Separation and Recovery of Platinum by Magnetic Coreshell Nanostructures Modified with N-(2-aminoethyl)-3- aminopropyltrimethoxysilane

In this paper, fe_3o_4@sio_2 core/shell magnetic nanostructure has been synthesized and modified by n-(2-aminoethyl)-3-aminopropyltrimethoxysilane (aeaptms). fe_3o_4@sio_2 was used as a novel adsorbent for separation of hexachloroplatinic acid. x-ray diffraction (xrd), scanning electron microscopy (sem), and ft-ir technique were used to characterize morphologies and surface texturing of these adsorbents. the effective factors on adsorption, such as ph, contact time; salt effect and temperature were studied systematically. the optimal conditions of platinum adsorption were obtained at temperature of about 25 ℃, ph about 2.5 and the equilibrium time of 30-40 minutes. the maximum adsorption capacity (qmax) in the optimal conditions was equal to 74 mg/g. the magnetic separation of the absorbent was achieved by a magnet and finally the absorbent was compared with other absorbents. inductive coupled plasma optical emission spectrometer (icp-oes) was used for determination of metal ion concentrations in the aqueous solution.