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

Highlights: [•] 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. [Copyright &y& Elsevier]