CO 2 Reduction Performance with Double-Layered Cu/TiO 2 and P 4 O 10 /TiO 2 as Photocatalysts under Different Light Illumination Conditions.

This paper presents an experimental study of using a double-layered Cu/TiO₂ and P₄O₁₀/TiO₂ as photocatalysts for CO₂ reduction with an extended wavelength of range light from ultraviolet light (UV) to infrared light (IR). The lights studied were UV + visible light (VIS) + IR, VIS + IR and IR only. This study also investigated the impact of the molar ratio of CO₂:H₂O on the CO₂ reduction performance. This study revealed that the optimum molar ratio of CO₂:H₂O to produce CO was 1:1, irrespective of light illumination condition, which matched the theoretical molar ratio to produce CO according to the reaction scheme of CO₂ reduction with H₂O. Comparing the results of double-layered Cu/TiO₂ and P₄O₁₀/TiO₂ with those of double-layered TiO₂ obtained under the UV + VIS + IR light illumination condition, the highest concentration of formed CO and the molar quantity of formed CO per unit weight of the photocatalyst increased by 281 ppmV and 0.8 μmol/g, in the case of the molar ratio of CO₂:H₂O = 1:1. With IR-only illumination, the highest concentration of formed CO and the molar quantity of CO formed per unit weight of the photocatalyst was 251 ppmV and 4.7 μmol/g, respectively. [ABSTRACT FROM AUTHOR]