An approach to elucidating photocatalytic reaction mechanisms by monitoring dissolved oxygen: Effect of H2O2 on photocatalysis

作者：Hirakawa Tsutomu^*; Koga Chifumi; Negishi Nobuaki; Takeuchi Koji; Matsuzawa Sadao

来源：Applied Catalysis B: Environmental , 2009, 87(1-2): 46-55.

DOI：10.1016/j.apcatb.2008.08.027

• Photocatalyst
• Ethanol
• Oxygen
• Hydrogen peroxide

We present a method to analyze the photocatalytic oxidation of ethanol (EtOH) in an aqueous TiO2 suspension by measuring the consumption of dissolved oxygen (DO) as a function of varying EtOH and H2O2 concentrations in the suspension. The consumption of DO was analyzed by means of Langmuir-Hinshelwood (L-H) kinetics. The parameter KD-DO calculated from L-H kinetics, defined as (O-2 consumption rate constant) (O-2 reproduction rate constant)(-1), reflects the adsorption equilibrium of EtOH and the photocatalytic reaction mechanisms. The observed KD-DO values for the photocatalytic oxidation of EtOH reflected to the proposed reaction mechanism measured by HPLC and starch-Iodine methods. By using this DO analysis method, we elucidated the photocatalytic reaction mechanism of EtOH oxidation and discussed the effect of H2O2 as active oxygen species on TiO2 photocatalysis.

• 出版日期2009-3-16