J. Phys. Chem. B, 101(30) [5822-5827](1997)

Application of Chemiluminescent Probe to Monitoring Superoxide Radicals and Hydrogen Peroxide in TiO2 Photocatalysis

Nosaka, Y., Yamashita, Y, and Fukuyama, H:

(Abstract)
A chemiluminescent probe, luminol, was successfully applied to monitoring superoxide ions (O₂^-.) and hydrogenperoxide (H₂O₂) produced on photocatalytic reaction in aqueous TiO₂ suspension. Two chemiluminescent reactions were distinguished from the decay profile after the end of the irradiation and the reaction mechanism was analyzed. Fast decay component gives an information of O₂^-. and the slow one provides the amount of H₂O₂. Rate constant for the reaction of O₂^-. with luminol was obtained to be 1x10⁴ M^-1s^-1. The amount of O₂^-. during the irradiation on TiO₂ in alkaline solution could be estimated to be the order of 10^-13 M. Detection of H₂O₂ as small as 10^-9 M was demonstrated in the photocatalytic water oxidation.


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