Abstract

Macroporous TiO 2 microspheres have been synthesized on a large scale by a facile hydrothermal process using titanium tetrachloride (TiCl 4) as the titanium source, ammonium fluoride (NH 4F) and hydrogen peroxide (H 2O 2) as the etchant. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) studies show that the anatase TiO 2 microspheres are well-crystalline with an average diameter of 5.43 μm. N 2 adsorption–desorption and mercury intrusion porosimetry analysis reveal that the as-prepared TiO 2 microspheres are composed of numerous pore networks with an average pore diameter of 274 nm and porosity of 39.8%. In addition, the formation mechanisms of macroporous TiO 2 microspheres were also investigated.

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