Characterization and Photocatalytic Activity of Enhanced Copper-Silica-Loaded Titania Prepared via Hydrothermal Method

Figure 5

TEM images of TiO₂-25% SiO₂ oxide powder prepared at various pH values: (a) pH 3, (b) pH 7, (c) pH 12, and (d) pH 14.

(a)

(b)

(c)

(d)