The Surface Functionalization of Fe₃O₄ Nanoparticles by CTAB as Adsorbent for Methyl Orange Elimination in Water

Adsorption is the most extensively used technique for elimination of dye in contaminant water. Magnetically separation of toxic pollutant is becoming a potential method for water purification and obtained more effective and simple compared to conventional method of treatment. The surface-functionalized magnetic iron oxide nanoparticles with cetyl trimethyl ammonium bromide (CTAB-coated CTAB) has been investigated. CTAB-coated Fe₃O₄ were synthesized by precipitation of ferrous/ferric chloride (mole ratio 2:1) in CTAB/ammonium hydroxide solution mixture. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption-desorption isothermal and Fourier transforms infrared spectroscopy. The CTAB-coated Fe₃O₄ nanoparticles exhibited ability significantly to eliminate methyl orange in water compared to uncoated Fe₃O₄. Dye adsorption equilibrium state data were fitted well to the Langmuir isotherm were obtained the favorable of constant separation factor value (RL) (0.005-0.03). The CTAB coated Fe₃O₄ followed the pseudo-second-order kinetic model, resulting in the rate constant adsorption value for the elimination of methyl orange was 0.0694 g.mg^-1.h^-1. CTAB coated Fe₃O₄ nanoparticles have relatively high saturation magnetization, which allowed their highly-efficient magnetic separation from wastewater. This investigation was concluded than CTAB-coated Fe₃O₄ nanoparticles was efficient to eliminate dye from wastewater (paper)