The aim of this study is to prepare mesoporous TiO2 from high specific surface area nanosheets by simple
hydrothermal method at 120 ºC of 12 h using autoclave unit (Thai made). The shape, size by TEM,
crystalline structure by XRD, BET-specific surface area and photocatalytic activity of the prepared
samples were investigated. The XRD result revealed that the prepared nanosheets were amorphous phase.
The specific surface area, average pore diameter and pore volume were 360.28 m2/g, 3-5 nm and 0.275
cm3/g, respectively. The crystalline structure of calcined nanosheets at 300-600 ºC was anatase TiO2 with
decreasing in the specific surface area. The intensity of anatase TiO2 structure increased when the
calcination temperature was increased. Moreover, the photocatalytic activity of the calcined nanosheets
was higher than those of the as-synthesized nanosheets and commercial nano TiO2 (P-25, JRC-01, JRC-
03). This preparation method provided a simple routh to fabricate high photocatalyst mesoporous TiO2
using autoclave unit (Thai made)