920483.fig.003a
(a)
920483.fig.003b
(b)
920483.fig.003c
(c)
920483.fig.003d
(d)
Figure 3: (a) Nitrogen adsorption-desorption isotherms, (b) BJH pore size distributions, (c) ammonia temperature-programmed desorption (NH3-TPD), and (d) carbon dioxide temperature-programmed desorption (CO2-TPD) for pristine (TNT10) and ion-exchanged (TNT0) titanate nanotubes.