In this study, SiO₂ was extracted from immature rice ash (IRA) and Sugarcane bagasse ash (SBA) under various experimental circumstances, varying temperatures, amounts of NaOH, and dissolved time. Then, SiO₂ nanoparticles were created using the sol-gel method. By increasing the amount of time, the effects of the experimental circumstances are investigated. IRA and SBA were subjected to NaOH dissolution for 60, 90, 120, 150, and 180 minutes. A range of NaOH volumes 100 to 400 ml and temperatures (50 °C to 100 °C in 10 °C increments) were tested, keeping the biomass quantity constant at 10 g. Different experimental settings were used to calculate the amount of SiO₂ extracted, and optimum experimental conditions were used to perform the extraction process. The FTIR, SEM, and XRD are used to characterize the extracted SiO₂ nanoparticles. Results confirm the successful formation of high-purity SiO₂ nanoparticles, with IRA demonstrating a novel precursor source and process conditions tailored for both IRA and SBA. This work contributes to sustainable nanomaterial production by valorising underutilized agricultural waste.

Keywords: Immature rice ash, Sugarcane bagasse ash, Sol-gel method.