Herein, a precipitation approach was utilized to extract the natural silica from the corn cob and corn stems ash. The ash was burnt in the furnace at 800
๐C
and the precipitant was obtained at pH 10 in NH3
solution. The extracted silica from corn cob and corn stem ash was characterized by FT-IR and XRD. It
was found that the yield (% per 1 gram of ash) of extracted product from corn cob ash provided higher amount than that of corn stems ash. The XRD
pattern confirmed the low-crystalline nature similarly to Silica in the form of Quartz and Cristobalite with the contamination of Na2
SO4
. The FT-IR spectra
of the products showed the major characteristic of SiO2
in the stretching and bending vibration modes of Si-O and O-Si-O (at 1070 cm
-1 and 970 cm
-1
for
corn cob ash) and (at 1048 cm-1
for corn stems ash), respectively. The spectra at 2320 cm
-1 belongs to Si-H and the spectra around 1480 cm
-1
is due to the
bending of the O-H bond from the silinol group (Si-OH) is caused by the adsorbed moisture on the silica surface. It could be said that the precipitation was
a feasible approach to synthesis the silica from the agro-residue corn and this method can increase the value of the product from agroindustrial waste.