Preparation of magnetically separable Fe3O4 @ SiO2@ FeOOH nanoparticles for effective removal of Cr (VI) from aqueous solution

Document Type : Original Article

Authors

1 Nuclear Fuel Technology Department, Hot Laboratory Center.

2 Hot Laboratories and Waste Management Centre, Egyptian Atomic Energy Authority (EAEA), P. No. 13759, Cairo, Egypt

Abstract

In this study, Fe3O4@SiO2@FeOOH has been prepared and used as an adsorbent to eradicate Cr(VI) from aqueous media. Fe3O4@SiO2@FeOOH has been characterized by various characterization methods. Various factors on chromium adsorption such as the effect of pH, temperature, adsorbent In this study, Fe3O4@SiO2@FeOOH has been prepared and used as an adsorbent to eradicate Cr(VI) from aqueous media. Fe3O4@SiO2@FeOOH has been characterized by various characterization methods. Various factors on chromium adsorption such as the effect of pH, temperature, adsorbent dose, Cr(VI) concentration, and time were studied. The reaction mechanism was determined after applying kinetic models to the adsorption process. It was found that the adsorption amount of Cr(VI) on Fe3O4@SiO2@FeOOH is 42.95 mg/g. The time to reach equilibrium for adsorption is 150 min. Also, the adsorption of Cr(VI) is found to be fitted with pseudo-second order model. The equilibrium studies showed that Cr(VI) is adsorbed according to Langmuir model. As temperature rises, the amount adsorbed does as well. The regeneration and reuse of Fe3O4@SiO2@FeO have been studied for four cycles of Cr(VI) adsorption. 0.2 M NaOH solution is the best eluent of adsorbed Cr(VI) and Fe3O4@SiO2@FeOOH regeneration. It was found that Fe3O4@SiO2@FeOOH can be used efficiently for four cycles.

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