Figure 1: Scanning electron microscopy (SEM) images of TiO2 films surfaces containing fibers heat-treated at (a) 650 °C, (b) 700 °C (c) 750 °C and (d) 800 °C

Figure 2: Scanning electron microscopy (SEM) images of TiO2/WO3 films surfaces containing fibers heat-treated at (a) 650 °C, (b) 700 °C (c) 750 °C and (d) 800 °C

Figure 3: Images for transmision electron microscopy (TEM) of thin films of TiO2 treated in (a) 650 °C, (b) 700 °C (c) 750 °C and (d) 800 °C

Figure 4: Images for transmission electron microscopy (TEM) of thin films of bicomponent TiO2/WO3 calcined at (a) 650 °C, (b) 700 °C (c) 750 °C and (d) 800 °C

Figure 5: X-ray diffraction spectra of thin films WHT

Figure 6: X-ray diffraction spectra of TiO2 thin films heat treated at 650 ºC, 700 ºC, 750 ºC and 800 °C

Figure 7: X-ray diffraction spectra of TiO2/WO3 thin films heat treated at 650, 700, 750 and 800 °C

Figure 8: Relative concentration of methyl orange during the photocatalytic test in the presence of TiO2 thin films and TiO2-P25 standard

Figure 9: Relative concentration of methyl orange during the photocatalytic test in the presence of TiO2/WO3 thin films and TiO2-P25 standard