Effects of size and shell thickness of TiO2 hierarchical hollow spheres on photocatalytic behavior: An experimental and theoretical study

- Highly uniform hollow-spheres of TiO2 anatase with controllable diameter are synthesized through a self-sacrificing template method.
- The roughness of hollow spheres could be controlled by NaF concentration.
- Smaller hollow spheres have better photocatalytic than larger hollow spheres.
- Each single hollow-sphere has absorption power equivalent to a solid sphere as the shell thickness parameter reaches a critical value, 0.3-0.6.