Synthesis of magnetite derivatives nanoparticles and their application for the removal of chromium (VI) from aqueous solutions

Lotfi Ben Tahar; Mohamed Habid Oueslati; Mustafa Jaipallah Abdelmageed Abualreish

doi:10.1016/j.jcis.2017.10.044

Synthesis of magnetite derivatives nanoparticles and their application for the removal of chromium (VI) from aqueous solutions

J Colloid Interface Sci. 2018 Feb 15:512:115-126. doi: 10.1016/j.jcis.2017.10.044. Epub 2017 Oct 12.

Authors

Lotfi Ben Tahar¹, Mohamed Habid Oueslati², Mustafa Jaipallah Abdelmageed Abualreish³

Affiliations

¹ Northern Border University, Faculty of Science of Arar, P.O. Box 1231, Arar 91431, Saudi Arabia; Tunis El Manar University, Faculty of Science of Tunis, Campus Universitaire, 2092, Tunisia; Carthage University, Faculty of Science of Bizerte, UR11ES30, Synthèse et Structures de Nanomatériaux, 7021 Jarzouna, Tunisia. Electronic address: bentaharlotfi@gmail.com.
² Northern Border University, Faculty of Science of Arar, P.O. Box 1231, Arar 91431, Saudi Arabia; Carthage University, Department of Chemistry, Preparatory Institute for Scientific and Technical Studies, P.O. Box 51, La Marsa 2070, Tunisia.
³ Northern Border University, Faculty of Science of Arar, P.O. Box 1231, Arar 91431, Saudi Arabia; Omdurman Islamic University, Department of Chemistry, Faculty of Science, Sudan.

PMID: 29055793
DOI: 10.1016/j.jcis.2017.10.044

Abstract

Nowadays there is a continuously increasing worldwide concern for the development of efficient wastewaters treatment technologies. Among the heavy metal ions, chromium holds a distinct position due to its high toxic nature to biological systems. This study aims to assess magnetite derivatives nanoparticles for the removal of Cr(VI) species. Crystalline magnetite-rich (Magn) and pure maghemite (Magh) nanoparticles were produced by the polyol method and by subsequent heat treatment of Magn, respectively. The XRD analysis confirmed the formation of nanosized single phase cubic spinels with a cell parameter of 8.3710(2)Å for Magn and 8.3401(2)Å for Magh, consistent with those of a magnetite-rich ferrite and maghemite, respectively. TEM analysis showed that the two nanoferrites possessed comparable mean particle size of ∼15nm. Magn and Magh showed superparamagnetic behavior at room temperature and reasonable saturation magnetizations at 300K of 69 and 67emu.g^-1, respectively. The Curie temperature of both nanoferrites exceeded 350°C allowing the materials to work in severe conditions. Room temperature, batch adsorption experiments of Cr(VI) onto maghemite nanoparticles were carried out at pH 2.0. Adsorption efficiency increased rapidly was the increase of the nanoparticles dose. For a 20mg.L^-1 Cr(VI) solution a 100% removal was found with ∼3g.L^-1 dose. Additionally, for a given dose (4.0g.L^-1), the adsorption rate measured as a function of time for different Cr(VI) concentrations was very rapid; ∼90% of removable Cr(VI) species was achieved within 10min. The high rate of Cr(VI) uptake takes advantages of the high active surface chemistry of the nanoparticles. The adsorption of Cr(VI) onto Magh nanoparticles followed a pseudo-second order kinetics indicating a chemisorption process. Further, the Langmuir isotherm model was found to best describe the equilibrium data with a maximum adsorption capacity of 12.5mg.g^-1 for an adsorbent dosage of 4.0g.L^-1.

Keywords: Adsorption; Chromium; Maghemite; Magnetism; Magnetite; Nanoparticles.