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

来源期刊:中南大学学报(英文版)2016年第2期

论文作者:王海鹰 杨卫春 唐琼芝 董舒宇 柴立元

文章页码:317 - 323

Key words:Cr(VI); magnetic chitosan; one single-step synthesis; adsorption

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.

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