Visible-Light Photodegradation of Dye on Co-Doped Titania Nanotubes Prepared by Hydrothermal Synthesis

Figure 2

Adsorption (solid symbol)/desorption (empty symbol) isotherms of N₂ onto titania nanotubes at −196°C: (a) Co-1-TNT; (b) Co-3-TNT; (c) Co-5-TNT; (d) Co-7-TNT.

(a)

(b)

(c)

(d)