In this study, the composite of chitosan modified (Oxidation) for the elimination of orange from aqueous solutions. In order to clarify the adsorption process, batch experiments were carried out to study the effect of the operating parameters on the adsorption process such as: the dose of adsorbent (0.5-2 g/L), the initial concentration in orange (5-100 mg/L), and the temperature (25-45°C) were studied. To describe the adsorption equilibrium, the experimental data were analyzed by the Langmuir isotherm and the Freundlich isotherm. The equilibrium is perfectly described by the Freundlich model, the correlation coefficient of which is greater than 0.99. Thermodynamic parameters such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were also evaluated and they showed that the adsorption process was spontaneously feasible and endothermic in nature. The results of the present study show that this composite can be advantageously used as a low-cost biosorbent for the removal of orange 2 from water and wastewater