The present research work has been carried out to assess the efficiency of nanocomposite bentonite/Fe_XO_y, coated by polyvinyl alcohol (PVP/poviden PVP), in the absorption of cation pollutants. Chemical treatment was proved by using nanocomposite bentonite/Fe_xO_y coated by polyvinyl alcohol (PVA/povidone PVP). Purified local bentonite in nano-sized model was synthesized by co-precipitation process. X-ray diffraction analysis (XRD) and other techniques have been used for the characterization of the prepared materials. The mean diameter of nanocomposite material sizes was around 31.5 nm. The presence of functional groups of polymer around a core of nano-Fe_xO_y has been confirmed. Magnetic measurements have been made with a vibrating sample magnetometer (VSM), which demonstrate the superparamagnetic nature of the nanocomposite with higher saturation magnetization, but when bentonite merged with nano-magnetite new data have been given showing relatively lower saturation magnetization than before. The purpose of work is to explain the valuability of bentonite/PVA-PVP/Fe_XO_y for adsorption of cations pollutant and its efficiency by graft polymerization of modified bentonite IONPs. The removal efficiency of five heavy metals Co, Cr, Cu, Fe, and Mn was 83.40%, 84.66%, 86.50%, 90.06% and 85.66%, respectively. Optimal conditions of nanocomposite bentonite/PVA-PVP/Fe_XO_y experiment were nanocomposite dosage at 7.5 g/L; contact time at 30 min; temperature at 50^oC and pH at 6.0.