Silica was extracted from rice husk using acid leaching and a subsequent burning. FT-IR spectrum results of the materials generated from the rice husk burning at 650 ◦C at heat rate of 10 ◦C min−1 are shown in Figs. 1 and 2. Can be observed a strong absorption peaks correlation among the obtained materials FT-IR spectrum and commercial silica Aldrich FT-IR spectrum (Pouchert, 1985) and Tixosil, clearly indicating the presence of silica.