Patent ID: 8852548

Claim:
A method of preparing high crystalline nanoporous titanium dioxide, the method comprising: (a) mixing a titanium precursor and a surfactant in a solvent and performing a sol-gel reaction at a room temperature; (b) maturing a reactant obtained through the sol-gel reaction at the room temperature; (c) filtering the matured reactant and washing the matured reactant; (d) drying the washed reactant to obtain titanium dioxide having nanopores; and (e) mixing the titanium dioxide with distilled water and applying ultrasound to the mixed solution for 10 min to 40 min to give the titanium dioxide a specific surface area of 400 m 2 /g to 600 m 2 /g and a mean diameter of wormhole-like nanopores of 1 nm to 3 nm, the ultrasound having an energy level of 15 KHz to 30 KHz and 90 W to about 110 W.