REMOVAL OF RHODAMINE B DYE FROM AQUEOUS SOLUTION USING CHITOSAN – MAGNETITE COMPOSITE

Abstract

Chitosan-magnetite composite (CS-MNPs) was made by an in-situ combined co-precipitation method. Material characteristics were investigated by X-ray, SEM, BET, and VSM methods. CS-MNPs has a spherical shape with a diameter of around 20 nm and a surface area of 119.43 m²/g. Magnetic characteristic of the CS-MNPs has a good saturation magnetization of 36.5 emu/g. Adsorption of Rhodamine B dye (RhB) was studied through parameters such as solution pH, contact time, initial RhB concentration, and temperature. RhB adsorption kinetics onto CS-MNPs was described using a pseudo-second-order model. Adsorption isotherms were in agreement with Langmuir and Freundlich adsorption models. Maximum adsorption capacity decreased from 271.79 to 148.41 mg/g when temperature raised from 293 to 313K. Adsorption process is spontaneous, random and endothermic.