Abstract
Superoxide ions (O₂^.-) and hydrogen peroxide (H₂O₂) produced by visible light irradiation were analyzed to investigate the photocatalytic reaction mechanism for commercially available nitrogen- and sulfur-doped TiO₂ (BAPW25 and SJC). O₂^.- was detected by the chemiluminescence (CL) probe method with luminol, while the amount of H₂O₂ was measured as the CL intensity by the reaction with the luminol oxidized upon the addition of hemoglobin. By irradiation with 442-nm light, the S-doped TiO₂ surpassed the N-doped TiO₂ in the ability to produce O₂^.-, while the N-doped TiO₂ surpassed the S-doped TiO₂ in accumulating H₂O₂. The difference in the photocatalytic processes was attributed to the multivalence property of sulfur atoms which may promote the decomposition of H₂O₂.

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