Heat Attachment Method for the Immobilization of TiO2 on Glass Plates: Application to Photodegradation of Basic Yellow Dye and Optimization of Operating Parameters, Using Response Surface Methodology

The UV/TiO 2 /H 2 O 2 degradation of Basic Yellow 28 dye (BY28) in aqueous solutions was investigated with immobilized P-25 TiO 2 powder on a glass plate by a heat attachment method. A central composite design (CCD) was employed for the screening of the significant parameters (flow rate, initial dye concentration, solution pH, and initial H 2 O 2 concentration) and to identify the most relevant interactions between the operating parameters. Results showed that solvent type and thickness of the coating are very effective on the photoactivity of immobilized TiO 2 . The model equation obtained led to a classification of the parameters based on their level of significance. In addition, a relevant interaction between the initial dye concentration and the initial H 2 O 2 concentration was highlighted. After performing a screening of the various operating parameters, response surface analysis led to the optimal conditions for the yield of BY28 degradation, resulting in 96% decolorization yield.