In this research, clay was modified by MgFe 2 O 4 nanoparticles and was then used to remove Cr (VI) from aqueous media. The properties of the composite were characterized by several analyses such as Scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and Energy dispersive Xray (EDX). According to the BET analysis, specific surface area and mean pores size for the clay/MgFe 2 O 4 composite were obtained 71.23 m 2 /g and 96.14°A, respectively, which illustrates that the aforementioned composite had a mesoporous structure. Also, the XRD analysis indicated that the clay/ MgFe 2 O 4 composite had a highly crystalline structure. Moreover, the sorption results indicated that the highest removal efficiency of Cr (VI) ion was obtained 96.05% after 15 min and pH value of 4.5. Furthermore, the maximum sorption capacity by the Langmuir model was determined 217.39 mg/g, which was a significant sorption capacity. Moreover, the reusability of the composite was studied after 8 cycles and the results showed that the composite could remove Cr (VI) with a removal efficiency of 94.55% after 4 times reusing the composite, which indicated a significant property of the adsorbent. Furthermore, the Langmuir isotherm was better fitted with the experimental data. Besides, the thermodynamic study indicated that the sorption of Cr (VI) using the clay/ MgFe 2 O 4 was feasible, spontaneous and endothermic.
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