Preparation method for WO3-ZrO2 photocatalytic sewage treatment composite film

The invention relates to the field of sewage treatment, and specifically discloses a preparation method for a WO3-ZrO2 photocatalytic sewage treatment composite film. The photocatalytic sewage treatment composite film provided by the invention is formed by hot-pressing of a base film and a photocatalytic film. The preparation method for the photocatalytic film comprises the following steps: subjecting ammonium fluorozirconate and sodium tungstate to dissolving treatment so as to obtain a zirconium dioxide gel, dissolving the zirconium dioxide gel and raw materials in a propanol solution, evaporating a part of an obtained solution, adding carbon nanotubes, carrying out heating so as to form a slurry, coating a film onto a substrate with the slurry, and subjecting the film to heat treatmentunder a vacuum condition so as to obtain the photocatalytic sewage treatment composite film. The preparation method for the base film comprises the following steps: placing an AL2O3 film in a precursor solution of CdS, carryi