Preparation, Characterisation, and Photocatalytic Behaviour of Co-TiO₂ with Visible Light Response

Figure 1

(a) XPS spectra in the Co2p(3/2) binding energy region for Co(1%)-TiO₂ (curve a) and Co(2%)-TiO₂ (curve b); (b) ratio of XPS peaks intensity, I(Co2p)/I(Ti2p), as a function of the surface concentration of cobalt for Co(x%)-TiO₂ with (1) x = 0.2%; (2) x = 0.5%; (3) x = 1%; (4) x = 2%. Full circles are the experimental data and the dashed line refers to calculated values (see text). The final calcination temperature for all samples was 400^°C.

(a)

(b)