Preparation of Ti/B binary oxides by sol-gel method and their photocatalytic activity for stoichiometric H_2O decomposition

摘要

A titanium-boron binary oxide has been prepared by the sol-gel method and characterized using SEM, TEM, UV-VIS reflectance, and X-ray diffraction psectroscopies. These measurements indicated that the obtained Ti/B gel with no treatment exhibited an amorphous structure. After clcination in O_2, the crystalline structure of titanium oxide species in the Ti/B binary oxide was changed while boron oxide species maintained in the state of amorphous. Titanium oxide species in the Ti/B binary xoide calcined at 673 K showed an anatase phase of TiO_2, and changed with the calcination temperatures from anatase phase to rutile phase. The Pt loaded Ti/B photocatalysts in aqueous suspension system decomposed water stoichiometrically under UV- irradiation. Their photocatalytic activities decreased with increasing the calcination temperature, indicating the photocatalytic activities of the Ti/B binary oxides were depended on the crystal phase of titanium oxide in the Ti/B photocatalysts.