Publications Repository - Gdańsk University of Technology

Series ofWO3/TiO2 nanocompositeswere obtained by hydrothermal method followed by calcination in the temperature range from 400∘C to 900∘C. The characteristics of photocatalysts by X-ray diffractometry (XRD), scanning electron microscope (SEM), and diffuse reflectance spectroscopy (DRS) showed that increasing the calcination temperature from 400 to 900∘C resulted in change of photocatalytic activity under UV-Vis light.Moreover, the amount ofWO3 crystalline phase and amorphous phase inWO3/TiO2 aggregates, as revealed by XRD analysis, was dependent on the calcination temperature.TheWO3/TiO2 samples with 8 mol% load ofWO3 in respect to TiO2 calcinated at 500 and 800∘C possess the highest photocatalytic activity in reaction of phenol degradation, which is about 1.2 and 1.5 times that with calcination at 400∘C. The increase in calcination temperature above 400∘C resulted in increase of WO3 crystallinity and reduction of the amount of amorphous phase in the nanocomposite structure. Moreover, the annealing of nanocomposites above 700∘C decreases the value of optical band gap energies of obtainedWO3/TiO2 nanomaterials.

Authors

• dr inż. Joanna Mioduska link open in new tab ,
• prof. dr hab. inż. Anna Zielińska-Jurek link open in new tab ,
• dr inż. Marcin Janczarek link open in new tab ,
• prof. dr hab. inż. Jan Hupka link open in new tab