In this work the chitosan/carboxymethyl cellulose (CMC) composite was modified by reacting chitosan/CMC composite with glutaraldehyde (GA) and ethylene diamine (EA) as a cross linker. The different amounts of chitosan/CMC composite as well as different volumes of distilled water were used to prepare the modified composite samples. The resultant composites were used to remove Cr (VI) from standard aqueous solution. The modified composite was characterized by the FT-IR, SEM and TGA. The optimum conditions for adsorption of Cr (VI) on modified composite were found at pH range of 2.0-4.0 and stirring time of 7 minutes. Kinetic study results showed that the adsorption process follows pseudo-second order model, while the Langmuir adsorption isotherm provide the best fit with a maximum adsorption capacity from 33.77 to 89.24 mg/g at 25oC, indicating that the rate limiting step in the absorption of Cr (VI) involves the best physical interaction physisorption. Thermodynamic parameters in TGA analysis indicated an endothermic process and spontaneous adsorption of Cr (VI) on the polymers. Results from this work demonstrated that the prepared composite possess great potential for removing Cr (VI) from contaminated or waste water.