Abstract
In this study, both TiO2 and WO3 were synthetized using controlled hydrolysis followed by dialysis. The produced transparent emulsions were dried into powders. Then, TiO2–WO3 photocatalyst films were deposited by pulsed electrophoretic deposition. The substrates were made of stainless steel pre-functionalized in a conversion bath. The conversion layer played an important role in the adhesion of the composite film into the substrate. Film surface morphology, crystallinity, roughness, thickness, and elemental composition were determined from XRD, optical profilometry and SEM–EDX measurements. The mechanical properties were resolute by nano-indentation test and adhesion was investigated using a scratch test. The photocatalytic decolorization of the Amido Black-10B dye was studied over TiO2–WO3 coatings under UV irradiation. TiO2 film doped 5% WO3 film exhibited the best photocatalytic activity due to its crystalline size and three-phase structure as well as a synergetic effect of TiO2–Fe2O3 and TiO2–WO3. This film showed also good adhesion properties.
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