Facile template-free route to synthesis visible light respensive hollow TiO_2 spheres

摘要

The monodisperse hollow TiO2 spheres (HTS) were fabricated by facile template-free route involving direct precipitation and etching reaction. Tetrabutyl titanate was used as titanium precursor to form amorphous TiO2 spheres (ATS) directly in ethanol-acetonitrile mixed solution. Then, the ATS were etched by F- with the protection of PVP to form HTS under hydrothermal reaction conditions. The physical and chemical characterizations of synthesized samples were conducted by SEM, TEM, XRD and UV-vis diffuse reflectance spectroscopy. Result showed that morphology and structure of HTS can be easily controlled by adjusting time of etching reaction. The HTS obtained by etching for 4 h exhibited good hollow structure with unique shell assembled with enriched nanothorns, and it possessed good photocatalytic activity under visible light irradiation. (C) 2019 Elsevier B.V. All rights reserved.