Table 1: Textural and structural parameters of mesoporous TiO2 samples prepared with different amounts of urea.

Urea (mmol)PhaseCrystallite sizea  
(nm)
BET surface areab  
(m2/g)
Pore volumec  
(cm3/g)
Average pore diameterd  
(nm)

8Anatase12.21.090.0023.5
12Anatase10.457.350.0855.6
16Anatase9.242.450.0453.8
20Anatase8.73.760.0154.3

Crystallite size was calculated from the Scherrer equation based on the diffraction peak (101). bThe specific surface area was calculated by BET method. cThe total pore volume is taken from the adsorption branch of the nitrogen isotherm curve. dThe average pore diameter is estimated using the adsorption branch of the isotherm and BJH model.