reactions at the semiconductor microparticles. In: Kaneko M, Ohkura I (eds) Photocatalysis. Kodansha Springer, Tokyo, pp 69–86
Nosaka AY, Nosaka Y (2005) Characteristics of water adsorbed on TiO2 photocatalytic surfaces as studied by 1H-NMR spectroscopy. Bull Chem Soc Jpn 78:1595–1607
Nosaka Y, Yamashita Y, Fukuyama H (1997) Application of chemiluminescent probe to monitoring superoxide radicals and hydrogen peroxide in TiO2 photocatalysis. J Phys Chem B 101:5822–5827
Nosaka Y, Kishimoto M, Nishino J (1998) Factors governing the initial process of TiO2 photocatalysis studied by means of in-situ electron spin resonance measurements. J Phys Chem B 102:10279–10283
Nosaka Y, Nakamura M, Hirakawa T (2002) Behavior of superoxide radicals formed on TiO2 powder photocatalysts studied by a chemiluminescent probe method. Phys Chem Chem Phys 4:1088–1092
Nosaka Y, Komori S, Yawata K, Hirakawa T, Nosaka AY (2003) Photocatalytic OH radical formation in TiO2 aqueous suspension studied by several detection methods. Phys Chem Chem Phys 5:4731–4735
Nosaka AY, Fujiwara T, Yagi H, Akutsu H, Nosaka Y (2004) Characteristics of water adsorbed on TiO2 photocatalytic systems on temperature increase as studied by solid-state 1H-NMR spectroscopy. J Phys Chem B 108:9121–9125
Nosaka AY, Nishino J, Fujiwara T, Ikegami T, Yagi H, Akutsu H, Nosaka Y (2006a) Effects of thermal treatments on the recovery of adsorbed water and photocatalytic activities of TiO2 photocatalytic systems. J Phys Chem B 110:8380–8385
Nosaka Y, Natsui H, Sasagawa M, Nosaka AY (2006b) ESR studies on the oxidation mechanism of sterically hindered cyclic amines in TiO2 photocatalytic systems. J Phys Chem B 110:12993–12999
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Springer Science+Business Media LLC
About this chapter
Cite this chapter
Nosaka, Y. (2010). Surface Chemistry of TiO2 Photocatalysis and LIF Detection of OH Radicals. In: Anpo, M., Kamat, P. (eds) Environmentally Benign Photocatalysts. Nanostructure Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-0-387-48444-0_8
Download citation
DOI: https://doi.org/10.1007/978-0-387-48444-0_8
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-0-387-48441-9
Online ISBN: 978-0-387-48444-0
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)