Extraction and Characterization of Silica from Reeds Biomass (Imperata cylindrical) in Various Annealing Temperatures

Abstract

Reeds biomass has been successfully extracted. It calcinated with annealing temperatures at 800°C (A800), 850°C (A850), and 900°C (A900). The x-ray pattern showed that it has a cristoballite (SiO2) crystal structure. The band gap energy values are 3.8 eV, 3.7 eV and 4.7 eV, respectively. FTIR spectra show the groups are silanol, siloxane, and monohydride. Quantitatively, it provides results to determine the optical properties and dielectric functions which indicate a shift to longer wavelengths with an increase in annealing temperature. The morphology presents a different image where the particles are formed flakes (A800), aggregates (A850) and porous aggregates (A900).