Abstract
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.
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