Synthesis of ordered macroporous titania using colloid as template

The ordered macroporous titania were synthesized using PMMA sphere colloid crystal as template and the Sol-Gel method. The PMMA spheres were removed by calcinations. The results showed that the sol of Ti(BuO)(4), water, ethanol and hydrochloric acid was prepared according to volume ratio of V[Ti(BuO)(4)] : V(H2O) : V(EtOH) : V(HCl) is 5 : 2 : 3 : 1 and the gelled time was 20 h in air. Set the temperature program of calcinating PMMA spheres as follows: the rate of warming temperature was 1 degrees C/min from room temperature to 250 degrees C and 2 degrees C/min from 250 degrees C to 450 degrees C, maintained it at 250 degrees C for 3 h, and at 450 degrees C for 8 h, the rate of decelerating temperature was 10 degrees C/min from 450 degrees C to room temperature.