We prepared titanium dioxide (TiO 2 ) photocatalysts sensitive to visible light, namely copper(II) [Cu(II)]-grafted tungsten and gallium co-doped TiO 2 (Ti 1¹3x W x Ga 2x O 2 , x value is up to 0.12), based on the concept of narrowing the band gap of TiO 2 by positively shifting its conduction band (CB) edge to a lower energy level and the catalytic multi-electron reduction of oxygen by Cu(I) ions [H. Yu, H. Irie, K. Hashimoto, J. Am. Chem. Soc., 132, 6898 (2010)]. Using this approach, the optical band-gap energy of TiO 2 was decreased to ³2.8 eV, and band-gap narrowing was confirmed by measuring the action spectrum for oxygen evolution from water in the presence of iron ions [Fe(III), from FeCl 3 ]. The Cu(II)-grafted Ti 1¹3x W x Ga 2x O 2 (x = 0.12) photocatalyst effectively decomposed 2-propanol to carbon dioxide (CO 2 ) via acetone under visible light (400530 nm, 1 mW/cm 2 ) with a CO 2 -generation rate of 0.30¯mol/h. Grafting Cu(II) ions after the hydrochloric acid treatment of Ti 1¹3x W x Ga 2x O 2 (x = 0.12) increased the CO 2 -generation rate to 0.40¯mol/h.
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