Construction of hollow waxberry-like rutile-/anatase-TiO2/SnO2 towards enhanced photocatalysis

Hollow waxberry-like rutile- and anatase-TiO 2 /SnO 2 (TiO 2 @SnO 2 ) hierarchical architecture was fabricated for efficient photocatalysis . A Topotactic synthetic method, including the synthesis of CaTiO 3 /CaSnO 3 precursors and subsequent transformation into TiO 2 @SnO 2 , was used. Rutile TiO 2 nanorods nearly radial alignment grow on the external surface of the hollow sphere composed of anatase TiO 2 and SnO 2 nanoparticles . Because the hollow hierarchical structure enhances light harvesting ability and the tightly connected interface among different components improves the electron transfer efficiently, a waxberry-like TiO 2 @SnO 2 -5% sample with appropriate phase composition exhibits excellent photocatalytic performance. The sample behaved superior cycle stability.