Single-step synthesis of magnetic chitosan composites and application for chromate (Cr(VI)) removal

Abstract

Magnetic chitosan composites (Fe₃O₄@chitosan) were synthesized in one single-step, characterized and applied in Cr(VI) removal from water. With the increase of loading proportion of chitosan, Cr(VI) adsorption capacity of Fe₃O₄@chitosan composites increased from 10.771 to 21.040 mg/g. The optimum adsorption capacities of Cr(VI) on Fe₃O₄@chitosan-3 were found in a pH range of 3.0−5.0. Kinetic study results show that the adsorption process follows pseudo-second-order model, indicating that the rate-limiting step in the adsorption of Cr(VI) involves chemisorptions. Moreover, FT-IR spectra analysis confirms that the amine and hydroxyl groups of chitosan are predominantly responsible for binding. Results from this work demonstrate that the prepared Fe₃O₄@chitosan composites possess great potential in Cr(VI) removal from contaminated water.

Keywords

Cr(VI) / magnetic chitosan / one single-step synthesis / adsorption

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