Nanocomposites of mixed iron/aluminum oxide (Fe2O3- Al2O3) were prepared by hydrothermal method and modified with a cationic surfactant CTAB for the removal of dye (C.I Acid Orange 67). The morphology and size of the obtained nanocomposites were characterized by SEM, EDX and TEM. The resulting composite and its modified form have been characterized by using the XRD, FT-IR. Batch adsorption experiments were carried out for the removal of acid dye AO67 from aqueous solution. The adsorption of AO67 over the mixed nanocomposite and its modified form were investigated for different parameters such as the effect of CTAB concentration, effect of pH dye solution, effect of initial dye concentration, mass of the adsorbent and the contact time on the adsorption capacity. The adsorption capacities were evaluated using the Langmuir, Freundlich Dubinin- Radushkevich (D-R) and Temkin adsorption isotherm models, the equilibrium experimental data fits perfectly the Langmuir isotherm. Batch kinetic data were analyzed using pseudo first and second order kinetic models, and otherwise different kinetic models. Kinetic data of adsorption are well fitted by the pseudo 2nd order kinetic model with a good agreement with the intra-particle diffusion model. For this the prepared nanocomposite could be regarded as a potential adsorbent for AO67 removal in a wastewater treatment. and were used the optimum conditions for application in the removal of simulated wastewaters dyes (RB222, RY145 and AR37).