The FTIR spectrum of the silica particles from calcination of rice hull is shown in Figure
1b. A small band at 3440 cm-1 68 was due to the adsorbed water molecules on the surface of the
69 silica. The intensity of this band decreased when the temperature of calcination increased [7].
At 1092 cm-170 , the huge band indicated asymmetric vibration of the siloxane bond, Si-OSi,
which was the backbone of the silica. A band presenting at 800 cm-1 71 corresponded to the
72 stretching vibration of Si-O-Si bond [8]. Due to the bending vibration of the Si-O-Si bond,
the clear band was also observed at 472 cm-173 [9].