Comparative study of photocatalytic performance of titanium oxide spheres assembled by nanorods, nanoplates and nanosheets

TiO₂ spheres assembled by nanorods, nanoplates and nanosheets were fabricated by facile hydrothermal/solvothermal methods. The three samples were thoroughly characterised by scanning electron microscopy, X-ray diffraction, the Brunauer-Emmett-Teller method and UV spectroscopy. The surface area of spheres assembled by nanosheets was 83.9 m²g^-1, which is larger than that obtained for nanorods (10.8 m²g^-1) and nanoplates (6.31 m²g^-1). Their photocatalytic performance was evaluated in terms of the decomposition rate of methyl orange in these three samples under UV irradiation. The best photoactivity was observed in the samples constructed from nanosheets.