Sol–gel synthesis of titania hollow spheres

TiO2 hollow spheres are prepared by a convenient sol–gel method at room temperature. The products were characterized by XRD, FESEM, TEM and FT-IR. It was found that these spheres are hollow inside with outer diameters of 200–500 nm. The average mesoporous diameter is about 9.8 nm. And the BET surface area and specific pore volume are about 161.9 m2/g and 0.441 cm3/g, respectively.