Porous TiO2-Al2O3 Photocatalyst: The Effects of Calcination Time

Porous TiO2-Al2O3 composite materials were prepared through sol-gel method after calcination at 500 degrees C for different time. FT-IR spectra of porous TiO2-Al2O3 composite materials revealed that the samples are composed of Al2O3 and TiO2. The sample calcinated for 2.5 h had the maximum specific area of 128.9 m(2).g(-1). High pore volume and average pore size were possessed by the samples calcinated for 1 h and 3 h. While being calcinated at 500 degrees C, photocatalytic activities of the materials increased at first and then dropped down with the increasing calcination time. The sample calcinated for 3 h showed the maximum activity of 35%.