Surface scattering and reflecting: the effect on light absorption or photocatalytic activity of TiO2 scattering microspheres

Abstract

In this article, nanoplate-assembled flower-like TiO₂ scattering microspheres were prepared via a microwave solvothermal process. X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N₂ adsorption–desorption isotherms and UV-Vis spectroscopy were used to characterize the as-prepared TiO₂ scattering microspheres. The results indicate that the scattering microspheres exhibit extremely high photocatalytic activity due to their unique structural and optical properties. Since the nanoplates are assembled on the surface of the microspheres, when the incident light irradiates the scattering surface, the light will be scattered. The scattered light has a longer optical path and thus is more easily absorbed. In addition, the doped F atoms lead to an enhancement of the surface acidity, thus increasing the adsorption of the reactant and improving visible light adsorption, thereby enhancing the number of photons available to take part in the photocatalytic reaction.