SYNTHESIS, CHARACTERIZATION OF SILICA NANOMATERIALS FROM RICE HUSK AND CeO2@SiO2 COMPOSITE APPLICATION OF ADSORPTION OF NH4 + , NO3 - IONS IN WATER ENVIRONMENT

Abstract

In this article, SiO2 material was synthesized by sol-gel method in acidic environment and CeO2 material
coated with SiO2 (CeO2@SiO2) was synthesized in alkaline environment. The structure of the powder was
characterized by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) was used to
characterize the samples. The size of SiO2 and CeO2@SiO2 materials were uniform, small and the particles
were distributed from 10 to 30 nm. The study showed that the adsorption capacity of NH4+ ions was consistent with the Langmuir adsorption isotherm model, the adsorption capacity of NO3 - was consistent with the Freundlich isotherm model. The research results showed that nano silica material made from rice husks has the ability to adsorb NH4+ and NO3- ions in aqueous environment. It is intended to be used in fertilizer products, supporting the immediate need for nitrogen for plants. 
fertilizer products, supporting the immediate need for nitrogen for plants.