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In this study powder activated carbon (PAC) and Fe3O4 magnetic nanoparticles were combined by using co-precipitation method to preparation of magnetic nanoparticles Fe3O4-activated carbon (Fe3O4-AC MNPs) as an adsorbent for removal of aniline from wastewater. Physical characteristic properties of adsorbent were analyzed by SEM, TEM, XRD and BET. Also, the effect of various parameters such as pH, contact time, adsorbent dosage, initial aniline concentration and solution temperature were investigated. The experimental data considered by Langmuir and Freundlich adsorption isotherms and two models kinetically of pseudo first-order and pseudo second-order. The results showed that the adsorption followed Langmuir and pseudo second-order models. According to Langmuir isotherm, the maximum adsorption capacity was 90.91 mg/g at pH 6, and adsorbent (magnetic activated carbon) due to have …