This article studies on the synthesis of chitosan – magnetite composite materials (CM) by in-situ method. The composite materials were synthesized in mass ratio chitosan: magnetite from 9:1 to 4:6. The characterization of CM composites were determined by XRD and SEM methods showed that the crystal size and material surface depend on the proportion of chitosan added during the synthesis. These materials were able to removal CFX antibiotics in aqueous by adsorption method. The CM46 composite adsorbed well CFX with equilibrium time of 60 minutes. The adsorption of CFX onto CM46 followed the Langmuir and Freundlich adsorption model. The maximum adsorption capacity was 53.25 mg/g. The kinetic of the removal fitted better to the pseudo-second-order.

The chitosan/mangetite composite in the mass ratio chitosan:mangetite of 9:1 (CM91) was synthesised by co-precipitation method. The characteristics of the chitosan/mangetite composite was estimated by X-ray diffraction method (XRD) and scanning electron microscopy techniques (SEM). The methylene blue adsorption ability onto CM91 composite was well at value pH 9, equilibrium contact time of 20 minutes. The experimental adsorption data fitted into pseudo–Langmuir adsorption isotherm models. The adsorption followed pseudo-second order kinetic model very well. The maximum adsorption capacity of that composite which caculated by Langmuir equation was 94,18 mg/g.