Preparation of Melt Derived 45S5 Bioactive Glass from Rice Hull Ash and Its Characterization

45S5 bioactive glass with chemical composition of 45 SiO₂–24.5 Na₂O–24.5 CaO–6 P₂O₅ (wt%) was synthesized through melting process using alkali extracted silica from rice hull ash, and commercial silica. Prepared bioactive glasses were characterized by incubation in simulated body fluid (SBF) to investigate their bioactivities and degradation. Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), XRD and Vickers hardness measurements were obtained for all samples before and after incubation in simulated body fluid. The results showed that 45S5 bioactive glass produced with amorphous rice hull silica has a good bioactivity, so it can be used as an alternative to commercial silica for the production of the 45S5 bioglass.