In this study, Fe₃O₄/GO/PVP (FGP) was successfully synthesized and efficiently applied for absorbing methylene blue. First, GO was synthesized by Hummer’s method from waste home-batteries. The chemical co-precipitation method was used to fabricate Fe₃O₄/GO from a mixture solution of GO, Fe₃⁺, Fe₂⁺. Polyvinylpyrrolidone PVP was selected to functionalize Fe3O4/GO and form Fe₃O₄/GO/PVP for improving dispersibility purpose in aqueous solution. The obtained Fe₃O₄/GO/PVP was characterized by XRD, FT-IR, BET, FE-SEM, UV-Vis techniques. Moreover, the effecting factors as pH, time adsorption, initial concentration of methylene blue were conducted. Adsorption isotherm models were also identified. The results showed that specific surface area of FGP-3 was 70.0 m2.g-1, the Freundlich isotherm model was suitable and the Dubinin - Radushkevich isotherm model showed that the process was physical adsorption. The maximum capacity (qmax) was 30.4 mg.g-1. These findings prove Fe₃O₄/GO/PVP as an inexpensive and efficient adsorbent for removal of cationic dyes.