Preparation of Fe3O4@SiO2@chitosan for the adsorption of malachite green dye

Abstract

A novel magnetic adsorbent with chitosan-modified Fe3O4@SiO2 nanoparticles were prepared for the removal of malachite green in aqueous solution. Fe3O4@SiO2@chitosan was characterized by DLS and TEM. The difference among Fe3O4@SiO2@chitosan, Fe3O4@SiO2 and Fe3O4@SiO2-NH2 on the adsorption effect of malachite green was studied. The results were determined with ultraviolet spectrophotometry. Fe3O4@SiO2@chitosan showed higher efficiency on the adsorption of malachite green compared with Fe3O4@SiO2 and Fe3O4@SiO2-NH2. The removal efficiency of malachite green was 92% by Fe3O4@SiO2@chitosan, while that of Fe3O4@SiO2 and Fe3O4@SiO2-NH2 were 60% and 85%.