Abstract:Using composite surfactant template (CTAB/P-123) as structure directing agent, the precursor of mesoporous titania with anatase phase was prepared via supra-molecular self-assembly route from industrial TiOSO4 solution under thermal hydrolysis condition. The influence of different template removal methods on the mesoporous structure was investigated, such as ozone oxidation, organic extraction, calcination and their combination. The obtained mesoporous titania was characterized by chemical analysis, X-ray diffractometry, Fourier transform infrared, thermal gravity analysis, scanning electron microscopy and Brunauer-Emmett-Teller analysis technology. The results show that the as-synthesized mesoporous precursor has anatase phase under hydrothermal treatment. After combining template removal treatment, i.e. ozone oxidation to decompose the templates first, step-by-step extraction second, and multi-step calcination last, TiO2 content of the mesoporous product is 92.1% (mass fraction), with specific surface area of 133 m2/g and average aperture of 4.65 nm.

Key words: mesoporous titania; industrial TiOSO4 solution; template removal; ozone oxidation; extraction; multi-step calcinations