Study of heteroaggregation and properties of sol-gel AlOOH-Fe3O4 composites

Vasily I Mikhaylov; Ilia S Martakov; Evgeny Yu Gerasimov; Petr A Sitnikov

doi:10.1016/j.heliyon.2020.e05825

Study of heteroaggregation and properties of sol-gel AlOOH-Fe₃O₄ composites

Heliyon. 2020 Dec 28;6(12):e05825. doi: 10.1016/j.heliyon.2020.e05825. eCollection 2020 Dec.

Authors

Vasily I Mikhaylov¹, Ilia S Martakov¹, Evgeny Yu Gerasimov², Petr A Sitnikov¹

Affiliations

¹ Institute of Chemistry, Federal Research Centre, Komi Science Centre of the Ural Branch of the Russian Academy of Sciences, 48 Pervomyaskaya Street, 167982 Syktyvkar, Russia.
² Boreskov Institute of Catalysis SB RAS, Pr. Lavrentieva 5, Novosibirsk, 630090, Russia.

Abstract

In this work, AlOOH-Fe₃O₄ powder nanocomposites for Cr(VI) adsorption were obtained for the first time using oppositely charged boehmite and citric acid modified magnetite sols. The process of heteroaggregation of oppositely charged AlOOH and Fe₃O₄ nanoparticles was also studied as one of the stages in the preparation of adsorption active material. Сomposition, surface area, porous structure, thermal and surface properties, adsorption efficiency, and regenerability of nanocomposites were investigated using a wide range of analytical methods. It is noted that a low content of magnetite (2 wt.%) in the AlOOH-Fe₃O₄ composite promotes an increase in the surface area, weakly affects the Cr(VI) adsorption capacity, and imparts magnetic properties to the composite. Low cost, simplicity of preparation, high Cr(VI) adsorption capacity (up to 21 mg/g), and stability in cyclic use are the advantages of the obtained nanocomposites in comparison with similar systems. They can easily be separated from the purified liquid using a permanent magnet due to their magnetic properties.

Keywords: Boehmite; Chromium; Composites; Heteroaggregation; Magnetite.