Fig. 4 shows FTIR spectrum in the region of 4000-400 cm-1
for the sample of bagasse ash and sodium silicate prepared
from silica source extracted at 800°C for 3 hours. The peaks
at 466 are assigned to Si-O bending, 791 cm-1 and 1090 cm-1
from vibration in symmetric and asymmetric of ←OT→← O
stretching (T=Si, Al) functional group in tetrahedral
arrangement, respectively [7]. Absorbed water bonding and
Si-OH are shown at 3000 cm-