Abstract

Titanium-silicon (Ti/Si) binary oxides prepared by the sol-gel method with different Ti contents exhibit high photocatalytic reactivity for the reduction of CO2 with H2O to form CH4 and CH3OH. A dramatic enhancement in the photocatalytic reactivity was found in regions of lower Ti content. In situ spectroscopic investigations of these Ti/Si binary oxides indicate that the titanium oxide species are highly dispersed in the SiO2 matrices and exist in tetrahedral coordination. The good parallel relationship between the yield of the photoluminescence and the specific photocatalytic reactivity of the oxides as a function of the Ti content clearly indicates that the high photocatalytic reactivity of the oxides having a low Ti content is associated with the high reactivity of the charge transfer excited state of the titanium oxide species in tetrahedral coordination.

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