Abstract
Photocatalyst has recently been investigated miscellaneously in association with environmental concerns. TiO2 has especially been subject for a wide range of researches, because of its stability and harmlessness to environm studies have been made to improve photocatalytic activity by formation of TiO2 with improved crystallinity, TiO2 with carrier metal and TiO2 with a wider surface area. The purpose of this study is to improve photocatalytic activity with increasing of surface area and providing carrier metal, where aluminum was used for base of TiO2 film. TiO2 film was prepared on porous aluminum anodic oxidation film having a wide surface area. TiO2 film was prepared also on electrolytically colored anodic oxide coatings of nickel and silver. Photocatalytic activities were examined by decomposition rate of malachite green. It was found that, the base of Na3PO4 anodizing films shows higher photocatalytic activity than that of H2SO4 anodizing films, due to a larger amount of TiO2. The best photocatalytic activity took place on both films when the film thickness was 4μm. Photocatalytic activity of TiO2 films on electrolytically colored anodic oxide coatings on nickel and silver were improved since deposit by secondary electrolysis acts as carrier metal. It was indicaed from the above result, that electorolytically colored anodic oxide coatings are effective as base of photocatalyst films, and higher photocatalytic activity will be expected by carrying out electrolytic bath of anodic oxidation film, adequately selecting of deposit metal and controlling the amount of deposit metal.
