Table 1: Physical and chemical characteristics of the investigated semiconductor oxides.

Sample (m2·g−1) , (cm3·g−1) , (eV)L a, (nm)

-Fe2O325,70,182,02000
WO3500,0052,5520
ZnO41d3,233000
TiO245,30,13,435–7
TiO2 P25b520,183,2328

: specific surface area data obtained from the BET-model.
: micropore volume data calculated by deBoer’s t-plot method.
: energy band gap.
L: linear particle size.
—: not determined.
Published data.