TiO_2 and WO_3/TiO_2 thin films for photocatalytic wastewater treatment

摘要

Tungsten trioxide (WO_(3)) influence as a doping agent was studied in order to improve Titanium dioxide (TiO_(2)) photocatalytic efficiency under sunlight. Hydrolysis at low temperature, followed by dialysis and chemical reactive sputtering, has been applied to synthesise thin films. Morphological investigations were performed by X-ray diffraction (DRX) and atomic force microscopy (AFM). Gap energies were determined from transmission spectra (TS), a solar photocatalytic reactor was used to study photodegradation efficiency. The adhesion strength was performed by scratch test. Doping TiO_(2)by WO_(3)decreases the energy gap of the film; consequently an increase of photocatalytic activity under solar radiation is achieved. The degradation test under sunlight showed an efficiency of 10.37 mg m~(‒2)h~(‒1)in the case of the non-doped film. However, the 5 wt% WO_(3)doped film had a degradation efficiency of 17.87 mg m~(‒2)h~(‒1). The scratch test performed to the 5 wt% WO_(3)doped film has determined a critical load value of 2.6 N.