In this study, a new amidoximated adsorbent based on waste polypropylene (PP) fabric was prepared for the adsorption of aqueous Cr (VI) metal ions. Pre-irradiation technique was employed for grafting of acrylonitrile (AN) on PP fabric. The grafting reaction was carried out at 80oC in a water bath for 4 hours utilizing sulfuric acid (2% of AN) as additive and the percentage of grafting obtained was 150% using 60% AN concentration and 30 kGy radiation dose. The amidoximated adsorbent was produced by treating acrylonitrile (AN) grafted PP (AN-g-PP) with NH2OH.HCl and characterized by FTIR, SEM, TGA and DMA. The removal of Cr (VI) was examined under several conditions such as contact time, pH, temperature, initial Cr (VI) concentration. The equilibrium adsorption data were fitted to both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the adsorbent was found to be 232.56 mg/g calculated from Langmuir equation. Kinetic studies have exhibited that the highest removal was achieved after 40 hours that was 126.82 mg/g at pH 1.5 and Cr (VI) concentration 120 ppm. The kinetic data follow the pseudo-first order model having a good agreement between the experimental and calculated adsorption capacity. The thermodynamic data showed that the sorption process was endothermic and spontaneous taking place by increasing the randomness of the system. Furthermore, study of desorption of Cr (VI) from the adsorbent surface and reuse of the adsorbent indicate that the adsorbent can be applied effectively for the efficient removal of Cr (VI) ions from aqueous solution.