Abstract
Silica is derived from the diverse agricultural sources due to its extensive applications. This study reports the extraction of amorphous silica from the maize stalk cultivated in Ethiopia due to its abundant disposal, low price, and environmental impacts. Three different methods are used to extract silica and the resultant materials were characterized. The results demonstrate that the particles are in the amorphous structure and have disordered morphology with the particle attached through the grain boundary to form agglomerated structure. Reduction in the level of impurities and increment of silica content are found among the resultant materials. Besides, the occurrence of silanol and siloxane groups along with other functional groups and their variation between the products is reported. This study highlights the possible adaptation of the Ethiopian maize stalk as an alternative raw material for the production of silica and also reduces the environmental pollution caused by indiscriminate disposal of maize stalk.
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