Removal of Cu²⁺ ions from aqueous solution by amino-functionalized magnetic sawdust composites

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• 作者：Wentao Gan ; Likun Gao ; Xianxu Zhan ; Jian Li
• 刊名：Wood Science and Technology
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：51
• 期：1
• 页码：207-225
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Wood Science & Technology; Ceramics, Glass, Composites, Natural Materials; Operating Procedures, Materials Treatment;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-5225
• 卷排序：51

文摘

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.