Rice husk is a form of agricultural biomass that provides an abundant silicon source. This
study used rice husk as a raw material to prepare nanosilica without adding an extra
surfactant. This work investigated a dissolution–precipitation technique as a function of acid
treatment, sodium silicate concentration, gelation pH, aging temperature, and aging time to
establish optimum conditions for preparing silica nanoparticles. Experimental results
showed that silica produced by hydrochloric acid possesses higher surface area than that of …