Investigation of Adsorptive Properties of Modified Sepiolite as an Efficient Magnetically Recoverable Clay for Removal of Azo Dye from Aqueous Solutions

Abstract In this research, the natural clay of sepiolite (Mg4Si6O15(OH)2·6H2O) were modified by magnetic metal oxide ofNi0.5Zn0.5Fe2O4 to obtain an efficient and magnetically recoverable adsorbent (Ni0.5Zn0.5Fe2O4/sepiolite). The synthesized adsorbent (Ni0.5Zn0.5Fe2O4/sepiolite) was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV-Vis spectroscopy, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX).In this study, the adsorption properties of the prepared sample was evaluated for the removal of Congo red (CR) dye in aqueous solution and the reusability of the sample was also investigated. The effect of initial dye concentration, pH and temperature on adsorption capacity of modified clay (Ni0.5Zn0.5Fe2O4/sepiolite) for Congo red were investigated. Also, the results of adsorption kinetic of CR dye in aqueous solution followed pseudo- first order model.

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Updated: April 28, 2018 — 1:56 am