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Advances in Environmental Research
  Volume 4, Number 2, June 2015 , pages 69-81

Functionalized magnetite / silica nanocomposite for oily wastewater treatment
Seyfollah Gilak Hakimabadi, Ali Ahmadpour, Mohammad T. Hamed Mosavian and Tahereh Rohani Bastami

    A new magnetite-silica core/shell nanocomposite (Fe3O4@nSiO2@mSiO2) was synthesized and functionalized with trimethylchlorosilane (TMCS). The prepared nanocomposite was used for the removal of diesel oil from aqueous media. The characterization of magnetite-silica nanocomposite was studied by X-ray diffraction (XRD), Fourier transform infrared (FTIR), transmission electron microscopy (TEM), surface area measurement, and vibrating sample magnetization (VSM). Results have shown that the desired structure was obtained and surface modification was successfully carried out. FTIR analysis has confirmed the presence of TMCS on the surface of magnetite silica nanocomposites. The low- angle XRD pattern of nanocomposites indicated the mesoscopic structure of silica shell. Furthermore, TEM results have shown the core/shell structure with porous silica shell. Adsorption kinetic studies indicated that the nanocomposite was able to remove 80% of the oil contaminant during 2 h and fit well with the pseudo-second order model. Equilibrium studies at room temperature showed that the experimental data fitted well with Freundlich isotherm. The magnetic property of nanocomposite facilitated the separation of solid phase from aqueous solution.
Key Words
    magnetite silica nanocomposite; core-shell; oily pollutant; adsorption; functionalized surface
(1) Seyfollah Gilak Hakimabadi, Ali Ahmadpour, Mohammad T. Hamed Mosavian, Tahereh Rohani Bastami:
Department of Chemical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;
(2) Tahereh Rohani Bastami:
Department of Chemical Engineering, Quchan University of Advanced Technology, P.O. Box Quchan, 94771-67335, Iran (Current Address).

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