Abstract
Tungsten trioxide (WO3) deposited with platinum species as co-catalyst (Pt-WO3) successfully demonstrated visible-light sensitive photocatalytic system for the decomposition of such volatile organic compounds (VOC) as toluene. Mechanistic insight for electron transfer from the Pt-WO3 to O2 was clarified by investigating photo-electrochemical charge-discharge properties. Moreover, it was observed that the photocatalytic activity of Pt-WO3 was significantly improved by simple physical mixing with TiO2. An improvement for the photocatalytic activity is attributed to the formation of Ti-peroxide species through a mass-transfer of hydrogen peroxide from Pt-WO3 to TiO2, which leads to complete decomposition of VOC into CO2 under visible-light irradiation.
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