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Preparation and characterization of amino-functionalized nano-Fe3O4 magnetic polymer adsorbents for removal of chromium(VI) ions

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Abstract

Four kinds of NH2-functionalized nano magnetic polymer adsorbents (NH2-NMPs) coupled with different diamino groups, i.e., ethylenediamine (EDA), diethylenetriamine (DETA), triethylentetramine (TETA), and tetraethylenepentamine (TEPA), named as EDA-NMPs, DETA-NMPs, TETA-NMPs, and TEPA-NMPs, respectively, have been prepared and characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), elementary analyzer (EA), Brunauer, Emmett, Teller surface area analyzer (BET), and Fourier transform infrared spectroscopy (FTIR). The sorptive characteristics of the NH2-NMPs intended for removal of chromium(VI) was investigated. Batch adsorption studies were carried out to optimize adsorption conditions. The evaluation of the adsorption kinetics, isotherm, and thermodynamics was deeply investigated. The results showed the adsorptive properties of the NH2-NMPs were highly pH dependent. Adsorption of Cr(VI) reached equilibrium within 30 min. The data of adsorption kinetics obeyed pseudo-second-order rate mechanism well. The adsorption data for Cr(VI) onto NH2-NMPs were well fitted to the Langmuir isotherm. The maximum adsorption capacities (q m) of the NH2-NMPs to Cr(VI) were 136.98, 149.25, 204.08, 370.37 mg g−1, for EDA-NMPs, DETA-NMPs, TETA-NMPs, and TEPA-NMPs, respectively. Thermodynamic parameters like ΔH θ, ΔS θ, and ΔG θ for the adsorption of Cr(VI) onto the NH2-NMPs have been estimated, which suggested that the adsorption processes of Cr(VI) onto the NH2-NMPs were endothermic and entropy favored in nature. The adsorption mechanism studies showed that the adsorption of Cr(VI) onto the NH2-NMPs could be related with electrostatic attraction, ion exchange, and coordination interactions.

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Acknowledgements

We would like to thank the Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules (2007-KL-2007), the Zhejiang Science and Technology Bureau (2007F0045) and the Ningbo Science and Technology Bureau (2009A610002) for the financial support.

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Authors and Affiliations

  1. Ningbo Institute of Technology, Zhejiang University, Ningbo, 315100, China

    Yong-Gang Zhao, Hao-Yu Shen, Sheng-Dong Pan & Mei-Qin Hu

  2. College of Science, Zhejiang University, Hangzhou, 310027, China

    Yong-Gang Zhao & Sheng-Dong Pan

  3. Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China

    Qing-Hua Xia

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  1. Yong-Gang Zhao
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  2. Hao-Yu Shen
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  3. Sheng-Dong Pan
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  4. Mei-Qin Hu
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Correspondence to Hao-Yu Shen.

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Zhao, YG., Shen, HY., Pan, SD. et al. Preparation and characterization of amino-functionalized nano-Fe3O4 magnetic polymer adsorbents for removal of chromium(VI) ions. J Mater Sci 45, 5291–5301 (2010). https://doi.org/10.1007/s10853-010-4574-5

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