Adsorptive Removal of Iron Using SiO Nanoparticles Extracted from Rice Husk Ash.

In this work, SiO nanoparticles were prepared by the sol-gel method after sodium silicate was extracted from rice husk ash (RHA) under various experimental conditions such as types of acids, NaOH concentration, dissolved time, and temperature and used for removal of Fe ions from aqueous solutions. The extracted SiO was morphologically and chemically characterized and showed a surface area of 78 m/g and uniform pores of 2.71 nm, offering high adsorption capacity for Fe ions.