Study on preparation and photocatalytic properties of WOx-TiO2/Ti composite ceramic membrane

WOx-TiO2 /Ti ceramic membrane was fabricated on Ti substrate surface by anodic oxidation method through adding Na2WO4 to H2SO4 electrdyte solution. The film were characterized by SEM, EDS, XRD, and the photocatalytic properties was also investigated. The surface of the films more coarse and porous. The films were composed of rutile TiO2 and anatase TiO2. Meantime, W in the catalyst film existed in the form of WO3, WO2, W3O8 and W18O49, respectively. The experiments demonstrated that the humic was successfully photodegraded under visible light irradiation. It was found that an optimal Na2WO4 concentration of 1 mmol/L, photocatalytic degradation rate of humic by compound WOx-TiO2/Ti ceramic membrane in visible light in 120 min achieved 82.8%, which was 27.8% higher than pure TiO2/Ti film.