抄録
High purity, nanoparticle silica (SiO2) powders were obtained by pyrolysis of rice husk treated with various types of lignocellulolytic enzymes. The rice husks were washed with distilled water, followed by mild hydrochloric acid, and then treated with the enzymes. The residue was fired at moderate temperature to burn off the hydrocarbon, and the ash was calcined in air at 600 oC for 6 h. With enzyme treatments, the final products contained more than 98% SiO2 and possessed surface area of more than 150 m2/g. A 99.9% SiO2 was obtained from the husk treated with the most active enzyme. Electron microscope studies showed average particle size of 15 nm. Without enzyme treatment, the products showed similar structure but only 90% purity was obtained.
