Abstract
In this study, amino-functionalized magnetic γ-Fe2O3/sawdust composites (MSC-NH2) were investigated as biological absorption materials for removing Cu2+ ions from aqueous solution. These composites were fabricated by precipitated γ-Fe2O3 nanoparticles on sawdust substrate and then functionalized with 1,6-hexanediamine. Characterization of MSC-NH2 was performed by means of SEM, TEM, XRD, FTIR, BET, MPMS and XPS analysis to discuss the uptake mechanism. As a result, the amino groups are grafted upon the sawdust surfaces. The MSC-NH2 could be effectively used to remove Cu2+ from aqueous solution and be separated conveniently from the solution with the help of an external magnet. Batch experiments show that the adsorption equilibrium is achieved in 150 min, and the adsorption capacity is 7.55 mg/g at pH 6 and room temperature. The isotherm analysis indicates that the sorption data could be represented by Langmuir isotherm models. The kinetics is evaluated utilizing the Lagergren pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. Thermodynamic parameters reveal the spontaneous, endothermic and chemical nature of adsorption.
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This work was financially supported by the National Natural Science Foundation of China (Grant No. 31470584).
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Gan, W., Gao, L., Zhan, X. et al. Removal of Cu2+ ions from aqueous solution by amino-functionalized magnetic sawdust composites. Wood Sci Technol 51, 207–225 (2017). https://doi.org/10.1007/s00226-016-0864-7
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DOI: https://doi.org/10.1007/s00226-016-0864-7