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Rice husk ash and bagasse ash were agricultural wastes that provide an abundance of the silica (SiO2) source and the chicken eggshells and duck eggshells were important sources for calcium oxide (CaO). Therefore, in this study the rice husk ash and bagasse ash were used as raw materials for synthesis of silica powder, while chicken eggshells and duck eggshells were synthesized for the calcium oxide. The results from the XRD pattern clearly showed the structural formation of amorphous SiO2 and CaO phase. While the FTIR results indicated that the spectrums which displayed the characteristic peaks of the functional groups presenting in the SiO2 and CaO powder. However, the SEM images revealed that the particles agglomerated, various sizes and the particle size were found to be in micron level.

Preparation and Characterization of Amorphous Silica and Calcium Oxide from Agricultural Wastes