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Photocatalytic oxidation by semiconductors is a dominant way to eliminate toxic organic pollutants. Different from thermal-activated catalysis, it is generally considered that the rate of charge carrier transfer from semiconductors to reactants determined photocatalytic activity. However, how charge carrier transfer correlates with photocatalytic activity is not well known, especially in gaseous photocatalytic oxidations of organics. By means of photoconductances, the present research gains some novel insight into the electron transfer in the acetone photocatalysis over TiO2. Because it is shown that the electron transfer from TiO2 to O2 is faster than the acetone conversion, our results point toward a fact that the electron transfer also contributes to the recombination via the O2 sorption cycling in addition to the photocatalytic effect. The role of Au for a cocatalyst was also investigated in the acetone photocatalysis. It is found that the decoration of TiO2 with Au nanoparticles indeed leads to an in...

the journal of physical chemistry c

New Insight into the Role of Electron Transfer to O<sub>2</sub> in Photocatalytic Oxidations of Acetone over TiO<sub>2</sub> and the Effect of Au Cocatalyst

New Insight into the Role of Electron Transfer to O2 in Photocatalytic Oxidations of Acetone over TiO2 and the Effect of Au Cocatalyst

New Insight into the Role of Electron Transfer to O₂ in Photocatalytic Oxidations of Acetone over TiO₂ and the Effect of Au Cocatalyst