PREPARATION AND ADSORPTION PROPERTIES OF CHITOSAN/SILICA/Fe3O4 NANOCOMPOSITE

摘要

Chitosan-based nanocomposites have been developed to promote the adsorption of water pollutants. In the current work, a chitosan/silica (CS) hybrid was employed as support for the immobilization of iron oxide nanoparticles (Fe3O4) to form a chitosan/silica/Fe3O4 (CS/Fe3O4) nanocomposite. The chitosan, CS and CS/Fe3O4 materials were examined by FTIR, XRD, TGA, SEM and TEM analyses. Uniform spherical magnetic nanoparticles of similar to 20 nm were formed. The effect of the iron oxide formation on the adsorption capacity and COD reduction of methylene blue (MB) was calculated. The best interpretation for the equilibrium data was given by the Langmuir isotherm, and the maximum adsorption capacity reached 285 mg/g. The CS/Fe3O4 nanocomposite displayed higher adsorption capacity in a slightly basic medium. This article proposes the CS/Fe3O4 nanocomposite as a new adsorbent for the removal of organic dyes from wastewater.