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Adsorptive Removal of Phosphate from Aqueous Solution by Magnetic-Supported Kaolinite: Characteristics, Isotherm and Kinetic Studies

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Document pages: 20 pages

Abstract: Natural kaolin (NK) and magnetite-modified kaolin (MK) prepared by co-precipitationwere used as adsorbents to remove phosphate from aqueous solution. Thematerials were characterized using X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR),field-emission scanning electron microscope (FESEM), and vibratingsample magnetometer (VSM). Batch adsorption experiment was carried out todetermine the phosphate removal efficiencies of these materials. Themagnetic-supported kaolin showed better dispersion and less co-aggregationwhich ensured better fusion of the kaolin with magnetite (Fe3O4).The removal process of phosphate was governed by physico-chemical process. Theresults demonstrated that the adsorption of phosphate onto NK and MK was highlypH-dependent and the kinetics of the adsorption followed pseudo-second orderequation. The adsorption data of Mk adsorbent fitted better with the Freundlichisotherm equation. The MK showed much better adsorption capacity per mass of MK(52.91 mg g) than untreated NK (17.61 mg g). Since the magnetic kaolin can beeasily prepared, it enables promising application for the removal of phosphatefrom aqueous solution. Hence, this new class of efficient adsorbent (MK), canhave a variety of application in industrial processes.

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