| 초록 |
A thermally stable mesoporous spherical TiO2 powders with a crystalline framework, high surface area, and large pores is synthesized by a novel and simple alkoxide gel-sol method using titanyl acylate gel [Ti(OiPr)4-x(OAc)x] as a precursor in 0.15N KOH solution. XRD analysis indicates that the anatase and rutile phase were formed pH range in 12-2 and in below 2, respectively, directly at reaction temperatures in the range 15-95 ℃ and atmospheric pressure without hydrothermal process and using the block copolymer. The synthesized anatase phase is stable up to calcination temperatures of 1000℃. The highest specific surface area (BET) obtained was 250 m2/g at the reaction temperature of 55℃. When the calcination temperatures increase, the adsorption –desorption isotherm shape, according to the BDDT classification progressively and continuously goes from a type Ⅳ isotherm, characteristic of mesopores (2nm ＜ diameter ＜50), to a type Ⅱ isotherm, characteristic of macropores (diameter ＞ 50nm). |
