Photoreduction of Cr(VI) Ions in Aqueous Solutions by UV/TiO₂ Photocatalytic Processes

Figure 10

X-ray diffraction patterns of catalysts: (a) TiO₂ (P25), (b) 5% Ag/TiO₂, and (c) 5% Cu/TiO₂.

(a)

(b)

(c)