1995 Volume 21 Issue 6 Pages 1075-1081
Amorphous titania, obtained by hydrolysis and polymerization reactions of titanium tetra iso-propoxide, was dissolved in 31 % hydrogen peroxide solution to form a transparent gel. The gel was peptized by further addition of hydrogen peroxide solution, and then the transparent coating solution was obtained. Glass and stainless steel plates were dip-coated by this coating solution, dried in a clean bench, and calcined at 373-773 K for glass and at 373-973 K for stainless steel.
The thin films calcined at 573-773 K were identified to be anatase by XRD and IR spectroscopies. The film calcined at 773 K was stable in 10 N hydrochloric and sulfuric acid solutions for one week. Photocatalytic activity was also tested with this film coated on glass plate. Dinitrophenol contained in a test solution was degraded under the irradiation from a sterilization Hg lamp.