The purpose of this study was to remove Cr3+ ions from polluted water using AC@Fe3O4@SDS nanocomposite. The physical and surface features of the nanocomposite were investigated with EDS, DLS, XRD, BET, FTIR, SEM and TEM analyses. The BET surface area and the mean pore diameter of the AC@Fe3O4@SDS were 102.04 m2/g and 169.49 oA, respectively, indicating the high porosity of the aforementioned nanocomposite. DLS and XRD analyses showed that the mean particle size and mean crystal size of AC@Fe3O4@SDS were 78.9 nm and 28 nm, respectively. Also, the highest Cr3+ removal efficiency (99.5%) using the AC@Fe3O4@SDS nanocomposite was obtaind at pH= 7, contact time= 40 min, temperature= 55 ºC, the Cr3+ ion concentration= 10 mg/L and the nanocomposite dosage= 2 g/L, which is the highest Cr3+ removal efficiency ever achieved. Moreover, the utmost sorption capacity obtained from the Langmuir model was 120.48 mg/g, which is a significant value compared to previous studies for Cr3+ removal. Furthermore, the isotherm and kinetic studies of the sorption process indicated that the Cr3+ sorption process using the aforementioned nanocomposite followed the quasi-second order and Freundlich equations due to higher correlation coefficients. Subsequently, the thermodynamic study demonstrated that the sorption process of Cr3+ ions using AC@Fe3O4@SDS is favorable, feasible, spontaneous and endothermic.