2.2. Preparation of adsorbentsMesop

2.2. Preparation of adsorbents
Mesoporous aluminosilicates were synthesized by the sol–gelbased
inverse micelle method. Tetraethylorthosilicate (0.02 mol)
and aluminum nitrate (Si:Al = 5, 10, and 20 molar ratio) were dissolved
in a solution containing 0.188 mol (14 g) of 1-butanol,
0.022 mol (2 g) of HNO3, and 2 g of P123 surfactant at room
temperature under magnetic stirring. Then, the obtained clear gel
was placed in an oven at 120
C for 4 h. Lastly, the obtained transparent
yellow film was placed in a calcination cuvette and calcined
in air at 550
C for 4 h at the heating rates of 1
C/min, 5
C/min,
and 10
C/min. The samples were taken out of the furnace right
after 4 h calcination. A constant heating rate of 2
C/min and a constant
Si:Al ratio of 5 were maintained when different aluminum
dopant amounts and different calcination heating rates were studied,
respectively. The mesoporous aluminosilicates synthesized by
this sol–gel based inverse micelle method are nanoparticle aggregations
[32].