Particle coating of talc with TiO_2: synthesis, characterization and photo catalytic degradation of methylene blue

摘要

Talc was used as support for synthesis of TiO_2-based photocatalyst with varying TiO_2 loading. A simple sol-gel method was used to impregnate titanium sol into the interlayers of talc with high speed stirring, followed by calcination at different temperature. The XRD analysis and SEM observation indicated that the anatase phases of TiO_2 were synthesized and individually distributed on the surface of the talc particles. The wettability of talc was improved by TiO_2 particle coating. The efficiency of the TiO_2-talc composites to remove methylene blue from its aqueous solution was evaluated under UV irradiation. Different sintering temperature influenced the catalytic activity, TiO_2-talc composites enhanced dye degradation in contrast with physical adsorption of Talc or photo-catalytic of pure TiO_2.