Photodegradative properties of TiO2 films prepared by MOCVD

TiO2 is a well-known photocatalist for the air-oxydation of organic compoun ds. This paper deals with the preparation of TiO2 layers by MOCVD. The phot odegradation rate has been studied in the presence of aqueous suspensions ( methylene blue) as a function of the film thickness, roughness and crystall ite preferred orientation. These results are compared with aqueous suspensi ons of Degussa P-25 powders. Deposits obtained on fused quartz showed a hig her photodegradation rate than those prepared on glass, while Degussa powde rs exhibited an intermediate value.