Ordered macroporous Bi2O3/TiO2 film coated on a rotating disk was prepared by sol-gel method in the presence of polystyrene (PS) microspheres as a template, which showed spectral response in visible region via Bi2O3 photosensitizing effect and low photoelectron-hole recombination by forming Bi2O3-TiO2 heterojunctions. Meanwhile, the ordered macropores in the Bi2O3/TiO2 film promoted light-harvesting via multiple reflections and also facilitated reactant adsorption owing to the diminished diffusion limit and enhanced surface hydrophilicity. More importantly, the rotating disk could effectively reduce the light shielding on the Bi2O3/TiO2 film photocatalyst, especially in the color solution. As a result, the as-prepared Bi2O3/TiO2 film exhibited high activity in aqueous visible-light-driven photocatalytic degradation of single and mixed dyes or reduction of Cr6+ to Cr3+.
- Cr reduction
- Mixed-dyes degradation
- Ordered macroporous BiO/TiO film
- Photocatalytic rotating-disk reactor
- Visible-light-induced photocatalysis