Study on Adsorption Properties of Cd2+ by Fe3O4 Composite Materials
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Graphical Abstract
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Abstract
The Fe3O4 is prepared by coprecipitation under the alkaline conditions, and then the Fe3O4 composite materials (Fe3O4-SiO2-NH2) are synthesized with tetraethyl orthosilicate and diethylenetriamine as the main raw materials. FT-IR, VSM and SEM are employed to characterize their structures, and the adsorption performance of Cd2+ by Fe3O4-SiO2-NH2 composites are studied. The results showed that under the conditions of T=55℃, contact time of 60 min, an initial Cd2+ concentration of 100 mg·L-1 and an amount of Fe3O4-SiO2-NH2 composite of 0.1 g, the adsorbent capacity of the composite for Cd2+ is found to be 71.4 mg·g-1. The adsorption kinetic behavior of Fe3O4-SiO2-NH2 composites for Cd2+ is consistent with the quasi second-order kinetic and thermodynamics is suitable to be described by Langmuir isothermal adsorption model. The removal rate of Cd2+ is still above 70% after five times regeneration of Fe3O4-SiO2-NH2 composite materials.
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