273
Fig. 13.6 (a) FESEM images of the TiO 2 nanowire membrane [354]; (b) SEM images of TiO 2
nanotube layer formed in free-standing membrane [4]
different mechanisms to enhance the photoactivity of the catalysts. The presence of
electron acceptors could scavenge the excited electrons and altogether prevent the
recombination of electron/hole pairs. Recent studies have shown that modified TiO 2
catalysts have an enhanced photoactivity under solar irradiation [138, 177, 287].
CNTs coupling with TiO 2 have shown potential prolongation of electron/hole pairs
by capturing the electron within their structure. As for dye-sensitized coupling, the
excited dye molecules under solar illumination can provide additional electrons to
Recent Developments in Photocatalytic Water Treatment Technology
Fig. 13.6 (a) FESEM images of the TiO 2 nanowire membrane [354]; (b) SEM images of TiO 2
nanotube layer formed in free-standing membrane [4]
different mechanisms to enhance the photoactivity of the catalysts. The presence of
electron acceptors could scavenge the excited electrons and altogether prevent the
recombination of electron/hole pairs. Recent studies have shown that modified TiO 2
catalysts have an enhanced photoactivity under solar irradiation [138, 177, 287].
CNTs coupling with TiO 2 have shown potential prolongation of electron/hole pairs
by capturing the electron within their structure. As for dye-sensitized coupling, the
excited dye molecules under solar illumination can provide additional electrons to
Recent Developments in Photocatalytic Water Treatment Technology