Amino-functionalized silica magnetite nanoparticles (A-S-MNPs) have been prepared through coating of sono-synthesized magnetite nanoparticles (MNPs) in a basic medium by SiO2. Then, the resultant silica magnetite nanoparticles (S-MNPs) were modified with 3-aminpropyltriethoxysilane (APTES). The modification was carried outby the organic solvent method in dry hexane to graft amine groups on the surface. Characterization of A-S-MNPs was investigated by FTIR spectrum, XRD, elemental analysis, TGA/DTA and ninhydrin test techniques.The adsorption behavior of this novel magnetic sorbent was studied for the simultaneous removal of two organic pollutants containingthe sulfonate group, e.g., Reactive Black 5 (RB5) and sodium dodecylbenzenesulfonate (SDBS) in aqueous solutions.The results show that a pseudo-second-order model fits well the experimental data and the rate constantof adsorption for SDBS is higher than for RB5. The adsorption capacity was obtained bythe Langmuir isotherm. The qmax was 83.33 and 62.5 mg/g for RB5 and SDBS at pH 2 and 298 K, respectively.Furthermore,the loaded A-S-MNPs can be recoveredeasilyfrom aqueous solution by magnetic separation and regenerated by simply washing with 0.1 M NaOH solution. Therefore, the synthesizednovel magnetic sorbent can be used as an effective and recyclable adsorbentfor the simultaneous removal of dye and surfactant from aqueous solutions.

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