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Herein we report the adsorption capacity of some water-soluble dyes onto a new magnetic polymer nanocomposite [1-3].Polyacrylic acid-coated Fe3O4 nanocomposite was synthesized by dispersion polymerization of acrylic acid in supercritical carbon dioxide in the presence of surface modified magnetite nanoparticles.After immobilization of the silane-coupling agents,3-(trimethoxysilyl)propylmethacrylate,polyaerylic acid (PAA) chains were successfully grafted from the surface of Fe3O4,resulting in the formation of core-shell nanostructures.The obtained product was confirmed for chemical and physical structure using Fourier transform infrared spectroscopy (FT-IR),thermogravimetric analysis (TGA),X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM).The analysis results of magnetic property indicated that composites were superparamagnetic.The adsorption of some dyes onto the obtained nanocomposite was investigated in phosphate buffer (pH 2-10) at 25℃.It indicated that the adsorption capacity increased with the increase in solution pH and with the increase in Fe3O4 contents in composites.